AVGear AVG-MA3 User manual

AVG-MA3
The
MA3
is a 40W power amplifier (Cl
ass
-
D) with selectable 70V or 100V line output.
Features
Mono audio output at 40Watts.
Switchable between 70V and 100V.
Audio Ducking function.
16 ID codes for controlling different
AVG-MA3 amplifiers.
3-level MIC input, supports condenser
microphone, dynamic microphone and
wireless microphone (Line Level)
MIC port can support balanced or
unbalanced signal.
Two stereo audio inputs and one
digital audio input, switchable by panel
button, IR remote & RS232.
Volume/Bass/Treble controllable by
panel buttons, IR remote & RS232.
Convection cooled, fan is not needed
allowing for quiet running.
LED indicator, for power indication
and working status.
Antistatic case design to provide RF
Shielding for long-term, stable
performance.


AVG-MA3
PLEASE READ THIS PRODUCT MANUAL CAREFULLY
BEFORE USING THIS PRODUCT.
This manual is only for operation instruction only, and
not to be used in a maintenance capacity. The
functions described in this version are current as at
March 2015. Any changes of functions and
operational parameters will be updated in future
manual versions. Please refer to your dealer for the
latest product details.
Version 1.0 1/3/15

AVG-MA3
SAFETY OPERATION GUIDE
In order to guarantee the reliable operation of the equipment and safety of the
user, please abide by the following procedures in installation, use and
maintenance:
1. The system must be earthed properly. Please do not use two blade plugs
and ensure the alternating power supply ranges from 100v to 240v and from
50Hz to 60Hz.
2. Do not install the switcher in an environment where it will be exposed to
extreme hot or cold temperatures.
3. This unit will generate heat during operation, please ensure that you allow
adequate ventilation to ensure reliable operation.
4. Please disconnect the unit from mains power if it will be left unused for a
long time.
5. Please DO NOT try to open the casing of the equipment, DO NOT attempt to
repair the unit. Opening the unit will void the warranty. There are high
voltage components in the unitand attempting to repair the unit could result
in serious injury.
6. Do not allow the unit to come into contact with any liquid as that could result
in personal injury and product failure.

AVG-MA3
TABLE OF CONTENTS
Introduction ..............................................................................................................1
Introduction to the ........................................................................................1.1
System Applications.....................................................................................1.2
Features.......................................................................................................1.3
What’s in the Box.....................................................................................................2
Connecting the AVG-MA3........................................................................................3
Introduction to the Front Panel .....................................................................3.1
Introduction to the Rear Panel......................................................................3.2
Connection Diagram.....................................................................................3.3
Audio Signal Connection..............................................................................3.4
Audio Output...................................................................................3.4.1
Audio Inputs....................................................................................3.4.2
Usage Precautions.......................................................................................3.5
Operating the AVG-MA3 ..........................................................................................4
Operation of the Front Panel........................................................................4.1
Audio Switching..............................................................................4.4.1
Volume/EQ Control.......................................................................................4.2
Operating the IR Remote..............................................................................4.3
Operations with 3rd Party Control Software .................................................4.4
Connection with a Computer...........................................................4.4.1
Connection of RS232 Port..............................................................4.4.2
RS232 Communication Commands................................................4.4.3
Specifications...........................................................................................................5
Panel Drawing..............................................................................................5.1
Troubleshooting & Maintenance.............................................................................6

AVG-MA3
1. Introduction
1.1. Introduction to the AVG-MA3
AVG-MA3 is a 40 Watt power amplifier (Class-D) with a selectable 70V or 100V line
output. It has 2 stereo inputs (1x3.5mm jack for line in, 2xRCA for L&R), 1 digital
input & 1 balanced MIC. It is integrated with powerful functions, including audio
ducking, EQ control, MIC mixer etc, and MIC input supports 3 levels with condenser
MIC, dynamic MIC & Line audio input.
There a two main voltages, 70V and 100V used for different countries, with the AVG-
MA3 designed to integrate with both voltages.
1.2. System Applications
AVG-MA3 is a flexible small footprint amplifier finding applications in classrooms,
small meeting rooms, lecture halls, bars and hotels etc.
1.3. Features
Mono audio output at 40Watts.
Switchable between 70V and 100V.
Audio Ducking function.
16 ID codes for controlling different AVG-MA3 amplifiers.
3-level MIC input, supports condenser microphone, dynamic microphone and
wireless microphone (Line Level)
MIC port can support balanced or unbalanced signal.
Two stereo audio inputs and one digital audio input, switchable by panel button,
IR remote & RS232.
Volume/Bass/Treble controllable by panel buttons, IR remote & RS232.
Fast switching speed.
Convection cooled, fan is not needed allowing for quiet running.
LED indicator, for power indication and working status.
Antistatic case design to provide RF Shielding for long-term, stable performance.

AVG-MA3
2. What’s in the Box
1 x AVG-MA3
1 x Power adapter (DC 24V)
1 x Power Cord
2 x Mounting ears (separate from AVG-MA3)
1 x RS232 cable including Phoenix Connector
4 x Screws
4 x Plastic Feet
1 x User manual
Options:
1 x IR remote (not included, available separately)
1 x IR receiver (not included, available separately)
Note: Please confirm if the product and the accessories are all included, if not,
please contact your dealer.

AVG-MA3
3. Connecting the AVG-MA3
3.1. Introduction to the Front Panel
Front Panel
No.
Name
Function
① Audio Input
Selection
To select the input audio source, after choosing the audio
source, the corresponding LED indicator will be on. No.1 is for
dual mono audio input (2 RCA connectors for L&R), No.2 is for
stereo audio input (3.5mm mini jack), and No.3 is for digital
optical audio input.
②
Audio
Control Adjust the volume of the MIC, Line, or the level of Bass and Treble with this button.
③
Volume
Adjustment
To turn up/down or mute the corresponding audio.
: Turn down the volume
: Turn up the volume
MUTE: Mute the output

AVG-MA3
3.2. Introduction to the Rear Panel
Rear Panel
No.
Name
Function
①
Power
Indicator Indicates red when power is on.
②
Microphone
Input Port
3-pole captive screw connector for microphone input, the
slide switch to the right is to select the microphone input type,
including 48V (for condenser microphone), MIC (for dynamic
microphone) and LINE (for line audio).
③
Audio
Inputs 3.5mm mini jack for stereo audio input, it can be connected with an audio source device such as DVD player.
④
ID Code 16 codes range from 0 to F (hexadecimal), works together
with the PC control software.
⑤
IR Port To connect with the IR receiver, works together with the IR
remote.
⑥
Power Port To connect with the power adapter (DC24V).
⑦
2 x RCA Dual-mono audio input, which can be connected with an
Audio source device such as a PC.
⑧
Digital
Audio
Input
Optical connector for digital audio input (PCM format), it can
be connected to a device’s optical port, such as a blue-ray
player.
⑨
RS232
3-pole captive screw connector for serial control, it can be
connected with a PC (Use a 3-pole captive to 9 pin female D
connector and serial control software) to control the AVG-
MA3.
⑩
Audio
Output To connect to 70V or 100V Speakers.

AVG-MA3
3.3. Connection Diagram

AVG-MA3
3.4. Audio Signal Connection
3.4.1. Audio Output
AVG-MA3 supports mono audio output, and the output voltage is 70V or alternatively
100V. With its dual-purpose design, it can be used for driving both common
standards. The end ‘COM’ connector is for grounding. The AVG-MA3 amplifier has a
mono audio output with a rated power at 40Watts, so the AVG-MA3 can be
connected with several speakers in parallel connection.
(Total power mustn’t exceed 40Watts).
The following figure shows us how to connect with the speakers. Here we take the
speakers 10Watt@8Ohms each as example.
40W Power Amplifier
Audio Output Connection
3.4.2. Audio Inputs
AVG-MA3 provides us with 2 stereo audio inputs, one microphone input and one
digital optical audio input. The following figure shows the audio input ports.
Slide Switch, to select the MIC input mode,
includes MIC (dynamic microphone), 48V
(condenser microphone) and LINE (normal
line audio or wireless microphone).

AVG-MA3
Audio Input Ports
48V Phantom Power Input
With the switch selected to “48V” the MIC input will provide 48V phantom power.
This is usually used for powering for condenser microphones, Connection is:
“+” connects to positive, “-” connects to negative and “ ” to ground
Note: In this mode, only condenser microphones can be connected.
MIC Input
With the switch selected to “MIC” the microphone input is used for connecting
with a dynamic microphone. There are two different connections:
a. Unbalanced connection:
“+” and “ ” connect to ground, and “-” connects to signal
“-” and “ ” connect to ground, and “+” connects to signal
b. Balanced connection: “+” connects to positive, “-” connects to negative and
“ ” connects to ground
LINE Input
With the switch selected to “LINE” the microphone input is used for connecting
with normal audio or wireless microphone output (line level). There are two
different connections:
a. Unbalanced connection: “+” and “ ” connect to ground, and “-” connects to
signal. “-” and “ ” connect to ground, and “+” connects to signal
b. Balanced connection: “+” connects to positive, “-” connects to negative and
“ ” connects to ground
Digital Audio Input
AVG-MA3 provides an optical port to connect with digital audio sources. With the
SPF optical port the audio signal can be transmitted faster, more reliably and can
be transmitted over a long distance without distortion.
Note: This digital audio input can support/decode PCM format signal only. If the
CD/DVD is DTS or AC3 format, please set the player to PCM format output
before connecting it to the AVG-MA3.

AVG-MA3
3.5. Usage Precautions
1. Amplifier Output must be connected to Load.
2. Speakers must be connected before unit is powered on.

AVG-MA3
4. Operating the AVG-MA3
4.1. Operation of the Front Panel
The front buttons control volume/EQ control and switching. The LED indicator will
show the connection status. The following content introduces audio switching and
EQ control in detail.
Operations: Press the corresponding button again for cyclic switching.
4.1.1. Audio Switching
There are three switchable audio inputs, one 2xRCA input, one 3.5mm jack input,
and one digital optical audio input, switchable through the buttons as below:
Audio Source Selection Button
4.2. Volume/EQ Control
The line volume and MIC volume can be controlled by the buttons.
The MIC Volume/LINE volume/LINE bass/LINE treble will be selected by the buttons,
and controlled up/down/mute by the function buttons. Please check the picture
below:
Audio Mode and Volume Adjustment Buttons
For example, to turn up the line volume, you should select the “LINE” first, and then
press the button “ ”.
Audio Source Selection:
1: Dual mono audio
2: Stereo audio
3: Digital optical audio
Volume Adjustment:
▽
▽▽
▽: Turn down the volume
△
△△
△: Turn up the volume
MUTE: Mute the output
Audio Mode Switching

AVG-MA3
4.3. Operating the IR Remote
AVG-MA3 includes an IR port for use with the IR Receiver and the IR remote
allowing the user to control the AVG-MA3 remotely.
Note: The IR Receiver and the IR remote are purchased separately.
IR Remote
IR Receiver
Audio Source Selection:
1: 2 RCA dual-mono audio
input
2: 1 3.5mm jack
3: 1 Digital optical audio input
Use to transmit the
infrared signal sent by
the remote controller.
Mute Mode:
MIC: Mute the
microphone volume
LINE: Mute the line
volume
SPEAKER: Unmute
Audio Controlling Modes:
MIC: Turn up/down the
microphone volume
LINE: Turn up/down the
line volume
BASS: Bass tuning
TREBLE: Treble of line
volume
The IR receiver works
together with the IR
remote. Please point the
IR remote at the IR
receiver to control the
MA2.
3.5mm jack
inserts into the
IR 3.5mm socket
to connect the IR
Receiver.

AVG-MA3
4.4. Operating with 3rd Party Control Software
4.4.1. Connection with a Computer
When the Amplifier is connected via the RS232 port to either a computer or 3rd party
processor it is able to be controlled using RS232 String commands.
To connect the amplifier, users should use the 3-pole male captive screw to 9-pin D
female connector (supplied).
4.4.2. Connection of RS232 Port
This RS-232 communication port is a female 9-pin D connector. The definition of its
pins is as per the table below.
No.
Pin
Function
1 N/C Unused
2 Tx Transmit
3 Rx Receive
4 N/C Unused
5 Gnd Ground
6 N/C Unused
7 N/C Unused
8 N/C Unused
9 N/C Unused

AVG-MA3
4.4.3. RS232 Communication Commands
Communication Protocol: RS232 Communication Protocol
Baud rate: 9600 Data bit: 8 Stop bit: 1 Parity bit: none
Command
Function Description
Feedback Code
1A1. Switching the audio to input 1 A: 1 -> 1
2A1. Switching the audio to input 2 A: 2 -> 1
3A1. Switching 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
0A1. Unmute Audio Unmute Audio
600% Checking the working status
A: 1 -> 1
Volume of MIC : 50
Volume of LINE : 50
Bass of LINE : 4
Treble of LINE : 4
Ducking Off
601% MIC volume up Volume of MIC: 51
602% MIC volume down 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: 4
606% Bass level down Bass of LINE: 4
607% Treble level up Treble of LINE: 4
608% Treble level down Treble of LINE: 4
609% Initialization, back to the default setting Init OK
610% Enable/disable the ducking function. Ducking off/Ducking on
4[x][x]% Preset the volume level of ducking function. [xx] arranges from [00] to [60].
61 degrees in total. Ducking of LINE: 50
5[x][x]% Preset MIC volume, [xx] arranges from
[00] to [60]. 61 degrees in total. Volume of MIC: 50
7[x][x]% Preset line volume, [xx] arranges from
[00] to [60]. 61 degrees in total. Volume of LINE: 50
8[x][x]% Preset the bass level, [xx] arranges from
[00] to [08]. 9 degrees in total. Bass of LINE: 4
9[x][x]% Preset the treble level, [xx] arranges
from [00] to [08]. 9 degrees in total. Treble of LINE: 4

AVG-MA3
Notes:
1. The letter inside the bracket [ ] is the variable code, which is changeable.
2. The bracket symbol [ ] is not to be used in the RS232 string commands.
3. Any dot “.” after the letters is part of the commands.
4. Ducking function:
When MIC audio is sensed, the volume of the line audio will be automatically
dimmed to the preset volume level, if there is no input MIC audio signal after 5
seconds, then the volume will be automatically turned up to the original level. If
you need to disable/enable the ducking function, just send the command “610%”
again.
5. ID coding:
The ID codes of AVG-MA3 ranges from 0 to F (hexadecimal), when sending
RS232 commands, please take notice of the address of the ID code.
If the address of the ID code is 0, any RS232 command is available.
If the address is in 1~F, it has one unique ID code (If the ID code is not the same
with the address, no RS232 command will work).
While the ID code is in 1~F, please add “ID/” before sending the command.
For example, if the ID code is 5, the RS232 command needed is “604%”, the
correct command is in this format: 5/604%.
There is no need to add “ID/” before the command when the ID code is 0.
Examples:
1. Switching the input 2 to the line out, the command is: 2A1.
2. Turning up the volume of line audio, the command is: 603%
3. Preset the MIC volume to “21” degree, the command is: 521%
4. Checking the working status of AVG-MA3, the command is: 600%
5. If the ID code is 0, sending command 601% is able to turn up the MIC volume. If
the ID code is 2, sending command 601% will not work, and the MIC volume
remains unchanged. The right command is 2/601%.

AVG-MA3
5. Specifications
Audio Input
Audio Output
Input
2
stereo audio
1MIC
1 Digital optical
audio
Output 1 mono amplifier
Input Connector
2
RCA
13.5mm jack
13-pole 3.81mm
captive screw
connector
1SPF optical
connector
Output Connector
13-pole 3.81mm
captive screw
connector
Input Impedance >10KΩOutput Type Constant voltage
70V or 100V
Audio General
Frequency
Response 120Hz ~ 20KHz CMRR >70dB@20Hz ~20KHz
SNR 80dB (Max) Bandwidth 120Hz ~ 20KHz
Rated Power
Output 40Watt @8Ohms THD + Noise 1%@1KHz,
0.3%@20KHz at
nominal level
Voltage Gain 26dB
Control Function
RS232 Control
1
3-pole 3.81mm
captive screw
connector
Front Panel
Control Buttons
ID Code Control 16 ID codes for control
Optional IR remote & TCP/IP controlled by PTNET(PTN's
programmable interface)
General
Temperature -20 ~ +70
℃
Humidity 10% ~ 90%
Power Supply DC 24V power
adapter Power Consumption 5W
Case Dimension W153 x H44 x
D144mm (1U high)
Product Weight 0.86Kg

AVG-MA3
5.1. Panel Drawing

AVG-MA3
6. Troubleshooting & Maintenance
1. When there is no output audio:
Check if there is any signal at the input.
Check if there is any signal at the output.
We can check these by using an oscilloscope or a multimeter. If there is no signal
at the input/outputs please check input/output cables and replace if necessary.
Check if the output port number is the same with the controlled one.
If not the problem mentioned above the unit may have a pre existing fault.
2. If the POWER indicator doesn’t work or respond to any operation, please check
and make sure the power cord connection is good.
3. If the output sound has interferance, please make sure the system is grounded
well.
4. If the static becomes stronger when connecting the audio connectors, it probably
due to bad grounding, please check the grounding and make sure it connected
well, otherwise it wcan damage the amplifier.
5. If the AVG-MA3 amplifier cannot be controlled by the keys on the front panel,
RS232 port or the IR remote, the unit may have an existing fault. Please return to
your dealer for testing.