Leviton 41920-A01 Mixing Audio Amplifier User’s Manual

Leviton 41920-A01 Mixing Audio Amplifier

Introduction

Introduction to 41920-A01

The 41920-A01 is a compact-size digital amplifier (Class-D) with 3 inputs (2 line-in and 1 balanced MIC). It features a switchable bridged, dual-mono, or stereo output and has many other features that make it a perfect addition to a classroom or conference room application.

Package Contents

• QTY 1 41920 A01 Mixing Audio Amplifier
• QTY 1 24V Power supply
• QTY 1 RS 232 Cable
• QTY 1 U ser M annual
• QTY 4 Rubber Feet
• QTY 1 Instruction Sheet

Note： The IR remote and IR receiver are sold separately (41920-AIR).

Features

• 2x20Watt@4Ohm output.
• 1x40Watt@8Ohm bridged output
• Two stereo audio inputs
• Volume/Bass/Treble control
• MIC input can support a balanced or unbalanced signal
• 3.5mm jack Line audio output is volume controllable
• Dual-mono output switchable
• The microphone will be mixed into the line audio output, and be controlled separately
• MIC input supports 48V phantom power, dynamic MIC, and wireless MIC
• Auto noise gate monitors the audio and MIC input and will mute the output when there is no input detected

Specification

Audio Input

Input Connector

| QTY 2 RCA
QTY 1 3.5mm jack
QTY 1 captive screw connector
Input Impedance| >10KΩ
Audio Output

Output Connector

| QTY 1 3.5mm jack
QTY 1 captive screw connector (4P, 5.08mm)
Output Impedance| 50Ω/stereo, 4~8Ω/Amplifier
Audio General
Frequency Response| 20Hz ~ 20KHz
SNR| 80dB at maximum output
Stereo Channel Separation| >75dB@20Hz to 20KHz
Voltage Gain| 32dB
CMRR| >70dB@20Hz~20KHz
THD + Noise| 1%@1KHz, 0.3%@20KHz at nominal level
Power Output| 2×20 Watts (4 Ohms)
Control Function
RS232 Control| 3-position phoenix connector
IR Remote| Optional IR remote

System Connection

Audio Output

Default output: 2x20Watt@4Ohm

The default amplifier output is 2 x 20 watts into a 4-ohm load. The amplifier should be connected as pictured below:

Bridge connection: 1x40Watt@8Ohm

The amplifier can also be connected in a bridged configuration. This doubles the output power to 1 x 40 watts into 8 ohms. The inputs are summed to mono so either or both can be used. The Bridge connection is:

Dual-mono Output 2x20Watt@4Ohm

The amplifier can also be connected in a double-mono configuration. It sums the left and right channels to generate a mono audio output. The Mono connection is:

Loop Output

Variable line level output. Output level changes with the line volume control.

Microphone input

The microphone input has three modes and different modes use different connections:

48V phantom power input

With the switch set to “48V”, the microphone input will provide a 48V phantom power. This is typically used with condenser microphones.
Connect as follows: “+” connects to positive, “-” connects to negative, and “╧” connects to ground.

Note: Use with condenser microphones only.

MIC input

With the switch set to “MIC”, the microphone input is used to connect dynamic microphones.
Connect as follows: “+” connects to positive, “-” connects to negative, and “╧” connects to ground.

LINE input

With the switch set to “LINE”, the microphone input is used to connect with line-level audio or a wireless microphone output.
Connect as follows: “+” connects to positive, “-” connects to negative, and “╧” connects to ground.

Operation of the Control Panel and the IR Remote

Operation of the Control Panel

The buttons on top of the unit provide control of volume, EQ, and input switching. 5.1.1. Input switching
There are two switchable stereo audio inputs, one stereo RCA input, and one stereo 3.5mm jack input, switchable through the buttons as below:

Volume/EQ control

The line volume and MIC volume can be controlled by the arrow buttons. The MIC Volume, LINE volume, bass level, and treble level are selected first and then controlled with the arrow buttons. See the picture below:

Usage of the IR Remote (SOLD SEPARATELY)

Communication Protocol and Command Codes

Communication Protocol : RS232 Communication Protocol

• Baud rate : 9600
• Data bit : 8
• Stop bit : 1

600%

|

Checking the status

| A: 1 -> 1
Volume: 30
Bass: 00
Treble: 00
601%| MIC volume up| The volume of MIC: 51
602%| MIC volume down| The volume of MIC: 51
603%| Line volume up| Volume of LINE: 51
604%| Line volume down| Volume of LINE: 51
605%| Bass level up| Bass of LINE: 04
606%| Bass level down| Bass of LINE: 04
607%| Treble level up| The treble of LINE: 04
608%| Treble level down| The treble of LINE: 04

609%

|

Initialization, back to the default setting

| A: 1 -> 1
Volume: 50
Bass: 04
Treble: 04

5xx%

| Preset MIC volume, xx ranges from 00 to

|

The volume of MIC: 50

61 steps in total.

7xx%

| Preset line volume, xx ranges from 00 to 60.|

The volume of LINE: 50

---|---|---
61 steps in total.

8xx%

| Preset the bass level, xx ranges from 00 to

|

Bass of LINE: 04

9 steps in total.

9xx%

| Preset the treble level, xx ranges from 00 to

|

The treble of LINE: 04

9 steps in total.

1: Any dot “.” after the letters are part of the command.

• Example 1: Switching to Input 2, the RS232 command is: 2A1.
• Example 2: Turning up the volume of the line audio, the RS232 command is: 603%
• Example 3: Set the MIC volume to “21”, the RS232 command is: 521%
• Example 4: Checking the working status of the amplifier, the RS232 command is: 600%

Troubleshooting & Maintenance

1. When there is no output audio:

   • Check if there is any signal at the input.
     The signal can be verified by using an oscilloscope or a multimeter. If there is no signal at the input, it may be that the input cable is broken or the connectors are loose. Check the connectors and, if necessary, change out the cable.

   • Check if there is any signal at the output.

   • Verify that the correct input is chosen.

2. If the POWER indicator LED is not illuminated make sure the power cord is plugged in.

Safety

IMPORTANT INSTRUCTIONS

1. Read and understand all instructions. Follow all warnings and instructions marked on the product.
2. Do not use this product near water-e.g., near a tub, wash basin, kitchen sink or laundry tub, in a wet basement, or near a swimming pool.
3. Never push objects of any kind into this product through openings, as they may touch dangerous voltages.
4. SAVE THESE INSTRUCTIONS.

SAFETY INFORMATION

1. Never install communications wiring or components during a lightning storm.
2. Never install communications components in wet locations unless the components are designed specifically for use in wet locations.
3. Never touch uninsulated wires or terminals unless the wiring has been disconnected at the network interface.
4. Use caution when installing or modifying communications wiring or components.

After-sales Service

For any questions email Leviton at: appeng@leviton.com.

Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

CAN ICES-3(B)/NMB-3(B)

Industry Canada Class B emission compliance statement. This Class B digital apparatus complies with Canadian ICES-003.

Contact Information

• www.leviton.com
• DI-040-41920-25A

FAQ’S

What is a Mixing Audio Amplifier?

A mixing audio amplifier is a device that can combine audio signals (mix them) from different sources and amplify (increase) the power of the combined signal before sending it to speakers.

How do I control the volume and tone on the Leviton 41920-A01?

Most amplifiers include knobs or sliders that allow you to adjust various aspects of the sound, such as volume, bass, and treble. The specific controls would depend on the model.

How should I position the Leviton 41920-A01 in my setup?

Ensure it's on a flat surface, away from direct sunlight or heat sources. Providing space around the amplifier will allow for proper ventilation and avoid overheating.

Can I connect both dynamic and condenser microphones to the amplifier?

This depends on the amplifier's design. Some amplifiers can handle both, while others may require an external power source or phantom power for condenser microphones.

Is the Leviton 41920-A01 compatible with both passive and active speakers?

Typically, an amplifier is designed to power passive speakers. Active speakers have their own built-in amplifier. Connecting an external amplifier to active speakers can damage them unless the setup specifically allows for it.

What type of maintenance does the amplifier require?

Most amplifiers are relatively low-maintenance. However, it's a good practice to keep them free of dust, ensure they're well-ventilated, and avoid spilling liquids on them.

Can I use headphones with this amplifier?

If the amplifier has a dedicated headphone output, then yes. Remember that the signal strength meant for speakers can damage headphones if plugged into the wrong output.

How do I reset the Leviton 41920-A01 to its factory settings?

Resetting to factory settings would generally involve following a specific sequence detailed in the user manual. If not specified, contacting the manufacturer's support may be the best approach.

Can I connect a subwoofer to the Leviton 41920-A01?

If the amplifier has a dedicated subwoofer output or if it fits within the system's capabilities, then you should be able to connect a subwoofer.

How do I register my Leviton 41920-A01 for warranty or support?

The process would typically involve completing a form on the manufacturer's website or mailing in a registration card that comes with the product.

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