Leviton 41920-A70 User manual

41920-A70
User Manual

2
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.
THE TERMINALS MARKED WITH THIS SYMBOL ARE
HAZARDOUS LIVE. THE EXTERNAL WIRING TO THESE TERMINALS
REQUIRES INSTALLATION BY AN INSTRUCTED PERSON
!WARNING !
Leviton and Leviton Block & Design are trademarks of Leviton Manufacturing Co., Inc.
and are registered trademarks in many countries throughout the world.

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Table of Contents
IMPORTANT INSTRUCTIONS.............................................................................................................2
SAFETY INFORMATION......................................................................................................................2
Introduction...........................................................................................................................................4
Features............................................................................................................................................4
Package Contents.............................................................................................................................4
Panel Description..................................................................................................................................5
Front Panel........................................................................................................................................5
Rear Panel ........................................................................................................................................6
System Connection...............................................................................................................................7
Usage Precautions............................................................................................................................7
Audio Signal Connection...................................................................................................................7
Audio Output..................................................................................................................................7
Audio Inputs...................................................................................................................................8
System Operation.................................................................................................................................8
Front Panel........................................................................................................................................8
Audio Switching .............................................................................................................................8
Volume/EQ Control........................................................................................................................9
RS-232 Control...................................................................................................................................10
Settings ...........................................................................................................................................10
RS-232 Commands.........................................................................................................................10
Technical Support...............................................................................................................................12
Warranty .............................................................................................................................................12

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Introduction
The Leviton 41920-A70 Mixing Audio Amplifier is a 40 Watt (Class-D) power amplifier with either a
70V or 100V output. It has 2 stereo inputs (3.5mm and RCA), 1 digital audio fiber input and 1 MIC
input. It includes a priority muting (ducking) function, EQ control, MIC mixer, and supports 3 MIC
types (condenser, dynamic, and line audio input).
Features
Mono audio output at 40Watts
Supports 70V or 100V constant voltage output
RS-232 and IR control
Priority muting (ducking) function
16 ID codes for controlling separate amplifiers via RS-232
Supports condenser, dynamic, and wireless microphones
MIC port supports balanced and unbalanced signals
Two stereo audio inputs and one digital audio input (fiber)
Volume/Bass/Treble
Fast switching speed
Convection cooling so a fan is not needed
LED indicators for power and status
Package Contents
1 x Power Amplifier
2 x Mounting ears
4 x Screws
1 x Pluggable Terminal Block
1 x RS232 cable
1 x Power adapter (DC 24V)
4 x Plastic feet
1 x User Manual

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Panel Description
Front Panel
MIC
TREBLE
LINE
BASS
1
2
3MUTE
INPUT SEL
1 2 3
1. INPUT SELECT –1 is for the 2 RCA connectors, 2 is for the 3.5mm mini jack, and 3 is for the
optical audio digital audio input (fiber)
2. AUDIO CONTROL –Select the attribute to adjust with this button. Mic and Line adjusts
volume. Bass and Treble adjusts the low and high frequency response
3. ADJUST - To adjust or mute the corresponding audio
△: Adjust level up
▽: Adjust level down
MUTE: Mute the output of the selected input

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Rear Panel
1. POWER INDICATOR –Lights red when the power is connected
2. MICROPHONE INPUT –3-pole captive screw connector for microphone input, the switch
selects 48V (for condenser microphones), MIC (for dynamic microphones), and LINE for line
level input
3. 3.5MM INPUT –3.5mm mini jack for stereo audio input
4. ID CODE –16 codes range from 0 to F (hexadecimal) for RS-232 addressing
5. IR INPUT–Connects to an IR target to allow the use of an IR remote control
6. PORT POWER –Connects to the power adapter (24VDC)
7. RCA INPUT–L+R audio input
8. DIGITAL AUDIO INPUT –Connects to an optical digital audio output (PCM format only)
9. RS232 –3-pole captive screw connector for serial control
10. AUDIO OUTPUT –Connects with 70V or 100V speakers
1
2
3
4
5
6
7
8
9
10

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System Connection
Usage Precautions
1. DO NOT operate with an empty load
2. Speakers MUST be connected before applying power
Audio Signal Connection
Audio Output
COM 70V 100V
Speaker
(70V/10W)
Speaker
(70V/10W)
Speaker
(70V/10W)
Speaker
(70V/10W)

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Audio Inputs
Microphone input
MIC Selector Switch
48V When selected the MIC input will provide 48V phantom power for condenser
microphones
MIC When selected the MIC input is used for connecting with dynamic microphones and does
not supply 48V phantom power
LINE When selected the MIC input is used for connecting with line level audio sources or
wireless microphone outputs
Digital Audio Input
Used to connect with digital audio source devices
Notice: This digital audio input can support/decode PCM format signals only. If the CD/DVD is DTS
or AC3 format, please set the player to PCM format output before connecting
System Operation
Front Panel
Audio Switching
There are three switchable audio inputs; RCA input, 3.5mm input, and one digital audio (fiber) input.
These are switched via the input select button
MIC Selector Switch
Audio Source Selection:
1: RCA input
2: 3.5mm input
3: Digital audio (fiber) input

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Volume/EQ Control
The attribute that is selected via the Selection button is what is adjusted with the Adjustment buttons.
When MIC and LINE are selected it is the volume that is adjusted. When BASS and TREBLE are
selected it is the frequency response that is adjusted.
Adjustment:
△: Adjust level up
▽: Adjust level down
Selection Button

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RS-232 Control
Settings
Setting
Value
Baud Rate
9600
Parity
None
Data Bits
8
Stop Bits
1
Flow Control
None
RS-232 Commands
Command
Function Description
Feedback Code
1A1.
Switch the audio to input 1
A: 1 -> 1
2A1.
Switch the audio to input 2
A: 2 -> 1
3A1.
Switch the audio to input 3
A: 3 -> 1
0A0.
Mute Audio of MIC and Line out
Mute
1A0.
Mute audio of MIC
Mute MIC
2A0.
Mute audio of line out
Mute LIN
3A0.
Enable noise gate.
Gate On
4A0.
Disable noise gate.
Gate Off
0A1.
Unmute Audio
Unmute Audio
600%
Check status
A: 1 -> 1
Volume of MIC : 50
Volume of LINE : 50
Bass of LINE : 4
Treble of LINE : 4
Ducking Off