Listen AmpConnect 621 USB Controlled Multichannel Test Interface User Manual

AmpConnect 621 USB Controlled Multichannel Test Interface

Product Information: AmpConnect 621TM

The AmpConnect 621TM is a product manufactured by LISTEN, Inc.
It is designed to be used as an audio interface for test and
measurement applications. The product has front panel indicators
and back panel connections for easy installation and use. It
supports USB control via SoundCheck software and digital I/O
operation. The AmpConnect 621TM comes with a limited warranty
provided by the manufacturer.

Front Panel Indicators:

• Power LED
• USB LED
• Sync LED
• Status LEDs for channels 1-6

Back Panel Connections:

• Six XLR-3 balanced line level inputs
• Six BNC digital outputs
• USB Type-B port
• DB-9 connector for digital I/O
• IEC power connector

Requirements:

The AmpConnect 621TM requires a Windows PC with a USB Type-A
port, running SoundCheck software version 11 or later. It also
requires an AC power source.

Installation:

1. Connect the XLR-3 inputs to the audio source.

2. Connect the BNC digital outputs to the measuring
   equipment.

3. Connect the USB Type-B port to the PC.

4. Connect the DB-9 connector to the digital I/O device.

5. Connect the IEC power connector to the AC power source.

6. Install SoundCheck software version 11 or later on the PC.

Usage:

1. Ensure that the AmpConnect 621TM is properly connected and the
   AC power source is turned on.

2. Launch the SoundCheck software on the PC.

3. Select the AmpConnect 621TM as the audio interface device in
   the SoundCheck software.

4. Configure the input and output settings in the SoundCheck
   software.

5. Start the test measurement procedure using the SoundCheck
   software.

6. Monitor the front panel indicators and the SoundCheck software
   for any errors or issues.

Note: Always refer to the user manual for detailed instructions
and safety precautions.

PN: 8072 Rev 042622 AMPCONNECT 621 USER MANUAL © COPYRIGHT 2020 – 2021 LISTEN, INC.

Rev 042622

CCoontenntstents
Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
Limited Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Front Panel Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Back Panel Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 System Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Test Connections and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Microphone Array – Power Averaging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Single Loudspeaker Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Two Loudspeaker Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Microphone Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Hardware and Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SoundCheck Hardware Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Latency Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 AmpConnect 621 Hardware Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Listen Hardware Tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 SoundCheck Calibration Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Self Test Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Amplifier Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Microphone Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
AmpConnect 621 Message Step . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
USB Control Via SoundCheck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
AmpConnect 621 Message Step . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Digital I/O Message Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Digital I/O Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Digital I/O Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Digital I/O Write Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Digital I/O Read Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

AmpConnect 621TM Instruction Manual

Contents

i

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Equipment Ratings and Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 CE Declaration of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Important Safety Precautions And Symbol Explanations . . . . . . . . . . . . . . . . . . . 43 Vigtige Sikkerhedsforskrifter Og Symbolforklaringer . . . . . . . . . . . . . . . . . . . . . . 45 Explications Importantes des Symboles et des Précautions de Sécurité . . . . . . 47 Wichtige Sicherheitsvorkehrungen und Symbol- erklärungen . . . . . . . . . . . . . . . 49 Información de Seguridad y Símbolos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Listen Software License Agreement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

ii

Contents

AmpConnect 621TM Instruction Manual

Limited Warranty
LISTEN, Inc., a Massachusetts Corporation, having its principal place of business at 580 Harrison Ave, Suite 3W, Boston, MA 02118 (Manufacturer) warrants its AmpConnect 621TM products (the Products) as follows:
1. Limited Warranty. Manufacturer warrants that the Products sold hereunder will be free from defects in material and workmanship for a period of one (1) year from the date of purchase. If the Products do not conform to this Limited Warranty during the warranty period (as herein above specified), Buyer shall notify Manufacturer in writing of the claimed defects and demonstrate to Manufacturer satisfaction that said defects are covered by this Limited Warranty. If the defects are properly reported to Manufacturer within the warranty period, and the defects are of such type and nature as to be covered by this warranty, Manufacturer shall, at its own expense, furnish, replacement Products or, at Manufacturer’s option, replacement parts for the defective Products. Shipping of the replacement Products or replacement parts shall be at Buyer’s expense.
2. Other Limits. THE FOREGOING IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Manufacturer does not warrant against damages or defects arising out of improper or abnormal use of handling of the Products; against defects or damages arising from improper installation (where installation is by persons other than Manufacturer), against defects in products or components not manufactured by Manufacturer, or against damages resulting from such non-Manufacturer made products or components. Manufacturer passes on to Buyer the warranty it received (if any) from the maker thereof of such non-Manufacturer made products or components. This warranty also does not apply to Products upon which repairs have been effected or attempted by persons other than pursuant to written authorization by Manufacturer.
3. Exclusive Obligation. THIS WARRANTY IS EXCLUSIVE. The sole and exclusive obligation of Manufacturer shall be to repair or replace the defective Products in the manner and for the period provided above. Manufacturer shall not have any other obligation with respect to the Products or any part thereof, whether based on contract, tort, strict liability or otherwise. Under no circumstances, whether based on this Limited Warranty or otherwise, shall Manufacturer be liable for incidental, special, or consequential damages.
4. Other Statements. Manufacturer’s employees or representatives’ ORAL OR OTHER WRITTEN STATEMENTS DO NOT CONSTITUTE WARRANTIES, shall not be relied upon by Buyer, and are not a part of the contract for sale or this limited warranty.
5. Entire Obligation. This Limited Warranty states the entire obligation of Manufacturer with respect to the Products. If any part of this Limited Warranty is determined to be void or illegal, the remainder shall remain in full force and effect.

AmpConnect 621TM Manual

Limited Warranty

iii

page intentionally left blank

iv

Limited Warranty

AmpConnect 621TM Manual

Product Overview
AmpConnect 621TM simplifies your multichannel audio test in a single USB- connected unit. With sample rates up to 192kHz, it is ideal for the measurement of high resolution audio devices.
6 inputs with independent control of microphone power for each channel 2 Line Outputs Single amplifier output with switchable binding posts Unique high accuracy impedance measurement independent of your input channels Digital I/O Plug-and-play setup with SoundCheck and TEDS support Error-free operation with all control via SoundCheck – no buttons! Clear visual level indications on front panel Excellent ground loop immunity compared to discrete components Rugged and rack-mountable for demanding production environments

AmpConnect 621TM Manual

Product Overview

1

Front Panel Indicators

AmpConnect 621 must be connected to a computer running SoundCheck as all control and audio interface functions are made via the USB 2.0 (minimum) connection.

Input and Output Levels · Indicator turns Green when level is > -50 dBFS
· Indicator turns Yellow when level is -6 dBFS
· Indicator turns Red when level is -1 dBFS

Output Enabled · Shows the status of the back panel amp
binding posts
· Green indicates active

Power

Input Levels

1

3

5

2

4

6

Output Levels
1 2

Amplifier

Output Enabled

Level

A B

AmpConnect 621TM

Figure 1-1: Front Panel

Level – Monitors the peak signal level and state of the amplifier output (All values are nominal) · Green indicates amplifier output level is >45 mVrms
· Yellow indicates amplifier output level is >13Vrms Error Indicator – A blinking red Level LED indicates that the amplifier has shut off due to an over-temperature or over-current event. The unit needs to be power-cycled to clear the error state.

When Inputs 1 through 6 are routed to the internal audio interface channels the front panel level indicators show the signal state at those inputs. This gives you a visual indication to show if the input is overloaded or underloaded (low signal level that is too close to the noise floor of the system).
See AmpConnect 621 Message Step on page 21. Also see Max FSD In in the SoundCheck manual.

Back Panel Connections

Inputs
· Six Inputs, Single Ended BNC connectors

Outputs
· Two Outputs, Single Ended BNC connectors

Amplifier
· Mono power amp can be switched to either Output A, Output B, A and B or Toggle Outputs

Input 1

Input 3

Input 5

Output 1

Input 2

Input 4

Input 6

Output 2

AmpConnect 621TM Listen, Inc. Made in U.S.A. Serial No.
Figure 1-2: Back Panel

Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 +3.3V Ret.

Amplifier Output

A+

B+

A-

B-

Input: 110-240V~ 50 /60Hz 200W Fuse: T2.5A

Chassis GND

Digital I/O

USB 2.0

CAUTION: RISK OF ELECTRICAL SHOCK ­ DO NOT OPEN
ATTENTION: RISQUE DE CHOC ÉLECTRIQUE ­
NE PAS OUFRIR
CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER. NO USER- SERVICABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

Digital I/O · send or receive signals with external devices
· See Digital I/O Operation on page 27

Saved State: The state of AmpConnect 621 is saved every 30 seconds. This allows the device to power on in it’s last used state. Note that this will be overwritten by Hardware Startup Defaults set in the System Hardware.

2

Product Overview

AmpConnect 621TM Manual

Installation
Requirements
SoundCheck 18.1 (or later) is required in order to control AmpConnect 621TM via USB The SoundCheck computer must have an available USB 2.0 connection
Note: It is recommended that AmpConnect 621 be mounted in a ventilated rack mount enclosure for proper cooling.

USB Connections
AmpConnect 621 should be connected directly to the SoundCheck host computer USB Port. High quality, powered USB 3 and USB-C hubs may work but should be tested for stability with AmpConnect 621. The use of USB 2 hubs should be avoided.

Physical Installation

Caution!

Airflow around the heat sink must remain unobstructed during use. DO NOT install AmpConnect 621 inside an enclosure without a ventilation fan. When installed in a rack, AmpConnect 621 units should not be installed on top of each other. Leave airspace for cooling.

Power Requirements: 100-240 VAC, 50 or 60 Hz, 140W Fuse: Requires 2: T2.0A, 250V 5×20 mm Time Lag glass fuses. Suggested replacement: Eaton/ Bussman BK/S506-2.0-R
Connecting AmpConnect 621 to the AC mains supply AmpConnect 621 must be connected to a 50 or 60 Hz AC mains supply, with an operating voltage within 100 to 240 Vrms. The mains supply is connected to your AmpConnect 621 via the power entry module located on the back panel. A 3-wire grounded power cord is supplied.
Ground the Instrument
Warning! A grounding-type power plug is included with AmpConnect 621. The chassis and cover must be connected to an electrical ground to minimize shock hazard. The ground pin must be firmly connected to an electrical ground (safety ground) terminal at the power outlet. Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury.
Install SoundCheck first! Before connecting AmpConnect 621 with the provided USB cable to the SoundCheck host computer, SoundCheck must be installed. The AmpConnect 621 ASIO driver installation is part of the SoundCheck software install process.
Windows will indicate that new hardware has been found, which shows that the driver has been successfully installed. This may be displayed as “AmpConnect 621” or as “New HID Device”.

AmpConnect 621TM Manual

Installation

3

System Settings
The following settings are recommended to prevent Windows system sounds from inadvertently playing through a device under test or artificial mouth. A transducer could be damaged by loud system sounds.

Windows Audio Devices
1. Click Start and type “Manage Audio Devices” in the search bar and select Manage Audio Devices

3. Select the Recording tab and set the default recording device to the motherboard sound card or any other device that is not part of the measurement system

2. Click the Sounds tab and set the Sound Scheme to No Sounds

4. Select the Playback tab and set the default Windows playback device to the motherboard audio interface or any other device that is not part of the measurement system

5. Click OK and close the remaining Control Panel windows
Note: For more information on computer system setup please refer to the main SoundCheck instruction manual.

4

Installation

AmpConnect 621TM Manual

Test Connections and Procedures

Microphone Array – Power Averaging
To SoundCheck PC USB Connection

In pu t 1

In pu t 3

In pu t 2

In pu t 4

AmpCon n ect 6 2 1TM Listen , Inc. Made in U .S.A. Serial No.

In pu t5

Ou t pu t 1

In pu t6

Ou t pu t 2

A mplifier Output

A+

B+

A-

B-

Chassis G ND

B it 0 B it 1 B it 2 B it 3 B it 4 B it 5 B it 6 B it 7 + 3. 3V R e t.

Digital I/O

USB 2.0

SCM Ref Mic 6

SCM Ref Mic 5 SCM Ref Mic 4

SCM Ref Mic 3

SCM Ref Mic 2

SCM Ref Mic 1

Figure 3-1: 6 Microphone Array

Input : 110 -240 V ~ 50 / 60 Hz 200 W Fuse: T 2.5A
CAUTION: RISK OFELECTRICALSHOCK ­ DONOT OPEN ATTENTION: RISQUE DE CHOC ÉLECTRIQUE­ NE PAS OUFRIR
CAUTION: TO REDUCE THE RISK OFELECTRICAL SHOC,KDO NOTREMOVE COVER. NO USER- SERVICABLE PARTS INSID.E
REFE R SERVICING TO QUALIFIED SERVICE PERSONNE. L
Loudspeaker 1 (DUT)

Figure 3-8 shows how AmpConnect 621 is setup for a 6 Microphone Array.
Mic Bias – Set to SCM for all channels
Refer to the main SoundCheck manual for details on Power Averaging in the Post Processing chapter

Figure 3-2: Mic Array Message

AmpConnect 621TM Manual

Test Connections and Procedures

5

Single Loudspeaker Test
Reference Mic

Loudspeaker (DUT)

Input 1

Input 3

Input 5

Output 1

Input 2

Input 4

Input 6

Output 2

AmpConnect 621TM Listen, Inc. Made in U.S.A. Serial No.

Digital I/O

To SoundCheck PC USB Connection

Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 +3.3V Ret.

Amplifier Output

A+

B+

A-

B-

Chassis GND

USB 2.0

Back Panel
Input: 110-240V~ 50 /60Hz 200W Fuse: T2.5A
CAUTION: RISK OF ELECTRICAL SHOCK ­ DO NOT OPEN ATTENTION: RISQUE DE CHOC ÉLECTRIQUE ­ NE PAS OUFRIR
CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER. NO USER- SERVICABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

Figure 3-3: Single Loudspeaker Test

Complete test using AmpConnect 621 uses the physical setup shown in Figure 3-3 and the AmpConnect 621 Message Step shown in Figure 3-4.
BNC Input 1 routed to Audio Interface Input 1
Gain: +20 dB
Mic Bias: SCM
Amplifier: Output A
This requires that the Analysis Step in the SoundCheck sequence is configured to use the AmpConnect 621 Impedance Channel as shown in Figure 3-5.

Figure 3-4: Message Step

Figure 3-5: Impedance Analysis Step
See AmpConnect 621 Message Step on page 21.

6

Test Connections and Procedures

AmpConnect 621TM Manual

Two Loudspeaker Test
Reference Mic 2 Reference Mic 1

Loudspeaker (DUT) 2
Loudspeaker (DUT) 1

Input 1

Input 3

Input 2

Input 4

AmpConnect 621TM Listen, Inc. Made in U.S.A. Serial No.

Input 5

Output 1

Input 6

Output 2

Digital I/O

Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 +3.3V Ret.

Amplifier Output

A+

B+

A-

B-

Chassis GND

USB 2.0

Back Panel
Input: 110-240V~ 50 /60Hz 200W Fuse: T2.5A
CAUTION: RISK OF ELECTRICAL SHOCK ­ DO NOT OPEN ATTENTION: RISQUE DE CHOC ÉLECTRIQUE ­ NE PAS OUFRIR
CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER. NO USER- SERVICABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

To SoundCheck PC USB Connection

Figure 3-6: Two Loudspeaker Test

Figure 3-6 shows AmpConnect 621 setup to test two loudspeakers in one sequence run using “Toggle Amplifier Outputs”. By using the AmpConnect 621 Message Step in Figure 3-6, impedance measurements can be made on both loudspeakers without having to switch the wiring.
BNC Input 1 and 2 both set to:
Gain: +20dB
Mic Bias: SCM
BNC Input 1 Routed to Audio Interface Input 1
BNC Input 2 Routed to Audio Interface Input 2
Amplifier: Set to Toggle Amplifier Outputs, switching between outputs A and B on each sequence run. (See Toggle Amplifier Outputs on page 24)
Impedance Analysis Step: Set the same as Figure 3-5 on page 6

Figure 3-7: Toggle Outputs

AmpConnect 621TM Manual

Test Connections and Procedures

7

Microphone Test
DUT Mic

Reference Loudspeaker

Reference Mic

Input 1

Input 3

Input 2

Input 4

AmpConnect 621TM Listen, Inc. Made in U.S.A.
Serial No.

Input 5

Output 1

Input 6

Output 2

Digital I/O

Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 +3.3V Ret.

Amplifier Output

A+

B+

A-

B-

Chassis GND

USB 2.0

Back Panel
Input: 110-240V~ 50 /60Hz 200W Fuse: T2.5A
CAUTION: RISK OF ELECTRICAL SHOCK ­ DO NOT OPEN ATTENTION: RISQUE DE CHOC ÉLECTRIQUE ­ NE PAS OUFRIR
CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER. NO USER- SERVICABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

To SoundCheck PC USB Connection
Figure 3-8: Microphone Test

The Microphone test setup in Figure 3-8 shows how AmpConnect 621 is setup to measure a DUT Mic vs. a Reference Mic as found in the Mic Substitution sequence included with SoundCheck.
Reference Mic connected to BNC Input 1 Gain: 0 dB
Mic Bias: SCM
DUT Mic connected to BNC Input 2 Gain: 0 dB
Mic Bias: Should be set to the requirement of the DUT Mic
Amplifier: Output A

Figure 3-9: Mic Substitution Message

8

Test Connections and Procedures

AmpConnect 621TM Manual

Hardware and Calibration

SoundCheck Hardware Configuration
The Hardware Configuration in SoundCheck must be setup for use with AmpConnect 621 before attempting a measurement. The Plug and Play feature in SoundCheck ensures that all the required Hardware Editor channels and Calibration Editor signal paths are established when AmpConnect 621 is connected to the computer.

Plug and Play
“Automatically create Signal Paths for Listen Devices” recognizes Listen Hardware and loads the correct input and output Vp values stored in the AmpConnect 621 audio interface memory.
The Vp value defines the maximum peak voltage that corresponds to 0 dBFS (Full Scale Deflection).
Settings are found in SoundCheck Preferences > Launch. This is enabled by default.
See the main SoundCheck manual > SoundCheck Main Screen > Preferences for more information on “Automatically create Signal Paths for Listen Devices”.

Figure 4-1: Hardware Editor

Driver Selection
AmpConnect 621 should be set to use the preferred ASIO driver as shown in Figure 4-2. AmpConnect 621 can also be used with WASAPI drivers.

Swapping Devices
If you swap one AmpConnect 621 for a different AmpConnect 621 while SoundCheck is open:
Open the SoundCheck Hardware Editor
Click Refresh. The editor will update to show the serial number of the new unit in the Device field as well as the new Vp values. The Listen Hardware Tab will also update and show that the new interface has replaced the old one.

Figure 4-2: Refresh Hardware Editor

AmpConnect 621TM Manual

Hardware and Calibration

9

Hardware Editor
The sample rate for AmpConnect 621 is set to 44.1kHz by default. Click on the drop-down arrow in the Default Sample Rate column and select from the available rates. This will update all input and output sample rate fields for the device.

Figure 4-3: Hardware Editor – Audio Tab

Latency – The Latency value for each sample rate is preset for AmpConnect 621. Generally these values should not need to be adjusted. For default Latency values see the tables on page 12.

Latency is the round trip time delay between input and output channels on a single audio interface when operating in full-duplex mode (record and play simultaneously). Consistent latency is essential for sample accurate measurements such as Absolute Phase. Refer to the SoundCheck Manual > Hardware Configuration > Latency Adjustment.

The following process should be followed if you find that latency is slightly different than the default hardware step included with SoundCheck. This could be due to differences in motherboard or driver version.
1. Open the Hardware Editor. Since Latency is Sample Rate dependent, click on the Default Sample Rate drop down to select the desired rate.

Figure 4-4: Sampling Rate

2. Click on the drop down arrow next to the value in the Latency field of the Hardware Editor. Select Edit and the Latency Table will open.
3. Set the Latency for the desired sample rate to 0 (zero) and click OK.

4. Make sure the sample rate of the audio interface has updated. Change the
ASIO Buffer/USB Streaming mode for the audio interface in the ASIO Control Panel (if applicable). Typically there is no buffer control for WDM / WASAPI.

5. Run the Self Test sequence from the Calibration folder in SoundCheck. This will give you the Latency for the new Buffer size or Sample Rate. (Some audio interfaces may require “fine tuning” of the Latency value by following Step 5 and then repeating Step 4.)

Figure 4-5: Edit Latencies Table

6. Enter this value in the Latency field of the Hardware Editor Sample Rate/Latency Table. Repeat this process for other required Sample Rates.

10

Hardware and Calibration

AmpConnect 621TM Manual

7. All channels, analog or digital, must have the same latency value per sample rate for that audio interface. This ensures the system will work correctly if they are used simultaneously in a sequence.

Latency Changes

Latency is the round trip time delay between input and output channels on a single audio interface when operating in full-duplex mode (record and play simultaneously). Consistent latency is essential for sample accurate measurements such as Absolute Phase. Refer to the SoundCheck Manual > Hardware Configuration > Latency Adjustment.

The following process should be followed if you find that latency is slightly different than the default hardware step included with SoundCheck. This difference can be due to motherboard or driver changes.
1. Open the Hardware Editor. Since Latency is Sample Rate dependent, click on the Default Sample Rate drop-down to select the desired rate.

Figure 4-6: Sampling Rate

2. Click on the drop-down arrow next to the value in the Latency field of the Hardware Editor. Select Edit and the Latency Table will open.

3. Set the Latency for the desired sample rate to 0 (zero) and click OK
4. Make sure the sample rate of the audio interface has updated. Change the ASIO Buffer/USB Streaming mode for the audio interface in the ASIO Control Panel (if applicable). Typically there is no buffer control for WDM / WASAPI.

5. Run the Self Test sequence from the Calibration folder in SoundCheck. This will give you the Latency for the new Buffer size or Sample Rate. (Some audio interfaces may require “fine tuning” of the Latency value by following Step 5 and then repeating Step 4.)

Figure 4-7: Edit Latencies Table

6. Enter this value in the Latency field of the Hardware Editor Sample Rate/Latency Table. Repeat this for other required Sample Rates.

7. All channels, analog or digital, must have the same latency value per sample rate for that audio interface. This ensures the system will work correctly if they are used simultaneously in a sequence.

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Default Latency

Windows Default Latency in Samples for Typical Sample Rate and Buffer Values

USB Connection ASIO/USB Buffer Samples / ASIO Samples / WASAPI

44.1 kHz 512 / Safe 1364 1382

48 kHz 512 / Safe 1429 1494

88.2k 1024 / Safe 2641 2675

96 kHz 1024 / Safe 2765 2895

176.4 kHz 2048 / Safe 5250 5754

192 kHz 2048 / Safe 5494 5754

Enter the Samples value in the Hardware Editor Latency field for the selected Sample Rate. Figure 4-8: Windows Latency in Samples

Important!

After importing the stock HAR file (C:SoundCheck xxStepsHardwareApproved
HardwareAmpConnect 621 WASAPI.Har), the Latency values for WASAPI must be manually edited using the values from Figure 4-8 following the steps noted in Latency Changes on page 11.

USB Connection Samples

macOS Default Latency in Samples for Typical Sample Rate Values

44.1 kHz 1202

48 kHz 1302

88.2k 2320

96 kHz 2510

176.4 kHz 4612

Enter the Samples value in the Hardware Editor Latency field for the selected Sample Rate. Figure 4-9: macOS Latency in Samples

192 kHz 4985

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AmpConnect 621 Hardware Configuration
The Vp values for the AmpConnect 621 are factory-programmed, and are automatically loaded into the Hardware Editor when “Automatically create Signal Paths for Listen Devices” is turned on. See Plug and Play on page 9.
The Calibration Editor is also updated with the correct signal paths for the associated hardware. See SoundCheck Calibration Configuration on page 15.

Figure 4-10: Hardware Editor Vp Values
If AmpConnect 621 is added to an existing SoundCheck configuration, the channels will automatically be displayed in the hardware editor after the pre- existing channels.
Important! Do not use different input and output driver types for an audio interface, e.g.: ASIO for inputs and WASAPI for outputs. Doing so will result in an Acquisition Step error.
WDM Drivers WDM drivers are available in the Hardware Editor for AmpConnect 621. WDM drivers only allow access to Input Channels 1 and 2 of AmpConnect 621.
Note: WDM drivers do not allow for consistent Latency and require that you use Auto Delay or Auto Delay+ in any Analysis Step. WDM drivers should not be used when making Absolute Phase measurements.

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Listen Hardware Tab

AmpConnect 621 is automatically recognized by SoundCheck according to serial number. Each device is added to the Listen Hardware page and automatically named. If simply exchanging one AmpConnect 621 for another, the Device ID remains AC621-1 and the Serial # field updates.

Right-click on the Device ID to change the following:

Rename – Change the Device ID field to a unique name. The example in Figure 4-11 shows the Device ID of AmpConnect 621 is
set to: AC621-1

Delete – Remove the selected item from the list

Assign Startup Default – Set the initial settings that the device will adopt when connected to this SoundCheck system

Figure 4-11: AmpConnect 621 Setup

Startup Default
The startup default editor, shown in Figure 4-12, initially contains settings commonly used for loudspeaker testing, explained below. These can be modified to suit your test requirements.

Note: The Self Test sequence will return AmpConnect 621 to factory default settings. Restore your Startup Default settings by clicking Apply in the editor show in Figure 4-12 or restart SoundCheck. See Self Test Sequence on page 16.

Inputs

Source: All BNC inputs are routed to the their respective Audio Interface channels, e.g.: BNC Input 1 routed to Audio Interface Input 1
Gain: All channels set to Mic Bias set to Voltage with +20 dB of gain
Mic Bias: All channels set to SCM for use with Listen’s SCM reference microphones
Switching Mic Bias on or off with an AmpConnect 621 Message Step during a sequence run may require a Wait Time of 2 seconds in the step to allow for settling time.
Amplifier: Always routed to Amplifier input of Audio Interface. Gain is set to 0dB.
Impedance: Always routed to Impedance of Audio Interface. Gain is set to 0dB.
Outputs

Figure 4-12: Startup Default

Output 1 and 2: The Audio Interface Outputs are routed to the BNC outs respectively. This allows for the use of an external amplifier if more channels are required.

Amplifier: Power Amp Output routed to Binding Post Output A

Full details on settings and use of the Message Step are covered in AmpConnect 621 Message Step on page 21.

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SoundCheck Calibration Configuration
Figure 4-13: System Calibration Figure 4-13 shows the Calibration Editor with the default Signal Paths used in SoundCheck.
Direct In and Direct Out are always linked to their respective Hardware Channels and use Unity Cal for the Calibrated device
Mic In 1 through 6 are linked to their respective Hardware Channels and have individual DAT files to account for the unique calibration characteristics of each mic: Mic 1 through Mic 6.dat.
Amp Monitor 1 is always linked to Input 7. Amp Monitor 1.dat is always unity (1 V/V). Impedance 1 is always linked to Input 8. Impedance Monitor VA 1.dat is always unity (1 V/V). Amp 1 is always linked to Output 3 and uses the Amp 1.dat calibrated device. There is a
calibration sequence specifically for AmpConnect 621 which will allow the creation of a correction curve for the amplifier output.

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Self Test Sequence
After the Hardware and Calibration configurations are complete, you can run AmpConnect 621 Self Test.sqc to verify the performance of your AmpConnect 621. This sequence is located in: C:SoundCheck x.xSequencesCalibration

Figure 4-14: Self Test Results
Results include: Frequency Response for Line In/Out and Amplifier Self Noise Spectrum for Line In/Out Results margins for Response, Sensitivity and Self Noise
Important! At the end of the sequence, AmpConnect 621 is returned to factory default settings.

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Amplifier Calibration
The gain of AmpConnect 621 is fixed at 26.4 dB. The mono power amplifier in AmpConnect 621 can be calibrated in SoundCheck if you want to create the output correction curve for the amp and fine tune the Sensitivity value.
Calibration Editor Open the Calibration Editor and select the Output tab as shown in Figure 4-15. Under Output Signal Path select Amplifier 1. This path is preset as follows:
Output Calibrated Device: Amp 1.dat Calibration Sequence: AC621 Amp Calibration Input Signal Path: Amp Monitor 1 Click Calibrate Device to run the calibration sequence and follow the prompts to complete the process.

This amplifier calibration does not take into account cable lengths greater than 2 meters (approx 6.5 feet). If you are using long lengths of cable between AmpConnect 621 and the DUT speaker, we suggest you perform a standard amplifier calibration as noted in the Calibration chapter of the SoundCheck manual.

Figure 4-15: Amp Calibration

Important! At the end of the amp calibration sequence, AmpConnect 621 is returned to Factory Default settings.

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Microphone Calibration
If using one of Listen’s SCM reference microphones the Mic Bias for the selected channel must be set to SCM or if using an IEPE microphone IEPE must be selected in the Startup Default or in a Message step as shown in Figure 4-16.
Any of the BNC inputs can be used with a reference microphone and should be calibrated according to the following instructions.

Figure 4-16: Mic Bias

This procedure allows you to check a reference microphone’s sensitivity against the microphone manufacturer’s specifications.
1. Open the Calibration Editor and select the Input tab. The Calibration Sequence should be set to Microphone.

2. Click Calibrate Device.

3. Select your calibrator model # from the pulldown menu or select Other Calibrator and enter the acoustic calibrator’s reference level and frequency as shown in Figure 4-18.

The microphone calibrator’s reference level should be indicated in its specification as an dBSPL value (relative to 20 µPa) at a reference frequency, e.g., for the Brüel & Kjær Type 4231 Acoustic Calibrator:
Sound Pressure Level: 94.00 dB ± 0.20 dB

Auto Dev Auto Chan

Frequency: 1000 Hz ± 0.1%

4. Under Measurement Microphone select the model number from the drop-down list.

Figure 4-17: Microphone Calibration

Note: The Auto Dev-Auto Ch feature ensures that the Gain setting for the selected AmpConnect 621 channel is automatically updated in the Calibration Gain fields.
Note: Refer to the SoundCheck Instruction Manual for information on adding a new mic.

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5. Place the acoustic calibrator on the reference microphone and click Calibrate to measure its sensitivity.

If the Measured Sensitivity is outside the manufacturer’s specifications, a flashing FAILED message will appear. Check your connections and make sure the calibrator is turned on before assuming something is wrong with the microphone.

If a Reference Frequency of 1000 Hz is entered, but the Calibrator’s actual frequency is 1008 Hz, the Calibration may Fail. To verify the Calibrator’s frequency, use the Spectrum Analyzer under the Main Screen – Instruments menu.

Figure 4-18: Calibrate

The meter in Figure 4-18 indicates the corresponding dB level relative to 1 Volt per Pascal. If it varies by a few tenths of a dB from the last calibration measurement, do not be alarmed, this is normal. If it varies by more than 1 dB or failed the sensitivity test, the microphone should be checked by a qualified calibration lab.

TEDS Microphone
AmpConnect 621 supports TEDS transducers. Click on Read TEDS in the Calibration Editor when a TEDS transducer is connected to an AmpConnect 621 input. The Sensitivity value automatically updates along with the serial number and calibration date for the connected transducer.

Figure 4-19: TEDS

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AmpConnect 621 Message Step

The AmpConnect 621 Message Step and the Hardware Editor Startup Default settings are identical. All settings noted in this section can be applied to the settings mentioned in Startup Default on page 14.
SoundCheck controls the operation of AmpConnect 621 through Message Steps.
SoundCheck automatically enables enable USB control as soon as AmpConnect 621 has been connected to the SoundCheck computer via USB and the computer has recognized the device

Inputs
Six input channels allow for the selection of Source, Gain and Mic Bias.
See Front Panel Indicators on page 2 for more information on signal monitoring.

Source – BNC Input 1 through 6
Allows the routing of the signal from the physical back panel input to the associated input of the internal audio interface. Figure 5-1 shows BNC Input 1 routed to Input 1 of the Audio Interface channels.

Source – Monitor Out 1 or 2 Allows the routing of the output signal of the internal audio interface to one of the inputs of the internal audio interface.
Monitor Out 1 can be routed to Odd number channels
Monitor Out 2 can be routed to Even number channels

Figure 5-1: Startup Default

Gain

Selections in dB are: -20, 0, +10, +20 and +30 Input gains are independently variable across all six channels

Mic Bias Off: For microphones or electronics that do not require power SCM: Provides +10 VDC bias to SCM microphones and electret condensers IEPE: Provides 28 VDC @ 4 mA constant current bias for pre-polarized reference microphones

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Input Muting
Important! An input is Muted for 2 seconds when switching between Off and SCM / IEPE Bias. If a Message Step is used to change Bias settings during the run of a SoundCheck sequence, a “2 second Wait time” should be set in the Message Step to account for this.

Figure 5-2: Wait Time
Amplifier Voltage – This is an independent input to SoundCheck. Gain is provided to ensure best signal to noise ratio. The default is 0dB. When lower signal levels are used you can switch the gain to +20dB or +40 dB.
Amplifier Current – This is an independent input to SoundCheck. Gain is provided to ensure best signal to noise ratio. The default is 0dB. When lower signal levels are used you can switch the gain to +20dB or +40 dB.
Outputs
BNC Out 1 and 2
This routes the Output of the internal audio interface to the BNC outputs. This is typically used to drive an external amp, headphone amp or other external device.
Monitor Out 1 and 2
The audio interface outputs are internally available so that Monitor In can be selected in the Input Source section to make an internal loop back. This is used in the AmpConnect 621 Self Test sequence to verify the performance of the device.
Monitor Out 1 can be routed to the odd number Input channels: 1, 3 and 5
Monitor Out 2 can be routed to the even number Input channels: 2, 4 and 6
Gain and Mic Bias are automatically off (grayed out) when Monitor Out is selected
Amplifier
The mono power amp of AmpConnect 621 can be routed to the back panel Binding Post A, Binding Post B, A+B or Off.
Toggle Outputs
This is used to switch the Amplifier Output as a test sequence runs in Continuous or Loop operation. This can be used to test a loudspeaker on one test fixture while setting up a different speaker on another fixture. (The fixtures and test microphones should be identical.)
Switching is automatic so that the first pass of the sequence uses Amplifier Output A and the second pass uses Amplifier Output B.

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USB Control Via SoundCheck

AmpConnect 621 is controlled by a SoundCheck Message Step and through the Hardware Editor Startup Default. This enables all AC621 settings and parameters such as gain and signal routing to be controlled within a test sequence. An eight-bit Digital I/O port provides digital control and/or status monitoring of external devices for operator feedback, test fixture control, etc.
The following example shows how to use a Message Step in SoundCheck to control AmpConnect 621.

AmpConnect 621 Message Step

Open the AmpConnect 621 Message Step from the Active Sequence in the right hand section of the editor.

Message Title – This is the text that will be in the top of the step window as it is run.

Message – Select Listen Hardware as shown in Figure 6-1.

Device ID – The user can select which AmpConnect 621 should be used if multiple AmpConnect 621s are on the system.

Configure Listen Hardware – Opens the AmpConnect 621 settings window (see Figure 6-2)
Settings – The user selects the Pass/Fail state the step will yield in the Results section of the Memory List.

Figure 6-1: AmpConnect 621 Message Panel 1

Wait – Allows you to set a time period for the step to pause the run of the sequence. This can allow for “Settling Time” when switching Mic Bias or “switch closure times” associated with external devices connected to the Digital I/O of AmpConnect 621.

Apply – Click Apply to switch AmpConnect 621 to the new settings from Configure AmpConnect without having to run the sequence. This is useful for testing the settings.

Configure AmpConnect 621 The settings in Configure Startup Default and the AmpConnect 621 Message Step are identical.
Signal Routing – Inputs
This allows the routing of the following to the audio interface inputs 1 through 6: BNC Input 1 through 6
Monitor Out 1 or 2 (Loop back for self test) [Monitor Out 1 or 2 must be enabled in the Output section] Amplifier (internal loop back for amp calibration)
Impedance (internal current sense circuit)
Gain: -20 dB, 0 dB, +10 dB, +20 dB, +30 dB Mic Bias: Off, SCM and IEPE

Figure 6-2: Startup Default

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SoundCheck Acquisition Step Gain Field

Important! Switching Listen Hardware from Maximum Gain to Minimum Gain in the Acquisition Step is not recommended. This does not allow the input gain circuit sufficient time to stabilize. If you need to switch from Max Gain to 0 or Minimum Gain we recommend that you use a Listen Hardware Message step with a 500 mSec Wait Time to allow for settling.

Signal Routing – Outputs

BNC Out 1 and 2 – Routes the Output of the internal audio interface to the BNC outputs.

Figure 6-3: Wait Time

Monitor Out 1 and 2 – Audio interface outputs are internally available so that Monitor In can be selected in the Input Source section to make an internal loop back.

Monitor Out 1 can be routed to the odd number Input channels: 1, 3 and 5

Monitor Out 2 can be routed to the even number Input channels: 2, 4 and 6

Gain and Mic Bias are automatically off (grayed out) when Monitor Out is selected

Amplifier – Select Output A, Output B or Toggle Amplifier Outputs. See Toggle Amplifier Outputs on page 24.

Step Controls Apply – Click to send new settings to AmpConnect 621 Read Settings – Allows you to update the settings of the Message Step by Reading the current settings of AmpConnect 621 OK – Accept changes and close configuration window Cancel – Disregard changes and close configuration window then click Cancel on Message panel 1
Toggle Amplifier Outputs The Toggle control can be used to switch the Amplifier Output as a test sequence runs in Continuous or Loop operation. This can be used to test a loudspeaker on one test fixture while setting up a different speaker on another fixture. (The fixtures and test microphones should be identical.)
Toggle Outputs: Switches so that the first pass of the sequence uses Amplifier Output A and the second pass uses Amplifier Output B.

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Microphone Bias “Wait Time” If you turn the microphone bias voltage on or off during the run of a sequence, you may need to set a “Wait” period before proceeding to an Acquisition Step. The microphone and mic input circuit may require 2 seconds (approx.) of settling time before continuing the run of the sequence. See Sequence Editor > Step Configuration in the SoundCheck manual for instructions on setting “Wait time” in a Message Step.
Figure 6-4: Wait Time
Digital I/O Message Steps
Digital I/O settings are controlled through Digital I/O Message Steps in a SoundCheck sequence. SoundCheck can interact with PLC controls on a production line by using Digital I/O Message steps in a sequence. These steps control the Digital I/O port of AmpConnect 621. For more information see Digital I/O Operation on page 27.
Figure 6-5: Digital I/O – Write

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Digital I/O Operation

Connection

Connecting to the back panel Digital I/O requires a Phoenix plug, part number: 1803659, in order to wire to external devices. (optional part, contact Listen, Inc.)
Digital I/O Message

Figure 7-1: Phoenix Connection

8 Bits of digital I/O that can be written and read directly in SoundCheck
Used to control process indicator lights, relay boards and detect the state of switches, e.g.: Confirm that a test chamber is closed by verifying the state of a door switch
Communicate with PLCs in automated production lines
Receive TTL signals from other test equipment

Settings
Select the Digital I/O radio button
Device – Select the AmpConnect 621 device ID from the dropdown menu
Direction – Set the direction of communication for the step to Read (Input) or Write (Output). Separate steps must be used for Read and Write operations.
Enable Check Boxes – Select which Bit(s) are to be used in the step
Settings – The Pass/Fail radio buttons are not used
Wait – This allows you to set time for the settings of the step to be “passed to” or “received from” external devices before moving to the next step in the sequence.

Figure 7-2: Digital I/O

Digital I/O States Digital I/O Messages can be configured as either Read (Input) or Write (Output) Each Bit in a Message Step can be enabled or disabled using the Check Box above the Bit Switch. This allows you to ignore unnecessary bit settings when determining the Pass/Fail state of the Digital I/O Message. Unused Bits are grayed out. The expected state of the Bit is indicated by the switches: In the Digital I/O Message Step, you click on the Switches to set the state.
See Digital I/O Rules on page 29.
High – On – Green
Low – Off – Red

Note: Individual Digital I/O Message Steps may be required in a SoundCheck sequence to perform various operations.

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Direction: Read vs. Write
Write (Output): The selected bit on the Digital I/O port changes to a TTL “High state”. See Figure 7-3.

Read (Input): The Digital I/O is expecting to read a state change at the DIO input. A High bit means that the step expects the selected bit(s) to see a “High State” when the step is run. See Figure 7-4.
The bit settings are applied when a Message Step runs in the sequence.

The AmpConnect 621 Digital I/O port has 8 bits which can be
configured as Read or Write. It is best to pick a range of bits used as Write and the remaining bits used as Read when using both functions. The examples used above are based on bits 0 through 3 used as Write and bits 4 through 7 used as Read.

Figure 7-3: Digital I/O – Write

Enable Bits Check Box
Enable bits by selecting the Check Box above the appropriate bit. If the bit is not checked it will be ignored by the sequence.
Pass/Fail
Set the Pass/Fail condition the message should show when it runs in the sequence. This can be used in Conditional Branching. See Configure Step and Conditional Branching Rules in the main SoundCheck manual.

Figure 7-4: Digital I/O – Read

Wait
You can set an amount of time for the step to pause before proceeding to the next step in the sequence. This may be needed to allow for settling time or operation time of external devices.

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Digital I/O Rules Digital I/O Message Steps can be set to Read (Input) or Write (Output)
Best practice: Use a Digital I/O Message Step at the top of a sequence to “initialize” the Bits to a desired starting state
Bits are at ground when set Low, Message Step switch Off
Bits are at +3.3 V when set High, Message Step switch On
When set to Read (Input), enabled Bits set to High (On) are pulled high through an internal 100K resistor
The setting of the Bit indicates the state that you expect to read. That state is compared to the actual state of the physical Bit line to produce the PASS/FAIL result for the step.
The PASS/FAIL state of a Digital I/O Message Step set to Read is determined at the time the step is executed in the sequence.
If the state of any enabled Bit disagrees with the actual state of the selected Bit line, the step will issue a “FAIL” verdict when the step occurs during sequence run. This verdict is then used by the Step Configuration to perform Conditional Branching or sequence logic. See Step Configuration in the main SoundCheck Manual for more information.
If the state of all enabled Bits agree with the actual state of the Bit lines, the step will issue a “PASS” verdict.
Physical lines for Bits 0 through 7 have an internal 475 resistor in series with each line
The Pass/Fail radio buttons are not used
The digital I/O physical lines are +5 VDC tolerant. +5.5 VDC is maximum input.
The self-resetting fuse max operating current is 80 mA with trip point at 160 mA
Minimum turn on voltage is +2 VDC
Maximum turn off voltage is +0.8 VDC
Ret. – Digital I/O signal ground (at same potential as chassis ground)

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Digital I/O Write Example

Bit 0 – Write
The physical Bit 0 line is wired to an LED and a series resistor as shown in Figure 7-5
Similarly, this can be connected to a solid state relay or TTL input that responds to a +3.3 V DC state change

Digital I/O Port >1k Ohm
LED 1

Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 +5V Ret. (Gnd)

Figure 7-5: Bit 0 – Write

Figure 7-6 shows the Digital I/O Message Step that turns the Bit 0 LED on.
Subsequent steps in the sequence might be used to set Bit 1 High and Bit 2 High to perform other functions
This is especially useful when controlling multiple external relays
The Pass/Fail radio buttons are not used

Figure 7-7 shows the Digital I/O Message Step that turns the Bit 0 LED Off. (In this case, the step turns off all Bits set to Write.)
This step might also be used at the beginning of the sequence to make sure all Write Bits are set Low before the sequence starts

Figure 7-6: Bit 0 High

Figure 7-7: Bit 0 Low

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Digital I/O Read Examples
The Digital I/O input of AmpConnect 621 can read the state of external TTL voltage levels and switch closures in a SoundCheck test sequence.
When set to Read (Input), the selected Bit(s) are pulled high through an internal 100K resistor. +3.3 VDC is present at all enabled Bit lines that are set High in the Message Step (switch on) You may want to use external pull-up resistors to increase noise immunity or pull-down resistors to force the input low, as shown in Figure 7-8.

Bit 4 Pulled Low – Normally Open Switch
In Figure 7-8 a Normally Open switch is wired across Bit 4 and +5 VDC
A 2.2 k resistor is also wired from Bit 4 to Ret. (GND)
When the switch is open, the Bit 4 physical line will be pulled Low through the 2.2 k resistor
When the switch is closed, Bit 4 will go High when +3.3 VDC is applied

Digital I/O Port

Bit 0

External Switch (Normally Open)

Bit 1 Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

+3 .3 V

2.2k Ohm

Ret. (GND)

Figure 7-8: Bit 4 Pulled Low

When the Digital I/O Message Step in Figure 7-9 is executed in the sequence, it will Read the state of the physical input and compare it to the setting of Bit 4.
Bit 4 is set Low as the “normal” mode for the step so that it will react to the Bit being pulled high by the external switch closure
The Pass/Fail radio buttons are not used
If the actual state of the input agrees with the setting for Bit 4 the step will issue a “PASS” verdict

If the actual state disagrees the step will issue a “FAIL” verdict. This “FAIL” will be used in the Step Configuration shown in Figure 7-10.
Right click on a step in the Sequence Editor to select “Configure Step”
In this case, the “FAIL” verdict is used to tell the step to jump to a message, “Bit 4 Switch Closure”.
This might be used to stop the sequence and let the line operator know that a problem has occurred.
See Step Configuration in the main SoundCheck Manual for more information on uses of Conditional Branching

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Digital I/O Operation

Figure 7-9: Bit 4 Set Low
Figure 7-10: Jump On Fail 31

Bit 4 Pulled Low – Normally Closed Switch
This is similar to the previous example but shows how to deal with the difference between normally open and normally closed switches.
In Figure 7-11 a Normally Closed switch is wired across Bit 4 and Ret. (GND). This means that the state of Bit 4 is “Normally Low”.
A 2.2 k pull up resistor is also wired from Bit 4 to +3.3V
When the switch is open, Bit 4 will go High

Digital I/O Port
External Switch (Normally Closed)
2.2k Ohm

Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 +3 .3 V Ret. (GND)

Figure 7-11: Bit 4 – Normally Low

When the Digital I/O Message Step in Figure 7-12 is executed in the sequence, it will Read the state of the physical input and compare it to the setting of Bit 4.
Bit 4 is set Low as the “normal” mode for the step so that it will react to the Bit being pulled high by the external switch opening
The Pass/Fail radio buttons are not used
If the actual state of the input agrees with the setting for Bit 4 the step will issue a “PASS” verdict

If the actual state disagrees the step will issue a “FAIL” verdict. This “FAIL” will be used in the Step Configuration shown in Figure 7-13.
Right click on a step in the Sequence Editor to select “Configure Step”
In this case, the “FAIL” verdict is used to tell the step to jump to a message, “Bit 4 Switch Open”.

Figure 7-12: Bit 4 Set Low

Figure 7-13: Jump On Fail

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TTL Input Example SoundCheck may also need to receive a TTL signal from an external device such as a Production Line Controller.
Figure 7-14 shows the output of such a device connected across Bit 5 and Ret. (GND)
A pull down resistor is added between Bit 5 and Ret. (GND). The resistor value is dependent on the level of the TTL signal.
The max level allowed for the TTL signal is +5 VDC tolerant. Turn on voltage is +2 VDC nominal. Max turn off voltage is 0.8 VDC.
When the Production Line Controller sends a +3 VDC signal to Bit line 5, it will pull the bit High
The max output TTL signal is +3.3 VDC

Digital I/O Port

TTL Signal

• Production Line Controller

x Ohm Pull Down
Resistor

Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 +3.3V Ret. (GND)

Figure 7-14: Bit 5 – Normal Logic Input

When the Digital I/O Message Step is executed in the sequence, it will Read the actual state of the input and compare it to the Message Step setting of Bit 5 shown in Figure 7-15.
Bit 5 is set Low as the “normal” mode for the step so that it will react to the Bit being pulled High by the external +3.3 VDC signal
The Pass/Fail radio buttons are not used
If the actual state of the input agrees with the setting for Bit 5 the step will issue a “PASS” verdict

Figure 7-15: Bit 5 Set High

If the actual state disagrees the step will issue a “FAIL” verdict. This “FAIL” will be used in the Step Configuration shown in Figure 7-16.
Right click on a step in the Sequence Editor to select “Configure Step”
In this case, the “FAIL” verdict is used to tell the step to jump to a failure message, “Bit 5 Failed”.

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Figure 7-16: Jump On Fail
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Digital I/O Message Step Configuration
The example sequence in Figure 7-17 shows the Message Step “Bit 4 High” is the first step in the sequence. This step is configured to Jump to itself if the verdict is “Fail”.
If the verdict is “Pass”, the conditional branching is set to Jump to the next step in the sequence. This allows you to start a sequence and wait for an external switch to tell the sequence to proceed. The sequence simply loops back to the first step until the external switch changes state.
Message Step ­ Bit 4 High
Step Configuration ­ Jump to step 2 to continue sequence
Step jumps back to itself, waiting to read switch

Normally this would be the first step run in the sequence.
Step Configuration The Message Step Configuration will need to point at the appropriate steps in a sequence.
Right-click on the Bit 4 High Message Step and select Configure Step. The editor in Figure 7-18 shows the proper settings for the example sequence.
Jump on PASS is checked and the target is the next step in the sequence. In this case, it jumps to “Bit 4 Notice”. This will allow the sequence to continue running if the state of Bit 4 High is satisfied.
Jump on FAIL is checked and the target is the first step in the sequence. This creates the loop that waits for the state of Bit 4 High to pass.

Figure 7-17: Example Sequence

See Step Configuration and Conditional Branching in the main SoundCheck manual for more information.

Figure 7-18: Configure Step

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Specifications

Number of inputs Frequency Response Gain
Maximum input level according to gain setting
Mic Bias Settings IEPE Bias SCM (Electret) Bias Input Impedance Equivalent Input Noise THD+N Crosstalk @ 1 kHz Interchannel Phase TEDS (all Mic inputs)
Number of Outputs Frequency Response Maximum Output Level Output Impedance THD+N Crosstalk @ 1 kHz Inter-channel Phase

Mic/Line Inputs
6 Mic/Line Inputs, BNC connectors, Unbalanced 20 Hz to 20 kHz: +0.1/-0.4 dB (all sample rates) 10 Hz to 90 kHz: +0.1/-1.1 dB (at 192 kHz sample rate) -20, 0, +10, +20, +30 dB, +/- 0.25 dB typical -20 dB = 14.1 Vrms max
0 dB = 1.41 Vrms max +10 dB = 447 mVrms max +20 dB = 141 mVrms max +30 dB = 44.7 mVrms max Off / SCM / IEPE 28 VDC @ 4 mA constant current 10 VDC, 7.5 k 100 k minimum <14 uV typical @ 0 dB Gain, 20 Hz to 20 kHz BW < -80 dB at -1 dBFS, 44.1 kHz sample rate, 0 dB Gain; 20 Hz to 20 kHz BW < -77 dB at -1 dBFS, 192 kHz sample rate, 0 dB Gain; 20 Hz to 80 kHz BW >100 dB at 10 kHz +/- 0.5 degrees 20 Hz to 20 kHz IEEE Standard 1451.4
Line Outputs
2 Line Outputs, BNC connectors, Unbalanced 20 Hz to 20 kHz ± 0.1 dB 10 Hz to 90 kHz +0.1, -2 dB 2.82 Vrms < 1 , 20 Hz to 20 kHz < -97 dB at -1 dBFS, 44.1 kHz sample rate, 20 Hz to 20 kHz BW < -93 dB at -1 dBFS, 192 kHz sample rate, 20 Hz to 80 kHz BW >110 dB at 10 kHz ± 0.15 degrees, 20 Hz to 20 kHz

AmpConnect 621TM Manual

Specifications

35

Power Amplifier

Frequency Response

20 Hz to 20 kHz ± 0.1 dB 10 Hz to 90 kHz +0.1, -1 dB

Continuous Output Power

50 W RMS into 4 25 W RMS into 8

-82 dB (0.008%) typical @ 1W, 8, 44.1 kHz sample rate, 20 Hz to 20 kHz BW

THD+N

-76 dB (0.015%) typical @ 1W ,8, 192 kHz sample rate, 10 Hz to 80 kHz BW -90 dB (0.003%) typical @ 25W, 8, 44.1 kHz sample rate, 20 Hz to 20 kHz BW

-86 dB (0.005%) typical @ 50W, 4, 44.1 kHz sample rate, 20 Hz to 20 kHz BW

Output Noise Output Connector

< 200 uV typical, 20 Hz to 20 kHz BW 2 sets of Dual Binding Posts, in parallel, switchable (Off, A, B, A+B)

Speaker Impedance Range

Measure from 2.5 to 250 Ohms

Digital I/O

8 Bits

any Bit may be configured for input or output

Outputs

+3.3 VDC/GND 10 mA (max) each

Connector

External wiring requires Phoenix plug PN: 1803659, optional part

USB Audio Interface

Inputs Outputs

6 BNC unbalanced inputs 2 BNC unbalanced outputs, Amplifier output

Sample Rate Bit Depth

44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz and 192 kHz (44.1 kHz default) 24 bit

USB 2.0, Windows and macOS HID compliant, USB Type B Connector

USB Interface

USB Audio Class 2 (macOS, Windows 10) ASIO low-latency audio driver (Windows only)

Physical

Dimensions (no rack mount ears) 11.5″ x 17.0″ x 3.5″ (292 x 432 x 89 mm)

Weight

7.275 lbs (3.3kg)

Power

100-240 VAC 50/60 Hz, 140 Watts (max), IEC C13 power cord

Requires 2: T2.0A, 250V 5×20 mm Time Lag glass fuses

Fuse

Suggested replacement:

Eaton/Bussman BK/S506-2.0-R

Operating Temperature

32 to 104°F (0 to 40°C) ambient; 10 to 80% relative humidity, non-condensing
Note: power amplifier output may be limited to lower duty cycles at elevated operating temperature

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Specifications

AmpConnect 621TM Manual

Equipment Ratings
Normal Environmental Conditions AmpConnect may be used under the following environmental conditions:
Indoor use only, Pollution Degree 2 Altitudes up to 2,000 m Temperatures between 0 °C to 40 °C Maximum relative humidity 80% for temperatures up to 31 °C decreasing linearly to 50% relative
humidity at 40 °C
Power Requirements: 100-240 VAC, 50 or 60 Hz, 200W
Connecting AmpConnect to the AC mains supply AmpConnect must be connected to a 50 or 60 Hz AC mains supply, with an operating voltage within 90 to 250 Vrms. The mains supply is connected to your AmpConnect via the power entry module located on the back panel. A 3-wire grounded power cord is supplied.
Ground the Instrument
Warning! A grounding-type power plug is included with AmpConnect 621. The chassis and cover must be connected to an electrical ground to minimize shock hazard. The ground pin must be firmly connected to an electrical ground (safety ground) terminal at the power outlet. Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury.

USB Connection AmpConnect must be connected to the SoundCheck computer via the included USB cable in order to meet FCC and CE requirements.
Cleaning Clean the outside of the instrument with a soft, lint-free, slightly dampened cloth. Do not use detergent or chemical solvents.
Amplifier Operation at High Output Levels When operating the amplifier outputs, the minimum impedance is 4 ohms. Please note that Output A and B are connected in parallel and are provided for switching between two different loads under test. When both are enabled the loads will be in parallel and impedance will drop accordingly.
When the amplifier outputs are operating at >20W continuously, the output signal can only be active 33% of the time. In other words, a 30 second signal burst followed by 60 seconds of silence will maintain safe operating temperatures. If these temperatures are exceeded, the amplifier output will shut down until the unit cools off. When operating at maximum power the duty cycle will decrease to 25%.

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Equipment Ratings and Approvals

37

Fuse Replacement The fuse is contained in the IEC power input module on the back panel of AmpConnect 621.
The power cord must be removed in order to replace the fuse
Use a flat blade screwdriver under the lip of the fuse holder to open the door as in Figure 9-1

Pull the fuse holder block out of the housing as in Figure 9-2. You may need to use the flat blade screwdriver to get it started.

Figure 9-1: Open Fuse Holder

Check both fuses with a multimeter. They are located on either side of the fuse block. See Figure 9-3. If necessary, replace both with: 2.0A, 250VAC, 5 mm x 20 mm, Time Lag fuses

Figure 9-2: Remove Fuse Block

Figure 9-3: Check Both Fuses

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Equipment Ratings and Approvals

AmpConnect 621TM Manual

After replacing the fuses, insert the fuse block into the power entry module with the electrical contacts facing into the housing as shown in Figure 9-4. Push it in until it is flush with the surface of the power entry module. Close the fuse holder door until it clicks. AmpConnect is now ready for use.

Fuse Type Requires 2: T2.0A, 250V 5×20 mm Time Lag glass fuses Suggested replacement:
Eaton/Bussman BK/S506-2.0-R

Figure 9-4: Check Both Fuses

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Equipment Ratings and Approvals

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CE Declaration of Conformity

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UK Declaration of Conformity

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Equipment Ratings and Approvals

AmpConnect 621TM Manual

Important Safety Information
Important Safety Precautions And Symbol Explanations
IMPORTANT SAFETY PRECAUTIONS AND SYMBOL EXPLANATIONS
AmpConnect 621 has been supplied in safe operating condition. This User’s Manual contains information and warnings that should be followed by the user to ensure safe and service free operation. Special note should be made of the following: 1. Read these instructions
2. Keep these instructions
3. Heed all warnings
4. Follow all instructions
5. WARNING: To prevent fire or electric shock, do not expose this equipment to rain or moisture. Do not use this apparatus near water.
6. Clean only with a dry cloth. Do not use spray or liquid cleaning solutions.
7. Airflow around the heat sink must remain unobstructed during use. Do not block or cover the heat sink. Install in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
9. The appliance coupler is the AC mains disconnect and should remain readily operable after installation.
10. Do not defeat the safety purpose of the grounding-type plug. This apparatus should be connected to a receptacle with a protective earthing (or ground) connection.
11. Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
12. Use only attachments/accessories specified by Listen, Inc.
13. Use only with hardware, brackets, stands, and components sold with the apparatus or by Listen, Inc.
14. Unplug the apparatus during lightning storms or when unused for long periods of time.
15. Whenever it is likely that the correct functioning or operating safety of the apparatus has been impaired, the apparatus must be made inoperative and be secured against unintended operation. Any adjustment, maintenance and repair of the open apparatus, under power, must be avoided as far as possible and, if unavoidable, must be carried out only by trained service personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

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Important Safety Information

43

Safety Symbols
The exclamation point triangle is used to indicate that caution is necessary when operating the device or control close to where the symbol is placed, or to indicate that the current situation needs operator awareness or operator action in order to avoid undesirable consequences. This alerts the user to the presence of important operating and maintenance (servicing) instructions in the this manual.
Heatsink and Output Connections CAUTION! This product is designed for short- term use during loudspeaker testing. Surface temperatures of the rear heatsink can exceed 60°C under certain conditions:
When the Output terminals are connected to impedances nominally less than the minimum rated output impedance load of 4 When the Output terminals are inadvertently short circuited When the product is operated at or near the maximum rated output power at a duty cycle exceeding 25% When the product is operated at ambient temperatures close to or exceeding the maximum rated ambient temperature of 40°C When the product is operated with the output waveform clipped When the product is loaded with loads other than a conventional loudspeaker with a voice coil Combinations of the above conditions The user should take precautions to avoid personal injury and damage to nearby objects should the heatsink exceeds 60°C. Keep all cables and wires away from the heatsink to avoid insulation damage.
Operating the product under the above conditions or with heatsink surface temperatures exceeding 60°C will not damage the product.
WARNING! – The lightning flash symbol is intended to alert the user to the presence of uninsulated “Dangerous Voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

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AmpConnect 621TM Manual

Vigtige sikkerhedsforskrifter og symbolforklaringer
Vigtige Sikkerhedsforskrifter Og Symbolforklaringer
VIGTIGE SIKKERHEDSFORSKRIFTER OG SYMBOLFORKLARINGER
AmpConnect 621 leveres i sikker driftstilstand. Denne brugervejledning indeholder oplysninger og advarsler, der skal følges af brugeren for at sikre en sikker og servicefri drift. Bemærk venligst følgende:
1. Læs denne vejledning
2. Opbevar denne vejledning
3. Overhold alle advarsler
4. Følg alle anvisninger
5. ADVARSEL: For at forhindre brand eller elektrisk stød må du ikke udsætte dette udstyr for regn eller fugt. Brug ikke denne enhed i nærheden af vand.
6. Rengør kun med en tør klud. Brug ikke spray eller flydende rengøringsmidler.
7. Luftcirkulation omkring kølelegemet skal forblive uhindret under brug. Undgå at blokere eller tildække kølelegemet. Installer enheden i overensstemmelse med producentens anvisninger.
8. Enheden må ikke installeres i nærheden af varmekilder såsom radiatorer, varmeenheder, ovne eller andre enheder (herunder forstærkere), der producerer varme.
9. Enhedens kontakt er hovedafbryder og bør altid være let at komme til efter installation.
10. Omgå ikke sikkerheden ved jordforbindelse. Denne enhed skal forbindes til et strømudtag med en intakt beskyttende jordforbindelse.
11. Beskyt netledningen mod at blive trådt på eller klemt, specielt ved stik, stikdåser og det punkt, hvor ledningen føres ud af enheden.
12. Brug kun tilslutninger/tilbehør som angivet af Listen, Inc.
13. Brug kun hardware, beslag, stande og komponenter som sælges sammen med enheden eller ved Listen, Inc.
14. Enheden skal frakobles under tordenvejr, eller når den ikke benyttes i længere tid.
15. Når det er sandsynligt, at den korrekte funktion eller driftssikkerhed af enheden er blevet forringet, skal enheden tages ud af drift og sikres mod utilsigtet brug. Enhver tilpasning, vedligeholdelse og reparation af den åbne enhed med strøm på, skal så vidt muligt undgås og må, hvis uundgåeligt, kun udføres af uddannet servicepersonale. Service er påkrævet når enheden er blevet beskadiget på nogen måde, som f.eks. strømforsyningsledningen eller stikket er beskadiget, der er spildt væske eller der er faldet genstande ned i enheden, hvis enheden har været udsat for regn eller fugt, ikke fungerer normalt, eller er blevet tabt.

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Manual

Sikkerhedssymboler
Trekanten med udråbstegnet bruges til at angive, at forsigtighed er nødvendig ved brug af enheden eller kontrol tæt på hvor symbolet er placeret, eller for at angive at den nuværende situation kræver opmærksomhed af operatøren eller en operatørhandling for at undgå uønskede konsekvenser. Det advarer brugeren om tilstedeværelsen af vigtige betjenings- og Vedligeholdelses-instruktioner (service) i denne vejledning.
Køleplade og Output Tilslutninger ADVARSEL! Dette produkt er beregnet til kortvarig brug under højttalertest. Overfladetemperaturer på det bageste kølelegeme kan overstige 60° C under visse forhold: Når Output-terminalerne er forbundet til impedanser nominelt mindre end den minimale udgangsimpedans- belastning på 4 . Når Output-terminalerne uforvarende kortsluttes Når produktet betjenes ved eller nær den maksimale nominelle udgangseffekt med en arbejdscyklus på over 25% Når produktet betjenes ved omgivende temperaturer tæt på eller overstigende den maksimale nominelle rumtemperatur på 40° C Når produktet betjenes med clipped output waveform Når produktet anvendes med andre belastninger end en konventionel højttaler med en svingspole Kombinationer af ovenstående betingelser
Brugeren skal tage forholdsregler for at undgå personskader og skader på nærliggende objekter hvis kølepladen overstiger 60° C. Hold alle kabler og ledninger væk fra kølepladen for at undgå isoleringsskader. Betjening af produktet under ovenstående betingelser eller hvis kølelegemets overfladetemperaturer overstiger 60° C vil ikke skade produktet.
ADVARSEL! – Lyn-symbolet er beregnet til at advare brugeren om tilstedeværelsen af uisoleret “Farlig Spænding” i produktets kabinet, der kan være tilstrækkelig stor til at udgøre en risiko for elektrisk stød for personer.

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Manual

Explications Importantes des Symboles et des Précautions de Sécurité
Explications Importantes des Symboles et des Précautions de Sécurité
EXPLICATIONS IMPORTANTES DES SYMBOLES ET DES PRÉCAUTIONS DE SÉCURITÉ
AmpConnect 621 a été fourni dans une condition de fonctionnement sécuritaire.
Ce manuel de l’utilisateur contient de l’information et des mises en gardes devant être suivies par l’utilisateur afin de garantir un fonctionnement sécuritaire et libre d’entretien. Prenez note de ce qui suit :
1. Lisez ces directives
2. Conservez ces directives
3. Tenez compte de toutes les directives
4. Respectez toutes les directives
5. MISE EN GARDE : Pour empêcher un incendie ou un choc électrique, n’exposez pas cet équipement à un environnement humide (pluie ou humidité). N’utilisez pas cet appareil près d’une source d’eau.
6. Nettoyez-le seulement avec un chiffon sec. N’utilisez pas de solutions de nettoyage par pulvérisation ou liquide.
7. Le flux d’air autour du dissipateur de chaleur doit demeurer non-bloqué lors de l’utilisation de l’appareil. Ne bloquez pas et ne couvrez pas le dissipateur de chaleur. Installez l’appareil selon les directives du fabricant.
8. N’installez pas de toute source de chaleur, comme les radiateurs, les registres d’air chaud, les fours, ou les autres appareils (incluant les amplificateurs) produisant de la chaleur.
9. Le coupleur de l’appareil est le débranchement secteur CA et doit demeurer opérationnel en tout temps après l’installation.
10. Ne modifiez pas les fins de sécurité de la fiche de type mise à la terre. Cet appareil doit être branché à une prise avec une connexion de mise à la terre.
11. Assurez-vous que l’on ne puisse pas marcher sur ou pincer le cordon électrique. Spécialement au niveau des fiches et des prises, et à l’endroit où ces dernières sortent de l’appareil.
12. Utilisez seulement des accessoires spécifiés par Listen, Inc.
13. Utilisez seulement avec du matériel, des supports et des composants vendus avec l’appareil ou par Listen, Inc.
14. Débranchez l’appareil lors de tempêtes électriques ou lorsqu’il n’est pas utilisé pendant de longues périodes de temps.
15. Dès qu’il semble probable que le bon fonctionnement sécuritaire de l’appareil ait été compromis, on doit cesser d’utiliser ce dernier et il doit être protégé contre tout fonctionnement involontaire. Tout réglage, entretien et réparation de l’appareil ouvert, sous tension, doit être évité le plus possible et, sinon, doit être effectué seulement par du personnel d’entretien formé. L’entretien est requis lorsque l’appareil a été endommagé de quelque façon, comme au niveau du cordon électrique, ou de la fiche, ou si du liquide a été déversé sur l’appareil, ou si des objets sont tombés dessus, ou si l’appareil a été exposé à un environnement humide (pluie, humidité), ou s’il ne fonctionne pas normalement ou si on l’a laissé tomber.

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Explications Importantes des Symboles et des Précautions de Sécurité

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Manual

Symboles de sécurité
Le triangle du point d’exclamation est utilisé pour indiquer qu’une précaution est nécessaire lors de l’utilisation de l’appareil ou de la télécommande près de l’endroit où se trouve le symbole, ou pour indiquer que la situation actuelle demande une présence d’esprit de l’opérateur ou un geste de l’opérateur afin d’éviter des conséquences non-désirées. Cela avertit l’utilisateur de la présence d’instructions importantes d’utilisation et d’entretien contenues dans ce manuel.
Branchements du dissipateur de chaleur et de la sortie AVERTISSEMENT ! Ce produit est conçu pour une utilisation à court-terme lors d’un test d’un haut- parleur. Les températures de la surface du dissipateur thermique arrière peuvent dépasser les 60 °C sous certaines conditions :
Lorsque les bornes de sortie sont branchées à des impédances nominalement moindre que la charge d’impédance de sortie nominale minimale de 4?
Lorsque les bornes de sortie sont involontairement mises en court-circuit Lorsque le produit est utilisé à ou près de la puissance de sortie nominale maximale à
un cycle de service dépassant les 25 % Lorsque le produit est utilisé dans des températures ambiantes près de ou dépassant la
température ambiante nominale maximale de 40 °C Lorsque le produit est utilisé avec le signal de sortie écrêté Lorsque le produit a des charges autres qu’un haut-parleur conventionnel avec une
bobine acoustique Combinaisons des conditions ci-dessus
L’utilisateur doit prendre les précautions nécessaires pour éviter les blessures personnelles et les dommages aux objets tout près si le dissipateur de chaleur dépassait les 60 °C. Conservez tous les câbles et les fils loin du dissipateur de chaleur pour éviter des dommages à la gaine d’isolation.
Le fonctionnement de ce produit en-dessous des conditions ci-dessus ou avec des températures de la surface du dissipateur de chaleur dépassant les 60 °C n’endommagera pas le produit.
AVERTISSEMENT! – Le symbole de l’éclair vise à alerter l’utilisateur de la présence d’une «tension dangereuse» non isolée à l’intérieur de l’enceinte du produit qui peut être d’une amplitude suffisante pour constituer un risque d’électrocution pour les personnes.

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Explications Importantes des Symboles et des Précautions de Sécurité

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Manual

Wichtige Sicherheitsvorkehrungen und Symbol-erklärungen Wichtige Sicherheitsvorkehrungen und Symbol-erklärungen

WICHTIGE SICHERHEITSVORKEHRUNGEN UND SYMBOLERKLÄRUNGEN
Der AmpConnect 621 wurde in einem betriebssicheren Zustand ausgeliefert.
Dieses Handbuch enthält Informationen und Warnungen, die von den Nutzern beachtet werden sollten, um einen sicheren und wartungsfreien Betrieb zu gewährleisten. Hierzu sollten die folgenden Hinweise genau beachtet werden:
1. Lesen Sie diese Anweisungen
2. Bewahren Sie diese Anweisungen auf
3. Beachten Sie alle Warnungen
4. Folgen Sie allen Anweisungen
5. WARNUNG: Um Brand oder Stromschläge zu verhindern, darf das Gerät auf keinen Fall Regen oder Feuchtigkeit ausgesetzt werden. Verwenden Sie dieses Gerät nicht in der Nähe von Wasser.
6. Reinigen Sie das Gerät nur mit einem trockenen Tuch. Verwenden Sie keine Sprays oder flüssigen Reinigungslösungen.
7. Während der Benutzung muss die freie Luftzirkulation um den Kühlkörper herum stets gesichert sein. Der Kühlkörper darf weder blockiert noch abgedeckt werden. Bei der Installation sind die Anweisungen des Herstellers zu beachten.
8. Installieren Sie das Gerät nicht in der Nähe von Wärmequellen wie Heizkörpern, Wärmespeichern, Öfen oder anderen Geräten (einschließlich Verstärkern), die Wärme erzeugen.
9. Der Netzstecker dient zur Trennung des Gerätes von der Stromversorgung und sollte jederzeit erreichbar sein.
10. Die Sicherheitsfunktion des geerdeten Steckers darf nicht umgangen oder aufgehoben werden. Das Gerät darf nur an eine Steckdose mit Schutzerdung (oder Masse) angeschlossen werden.
11. Das Netzkabel muss so geschützt werden, dass niemand auf das Kabel treten kann und dass es nicht gequetscht werden kann. Dies gilt besonders für die Bereiche am Stecker, an den Anschlussbuchsen und an den Stellen, an denen das Kabel aus dem Gerät herausgeführt wird.
12. Verwenden Sie nur Zubehör/Zusatzgeräte, die von Listen Inc. für diesen Zweck zugelassen wurden.
13. Verwenden Sie das Gerät ausschließlich mit Geräten, Halterungen, Ständern und Komponenten die zusammen mit dem Gerät oder von Listen Inc. verkauft wurden.
14. Während eines Gewitters oder bei längerer Nichtverwendung muss das Gerät von der Stromversorgung getrennt werden.
15. Wenn angenommen werden muss, dass die einwandfreie Funktion und Betriebssicherheit des Gerätes beeinträchtigt sein könnte, muss das Gerät in jedem Einzelfall außer Betrieb gesetzt und gegen unbeabsichtigten Betrieb gesichert werden. Wenn das Gerät an den Strom angeschlossen ist, muss jede Einstellung, Wartung und Reparatur am geöffneten Gerät so weit wie möglich vermieden werden. Fall dies dennoch unvermeidbar sein sollte, dürfen diese Arbeiten nur von ausgebildetem Fachpersonal durchgeführt werden. Eine Wartung ist immer erforderlich, wenn das Gerät in irgendeiner Weise beschädigt wurde, z.B., wenn das Netzkabel oder der Stecker beschädigt ist, Flüssigkeit oder Gegenstände in das Gerät eingedrungen sind, das Gerät Regen oder Feuchtigkeit ausgesetzt war, wenn das Gerät nicht normal funktioniert oder fallen gelassen wurde.

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Sicherheitssymbole
Das Ausrufezeichensymbol wird immer dann dargestellt und in der Nähe der Stelle angezeigt, an der besondere Vorsicht beim Betrieb oder bei der Steuerung des Gerätes erforderlich ist. Es wird auch angezeigt, wenn die besondere Aufmerksamkeit oder der Eingriff des Nutzers erforderlich ist um ungewünschte Konsequenzen zu vermeiden. Dieses Zeichen weist den Nutzer auf die besonderen Betriebs- und Wartungserfordernisse in diesem Handbuch hin.
Kühlkörper und Ausgangsanschlüsse VORSICHT! Dieses Produkt ist für den kurzfristigen Einsatz bei Lautsprecherprüfungen konzipiert. Unter bestimmten Bedingungen kann die Oberflächentemperatur des hinteren Kühlkörpers 60°C überschreiten. Z.B.,
Wenn die Ausgangsanschlüsse mit Impedanzen verbunden sind, die nominal kleiner als die minimale Nennausgangsimpedanz von 4 Ohm sind.
Wenn die Ausgangsklemmen versehentlich kurzgeschlossen wurden. Wenn das Gerät an oder nahe der maximalen Nennausgangsleistung und einem
Arbeitszyklus von mehr als 25% betrieben wird. Wenn das Gerät in einer Umgebungstemperatur betrieben wird, die nahe an oder über
der maximal erlaubten Umgebungstemperatur von 40°C liegt. Wenn das Gerät mit begrenzter Ausgangswellenform betriebenen wird. Wenn das Gerät mit Lautsprecherlasten betrieben wird, die von den üblichen Lasten für
Lautsprecher mit Schwingspule abweichen. Bei Kombinationen der oben genannten Bedingungen.
Um Verletzungen oder Beschädigungen benachbarter Gegenstände zu vermeiden sollte der Nutzer geeignete Vorkehrungen treffen, wenn die Oberflächentemperatur des Kühlkörpers 60°C überschreitet. Um Schäden an der Isolierung zu vermeiden, sollten sich keine Kabel oder Leitungen in der Nähe des Kühlkörpers befinden.
Der Betrieb des Gerätes unter den oben genannten Bedingungen oder mit einer Oberflächentemperatur des Kühlkörpers von über 60°C führt nicht zur Beschädigung des Gerätes.
WARNUNG! -Das Blitzsymbol soll den Benutzer auf das Vorhandensein nicht isolierter “gefährlicher Spannung” innerhalb des Gehäuses des Produkts aufmerksam machen, die eine ausreichende Stärke aufweisen kann, um die Gefahr eines Stromschlags für Personen darzustellen.

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Información de Seguridad y Símbolos
Información de Seguridad y Símbolos
PRECAUCIONES IMPORTANTES DE SEGURIDAD Y EXPLICACIONES DE SÍMBOLOS
AmpConnect 621 se entregó en condiciones seguras de funcionamiento. Este manual del usuario contiene información y advertencias que el usuario debe respetar para garantizar el funcionamiento seguro y sin mantenimiento. Se debe prestar especial atención a lo siguiente:
1. Lea estas instrucciones.
2. Conserve estas instrucciones.
3. Preste atención a todas las advertencias.
4. Siga todas las instrucciones.
5. ADVERTENCIA: Para evitar incendios o descargas eléctricas, no exponga el equipo a la lluvia o la humedad. No use este aparato cerca del agua.
6. Limpie solo con un paño seco. No use soluciones de limpieza líquidas ni en rociador.
7. No se debe obstruir el flujo de aire alrededor del disipador térmico durante el uso. No bloquee ni cubra el disipador térmico. Instale siguiendo las instrucciones del fabricante.
8. No instale cerca de fuentes de calor como radiadores, registros térmicos, estufas ni otros aparatos (incluidos amplificadores) que produzcan calor.
9. El conector del aparato es el dispositivo de desconexión de la corriente alterna y debe permanecer accesible después de la instalación.
10. No elimine el dispositivo de seguridad del enchufe conectado a tierra. Este aparato se debe conectar a un receptáculo con una conexión a tierra que sirva de protección.
11. Proteja el cable de alimentación para que nadie lo pise ni quede apretado, particularmente cerca de los enchufes, receptáculos de tomas múltiples y en el lugar en que sale del aparato.
12. Use solo aditamentos y accesorios especificados por Listen, Inc.
13. Use solo herramientas, soportes, plataformas y componentes vendidos junto con el aparato o vendidos por Listen, Inc.
14. Desconecte el aparato durante tormentas eléctricas o cuando no se vaya a utilizar durante largos períodos de tiempo.
15. Siempre que sea probable que se haya dañado el correcto funcionamiento o la seguridad de operación del aparato, se debe detener su funcionamiento y se debe bloquear para evitar una operación no deseada. Siempre que sea posible, se debe evitar cualquier ajuste, mantenimiento y reparación del aparato abierto mientras esté conectado a la red eléctrica; si no se puede evitar, solo personal de mantenimiento capacitado debe realizar esas tareas. Será necesaria la reparación del aparato cuando presente daños de cualquier tipo, por ejemplo si está dañado el cable de alimentación o el enchufe, si se derramó líquido o si cayeron objetos dentro del aparato, si este estuvo expuesto a la lluvia o a la humedad, si no funciona correctamente o si se ha caído.

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Manual

Símbolos de seguridad
El triángulo con el signo de exclamación se usa para indicar que se debe ser cuidadoso al operar el dispositivo o control cerca de donde se ubica el símbolo, o para indicar que la situación actual re-quiere del conocimiento o la acción del operador para evitar consecuencias no deseadas. Con este sím- bolo, se alerta al usuario sobre la existencia de instrucciones de operación y mantenimiento (servicio) importantes en este manual.
Disipador término y conexiones de salida ¡PRECAUCIÓN! Este producto está diseñado para un uso a corto plazo durante la prueba de altavoces. Las temperaturas de la superficie del disipador térmico trasero pueden superar los 60 °C en determinadas situaciones:
cuando las terminales de salida están conectadas a resistencias nominalmente menores a la carga de resistencia de salida nominal mínima de 4?;
cuando las terminales de salida entran involuntariamente en cortocircuito; cuando el producto se opera cerca de la potencia de salida nominal máxima a un ciclo
de trabajo que supera el 25 %; cuando el producto se opera a temperaturas ambiente cercanas a la temperatura
ambiente nominal máxima de 40 °C o a una temperatura mayor; cuando el producto se opera con una onda de salida entrecortada; cuando el producto está cargado con cargas distintas a las de un altavoz convencional
con una bobina de voz; cuando se produce una combinación de las situaciones mencionadas.
El usuario debe tomar precauciones para evitar lesiones personales y daños a objetos cercanos cuando el disipador térmico supere los 60 °C. Mantenga todos los cables y líneas lejos del disipador térmico para evitar que se produzcan daños por aislamiento.
Operar el producto en las condiciones mencionadas o con una temperatura en la superficie del disipador térmico que supere los 60 °C no dañará el producto.
ADVERTENCIA! -El símbolo del rayo está destinado a alertar al usuario de la presencia de “Voltaje peligroso” no aislado dentro del gabinete del producto que puede ser de suficiente magnitud como para constituir un riesgo de descarga eléctrica para las personas.

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AmpConnect 621TM

Manual

Listen Software License Agreement
READ THE TERMS AND CONDITIONS OF THIS LICENSE AGREEMENT CAREFULLY BEFORE INSTALLING THIS SOFTWARE. THE SOFTWARE IS COPYRIGHTED AND LICENSED (NOT SOLD). BY INSTALLING THIS SOFTWARE, YOU ARE ACCEPTING AND AGREEING TO THE TERMS OF THIS LICENSE AGREEMENT. IF YOU ARE NOT WILLING TO BE BOUND BY THE TERMS OF THIS LICENSE AGREEMENT, YOU SHOULD RETURN THE SOFTWARE, HARDWARE KEY, AND DOCUMENTATION WITHIN THIRTY (30) DAYS OF YOUR INVOICE DATE, AND YOU WILL RECEIVE A CREDIT OR A REFUND.
The enclosed Software is provided to the purchaser of the Software (“End- User”) by LISTEN, Inc., (“Licensor”) for use only under the terms set forth in this Agreement. Licensor reserves any right not expressly granted to the End- User. The End-User owns the disk on which the Software is recorded, but Licensor retains ownership of all copies of the Software itself. The End-User assumes sole responsibility for the installation, use and results obtained from use of the Software.
1. License. Licensor grants to End-User a limited, non-exclusive and nontransferable license to install, maintain and use the Software in object code form on a single computer owned or leased by End-User solely in connection with the End-User’s own business. End-User may make one copy of the Software, in machine-readable form, solely for backup or archival purposes for the computer on which the Software is installed. The Software is protected by copyright law. As an express condition of this License, the End-User must reproduce on the copy Licensor’s copyright notice and any other proprietary legends on the original copy supplied by Licensor.
2. Restrictions. End-User agrees that the Software is a proprietary product and that all right, title and interest in and to the Software, including all associated intellectual property rights, are and shall at all times remain with Licensor. End-User may NOT sublicense, assign, or distribute copies of the Software to others. THE END-USER MAY NOT DECOMPILE, REVERSE ENGINEER, DISASSEMBLE, OR OTHERWISE REDUCE THE SOFTWARE TO A HUMAN READABLE FORM. THE END-USER MAY NOT MODIFY, ADAPT, TRANSLATE, RENT, LEASE, LOAN, RESELL FOR PROFIT, DISTRIBUTE, OR OTHERWISE ASSIGN OR TRANSFER THE SOFTWARE, OR CREATE DERIVATIVE WORKS BASED UPON THE SOFTWARE OR ANY PART THEREOF.
3. Protection and Security. End-User agrees that the Software contains trade secrets, proprietary information and copyrighted material of Licensor. End- User agrees to use its best efforts and to take all reasonable steps to safeguard the Software to ensure that no unauthorized person shall have access thereto and that no unauthorized copy, publication, disclosure or distribution, in whole or in part, in any form, shall be made. End-User acknowledges that the Software contains valuable confidential information and that unauthorized use and/or copying are harmful to Licensor. End-User agrees to assist and cooperate with Licensor in the identification and removal of illegal copies of Listen software or software based on Listen’s source-code located on the End-User’s computer, computer system, or at End-User’s place of business. End-User agrees to only install and use authorized, genuine and licensed versions of the Software. Installation or use of any unlicensed or illegal copies, or software based on Listen’s source code shall be deemed a material breach of this Agreement.
4. Termination. This License is effective until terminated. This License will terminate immediately without notice from Licensor if the End-User fails to comply with any of its provisions. Upon termination the EndUser must destroy the Software and all copies thereof. End-User may terminate this License at any time by destroying the Software and all copies thereof.

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5. Limited Warranty. Licensor warrants that, for ninety (90) days from the date of shipment by Licensor (i) the media on which the software is furnished will be free of defects in materials and workmanship under normal use; and (ii) the Software conforms to its published functional specifications current at the time of shipment. Except for the foregoing, the Software is provided AS IS. If, during the warranty period, a defect appears, End-User shall return the Software to Licensor and Licensor’s only obligation shall be, at Licensor’s election, to replace the defective Software or refund the purchase price. The End-User agrees that the foregoing constitutes the End-User’s sole and exclusive remedy for breach by Licensor under any warranties made under this Agreement. This warranty does not apply if the Software (i) has been altered or changed in any way by anyone other than Licensor; (ii) has not been installed, operated, repaired or maintained in accordance with instructions supplied by Licensor (including the use of other Software versions) or (iii) has been subjected to abnormal physical or electrical stress, misuse, negligence or accident. Licensor is not responsible for problems associated with or caused by incompatible operating systems or equipment, or for problems in the interaction of the Software with software not furnished by Licensor.
No oral or written information or advice given by Licensor or its dealers, distributors, employees or agents shall in any way extend, modify or add to the foregoing warranty.
THE WARRANTY AND REMEDY PROVIDED ABOVE ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE END- USER ASSUMES ALL RISK AS TO THE SUITABILITY, QUALITY, AND PERFORMANCE OF THE SOFTWARE.
6. LIMITATION OF LIABILITY. IN NO EVENT WILL LICENSOR, OR ITS DIRECTORS, OFFICERS, EMPLOYEES, CONSULTANTS, INDEPENDENT CONTRACTORS, AGENTS OR AFFILIATES, BE LIABLE TO THE END-USER FOR ANY CONSEQUENTIAL, INCIDENTAL, INDIRECT, SPECIAL OR EXEMPLARY DAMAGES (INCLUDING DAMAGES FOR LOSS OF BUSINESS REVENUES OR PROFITS, BUSINESS INTERRUPTION, LOSS OF DATA OR BUSINESS INFORMATION, AND THE LIKE), HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, INCLUDING NEGLIGENCE, ARISING OUT OF THE USE OF OR INABILITY TO USE THE SOFTWARE OR ACCOMPANYING WRITTEN MATERIALS, EVEN IF LICENSOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
LICENSOR’S LIABILITY TO THE END-USER (IF ANY) FOR ACTUAL DIRECT DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, INCLUDING NEGLIGENCE, WILL BE LIMITED TO, AND IN NO EVENT SHALL EXCEED, THE AMOUNT ORIGINALLY PAID TO LICENSOR FOR THE LICENSE OF THE SOFTWARE.
7. Enhancements. From time to time Licensor may, in its sole discretion, advise the End-User of updates, upgrades, enhancements or improvements to the Software and/or new releases of the Software (collectively, “Enhancements”), and may license the End-User to use such Enhancements upon payment of prices as may be established by Licensor from time to time. All such Enhancements to the Software provided to the End-User shall also be governed by the terms of this License. IN ORDER FOR THE END-USER TO BE ASSURED THAT IT WILL BE ADVISED OF AND LICENSED TO USE ANY ENHANCEMENTS TO THE SOFTWARE, THE END-USER MUST REGISTER THEIR SOFTWARE AT www.listeninc.com/register.
8. Export Regulations. Software, including technical data, is subject to U.S. export control laws, including the U.S. Export Administration Act and its associated regulations, and may be subject to export or import regulations of other countries. End-User agrees to strictly comply with all such regulations and acknowledges that it has the responsibility to obtain licenses to export, re-export or import Software.

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9. General. This License will be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts and the United States, and shall inure to the benefit of Licensor and End-User and their successors, assigns and legal representatives. Any action, suit or proceeding arising out of under or in connection with this Agreement whether, brought for equitable relief or money damages shall be brought exclusively in either state or federal court in Suffolk County, Massachusetts. Licensee irrevocably and unconditionally submits to the exclusive jurisdiction and venue of such courts and agrees to take any and all future action necessary to submit to the jurisdiction of such courts. Final judgment in any such suit shall be conclusive and may be enforced in other jurisdictions by suit on the judgment, a certified or true copy of which shall be conclusive evidence of the fact and the amount of any liability therein described, or by appropriate proceedings under any applicable treaty or otherwise. If any provision of this License is held by a court of competent jurisdiction to be invalid or unenforceable to any extent under applicable law, that provision will be enforced to the maximum extent permissible and the remaining provisions of this License will remain in full force and effect. Any notices or other communications to be sent to Licensor must be mailed first class, postage prepaid, to the following address:
LISTEN, Inc.
580 Harrison Ave.,
Suite 3W,
Boston, MA 02118
This Agreement constitutes the entire agreement between the parties with respect to the subject matter hereof, and all prior proposals, agreements, representations, statements and undertakings are hereby expressly canceled and superseded. This Agreement may not be changed or amended except by a written instrument executed by a duly authorized officer of Licensor.
10. Acknowledgment. BY OPENING THIS PACKAGE AND/OR INSTALLING THIS SOFTWARE, THE END-USER ACKNOWLEDGES THAT IT HAS READ THIS LICENSE, UNDERSTANDS IT, AND AGREES TO BE BOUND BY ITS TERMS AND CONDITIONS. Should you have any questions concerning this License, contact Licensor at the address set forth above.

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LISTEN, Inc. 580 Harrison Ave., Suite 3W, Boston, MA 02118

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INDEX
A
Amplifier Calibration ………………………………………………. 17 Audio Devices – Windows 7 ……………………………………… 4 Audio Devices – Windows XP …………………………………… 4
B
Bit set to Write ……………………………………………………….. 30
C
Calibration …………………………………………………………….. 19 Calibration Configuration ………………………………………… 15 Calibration Sequence …………………………………………….. 18 Control ……………………………………………………………..21, 25 Custom Step ………………………………………………………….23
D
dB level …………………………………………………………………. 19 Digital I/O ………………………………………………………………. 27 Digital I/O General rules …………………………………………. 29
H
Hardware Configuration ……………………………………………9 Headphone Amplifier ……………………………………………… 18
I
IEPE ……………………………………………………………………… 21
L
Level …………………………………………………………………….. 18
M
Message Step ……………………………………………………….. 23 Microphone Calibration ………………………………………….. 18 Microphone manufacturer’s specifications ……………….. 18
R
Requirements ………………………………………………………….. 3
S
Self Test Sequence ………………………………………………… 16 Settling ………………………………………………………………….. 28 Sound pressure level ……………………………………………… 18 Specifications ……………………………………………………18, 19

T
Test Connections and Procedures ……………………………. 5 TTL Input ………………………………………………………………. 33

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AmpConnect 621TM Manual

Contact Information

Rev 042622

Contact the Listen office at 617-556-4104, Mon-Fri, 9am-5pm EST. or email: Sales – [email protected] Technical Support – [email protected]

Listen Website: www.listeninc.com/

© COPYRIGHT 2020 – 2021 LISTEN, INC. All rights reserved.
SoundCheck®, HarmonicTrakTM, STWEEPTM, SoundMapTM, NoiseCheckTM, SoundConnectTM, DC ConnectTM, AmpConnectTM, AmpConnect 621TM, AmpConnect ISCTM, SC AmpTM, SoundConnect 2TM, AudioConnectTM and AudioConnect 4x4TM are trademarks of Listen, Inc.

® Microsoft, Windows, Windows NT and Active X are registered trademarks of Microsoft Corporation. Pentium is a registered trademark of Intel Corporation. Test Stand and LabVIEW are trademarks of National Instruments Corporation. Oracle is a registered trademark of Oracle Corporation. ICP is a registered trademark of PCB Group. Bluetooth is a registered trademark of Bluetooth SIG.

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References

• Listen, Inc. - Electroacoustic Test and Audio Test & Measurement Systems

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