Listen AmpConnect 621 USB Controlled Multichannel Test Interface User Manual
- June 10, 2024
- LISTEN
Table of Contents
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:
-
Connect the XLR-3 inputs to the audio source.
-
Connect the BNC digital outputs to the measuring
equipment. -
Connect the USB Type-B port to the PC.
-
Connect the DB-9 connector to the digital I/O device.
-
Connect the IEC power connector to the AC power source.
-
Install SoundCheck software version 11 or later on the PC.
Usage:
-
Ensure that the AmpConnect 621TM is properly connected and the
AC power source is turned on. -
Launch the SoundCheck software on the PC.
-
Select the AmpConnect 621TM as the audio interface device in
the SoundCheck software. -
Configure the input and output settings in the SoundCheck
software. -
Start the test measurement procedure using the SoundCheck
software. -
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.
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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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Hardware and Calibration
11
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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Hardware and Calibration
AmpConnect 621TM Manual
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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Hardware and Calibration
13
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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Hardware and Calibration
AmpConnect 621TM Manual
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.
AmpConnect 621TM Manual
Hardware and Calibration
15
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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Hardware and Calibration
AmpConnect 621TM Manual
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.
AmpConnect 621TM Manual
Hardware and Calibration
17
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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Hardware and Calibration
AmpConnect 621TM Manual
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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Hardware and Calibration
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AmpConnect 621TM Manual
Hardware and Calibration
20
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
AmpConnect 621TM Manual
AmpConnect 621 Message Step
21
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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AmpConnect 621 Message Step
AmpConnect 621TM Manual
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
AmpConnect 621TM Manual
USB Control Via SoundCheck
23
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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USB Control Via SoundCheck
AmpConnect 621TM Manual
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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USB Control Via SoundCheck
AmpConnect 621TM Manual
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.
AmpConnect 621TM Manual
Digital I/O Operation
27
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 Operation
AmpConnect 621TM Manual
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)
AmpConnect 621TM Manual
Digital I/O Operation
29
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 Operation
AmpConnect 621TM Manual
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
AmpConnect 621TM Manual
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
32
Digital I/O Operation
AmpConnect 621TM Manual
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”.
AmpConnect 621TM Manual
Digital I/O Operation
Figure 7-16: Jump On Fail
33
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
34
Digital I/O Operation
AmpConnect 621TM Manual
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
36
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%.
AmpConnect 621TM Manual
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
38
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
AmpConnect 621TM Manual
Equipment Ratings and Approvals
39
CE Declaration of Conformity
40
Equipment Ratings and Approvals
AmpConnect 621TM Manual
UK Declaration of Conformity
AmpConnect 621TM Manual
Equipment Ratings and Approvals
41
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42
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.
AmpConnect 621TM Manual
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.
44
Important Safety Information
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.
AmpConnect 621TM
Vigtige sikkerhedsforskrifter og symbolforklaringer
45
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.
46
Vigtige sikkerhedsforskrifter og symbolforklaringer
AmpConnect 621TM
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.
AmpConnect 621TM
Explications Importantes des Symboles et des Précautions de Sécurité
47
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.
48
Explications Importantes des Symboles et des Précautions de Sécurité
AmpConnect 621TM
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.
AmpConnect 621TM Wichtige Sicherheitsvorkehrungen und Symbol-erklärungen
49
Manual
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.
50
Wichtige Sicherheitsvorkehrungen und Symbol-erklärungen AmpConnect 621TM
Manual
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.
AmpConnect 621TM
Información de Seguridad y Símbolos
51
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.
52
Información de Seguridad y Símbolos
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
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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
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with Licensor. End-User may NOT sublicense, assign, or distribute copies of
the Software to others. THE END-USER MAY NOT DECOMPILE, REVERSE ENGINEER,
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acknowledges that the Software contains valuable confidential information and
that unauthorized use and/or copying are harmful to Licensor. End-User agrees
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any time by destroying the Software and all copies thereof.
AmpConnect 621TM Manual
Listen Software License Agreement
53
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
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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
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USER ASSUMES ALL RISK AS TO THE SUITABILITY, QUALITY, AND PERFORMANCE OF THE
SOFTWARE.
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OFFICERS, EMPLOYEES, CONSULTANTS, INDEPENDENT CONTRACTORS, AGENTS OR
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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.
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HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, INCLUDING
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advise the End-User of updates, upgrades, enhancements or improvements to the
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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
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AmpConnect 621TM Manual
Listen Software License Agreement
54
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
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or in connection with this Agreement whether, brought for equitable relief or
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Suite 3W,
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This Agreement constitutes the entire agreement between the parties with
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10. Acknowledgment. BY OPENING THIS PACKAGE AND/OR INSTALLING THIS SOFTWARE,
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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.
AmpConnect 621TM Manual
Listen Software License Agreement
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AmpConnect 621TM Manual
Listen Software License Agreement
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LISTEN, Inc. 580 Harrison Ave., Suite 3W, Boston, MA 02118
AmpConnect 621TM Manual
Listen Software License Agreement
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AmpConnect 621TM Manual
Listen Software License Agreement
58
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
AmpConnect 621TM Manual
INDEX
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INDEX
AmpConnect 621TM Manual
Contact Information
Rev 042622
Contact the Listen office at 617-556-4104, Mon-Fri, 9am-5pm EST. or email: Sales – sales@listeninc.com Technical Support – support@listeninc.com
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.
AmpConnect 621TM Manual
61