ALFAtron PA100V User manual

40W Power Amplifier

40W Power Amplifier
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Safety Operation Guide
In order to guarantee the reliable operation of the equipment and safety of the staff,
please abide by the following in installation, using and maintenance:
1) The system must be earthed properly. Please do not use two blade plugs and
ensure the alternating power supply ranged from 100v to 240v and from 50Hz to
60Hz.
2) Do not put the switcher in extreme temperatures.
3) As the power generates heat when running, the working environment should be
maintained with good ventilation, in case of damage caused by overheating.
4) Please turn off the general power switch in humid weather or if left unused for long
periods of time.
5) Before following operation, ensure that the alternating current wire is pull out of the
power supply:
Take off or reship any components of the equipment.
Take off or rejoin any pin or other link of the equipment.
6) As to non-professional or without permission, please DO NOT try to open the casing
of the equipment, DO NOT repair it on your own, in case of accident or increasing
the damage of the equipment.
7) DO NOT splash any chemicals or liquid onto the equipment.
8) NOTICE: Please read this user manual carefully before using this product. Pictures
shown in this manual are for reference only, different model and specifications are
subject to real product.
This manual is for operation instruction only, not for any maintenance usage. Any
changes of functions and parameters will be informed separately. Please refer to
the dealers for the latest details.
All rights reserved. No part of this publication may be copied or reproduced
without permission.

40W Power Amplifier
Table of Contents
1. Introduction.................................................................................................................1
1.1 Introduction to PA100V Power Amplifier............................................................1
1.2 Features ............................................................................................................1
1.3 Package Contents .............................................................................................1
2. Panel Description........................................................................................................2
2.1 Front Panel........................................................................................................2
2.2 Introduction of Rear Panel.................................................................................3
3. System Connection.....................................................................................................4
3.1 Usage Precautions ............................................................................................4
3.2 System Diagram................................................................................................4
3.3 Audio Signal Connection....................................................................................4
3.3.1 Audio Output............................................................................................4
3.3.2 Audio Inputs.............................................................................................5
3.4 System Applications...........................................................................................6
4. System Operations .....................................................................................................6
4.1 Operations of Front Panel..................................................................................6
4.1.1 Audio switching........................................................................................6
4.1.2 Volume/EQ controlling.............................................................................7
4.2 Operations of IR Remote...................................................................................7
4.3 Operations of Control Software .........................................................................8
4.3.1 Connection with Computer ......................................................................8
4.3.2 Installation/uninstallation of RS232 Control Software..............................8
4.3.3 Running Environment..............................................................................9
4.3.4 Function Settings.....................................................................................9
4.3.5 RS232 Communication Commands ......................................................10
5. Specifications............................................................................................................12
6. Panel Drawing ..........................................................................................................13
7. Troubleshooting and Maintenance............................................................................14
8. After-sales Service....................................................................................................15

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1. Introduction
1.1 Introduction to PA100V Power Amplifier
PA100V Power Amplifier is a 40W Power Amplifier (Class-D) with output alternatively at
70V or 100V. 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 ducking
function, EQ control, MIC mixer etc, and MIC input supports 3 levels with condenser
MIC, dynamic MIC & line audio input.
As for power amplifier we have normally voltages at 70V and 100V for different
countries, but PA100V is designed to integrate with both voltages to meet different
requirements.
1.2 Features
Mono audio output at 40Watt.
Switchable between 70V and 100V.
Ducking function.
16 ID codes for controlling between different PA100V amplifiers.
3-level MIC input, supports condenser microphone, dynamic microphone and
wireless microphone.
MIC port can support balance/unbalance signal, suppress the external noise
effectively.
Two stereo audio inputs and one digital audio input, switchable by button, IR remote
& RS232.
Volume/Bass/Treble controllable by buttons, IR remote & RS232.
Fast switching speed for good performance.
Convection cooler, fan is not needed.
LED indicator, for power and working status.
Antistatic case design to provide good protection for long-term and stable
performance.
1.3 Package Contents
1 x PA100V Power Amplifier
2 x Mounting ears (separate from PA100V Power Amplifier)
4 x Screws
1 x Pluggable Terminal Block
1 x RS232 cable
1 x Power adapter (DC 24V)

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1 x Power Cord
4 x Plastic Cushions
1 x User manual
Note: Ensure the product and the accessories are all included, if not, please contact
the dealers.
2. Panel Description
2.1 Front Panel
Figure 1 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 RCAconnectors for L&R), No.2
is for stereo audio input (3.5mm mini jack), and No.3 is for
digital fiber 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

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2.2 Rear Panel
Figure 2 Rear Panel
No.
Name
Function
①
Power
Indicator
Turns red when power on.
②
Microphon
e input port
3-pole captive screw connector for microphone input, the dial
switch in right side is to select the micro input kind, 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 to
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
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 audio
source device such as a PC.
⑧
Digital
Audio Input
Fiber connector for digital audio input (PCM format only), it can
be connected with a device with fiber port, such as blue-ray
player.
⑨
RS232
3-pole captive screw connector for serial control, it can be
connected with PC (Use a 3-pole captive to 9 pin female D
connector and serial control software) to control PA100V
Power Amplifier.
⑩
Audio
Output
To connect with audio output devices, such as speakers (To
select 70V or 100V depends on the input voltage of the
speakers). COM is for grounding (GND).

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3. System Connection
3.1 Usage Precautions
1) Do not use this without having load ( speakers) connected.
2) Speakers must be connected before power on.
3.2 System Diagram
Figure 3 System Diagram
3.3 Audio Signal Connection
3.3.1 Audio Output
PA100V Power Amplifier supports mono audio output, and the output voltage is 70V or
100V. The end COM is for grounding. The amplifier to be connected is mono audio
output with a rated power at 40Watt, so PA100V Power Amplifier can be connected with
several speakers in parallel connection(Total power mustn’t be more than 40Watt).
The following figure shows us how to connect the speakers. Here we take the
100V/10W speakers as an example.
MIC
PC 1
Blu-ray
DVD
Speaker
Speaker
Speaker
Speaker
PC
(100V/10W)
(100V/10W)
(100V/10W)
(100V/10W)
IR Remote
IR Receiver

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Figure 4 Audio Output Connection
Note: Speakers to be connected should be with constant pressure.
3.3.2 Audio Inputs
PA100V Power Amplifier provides with 2 stereo audio inputs, one microphone input and
one digital fiber audio input. The following figure shows the audio input ports.
Figure 5 Audio Input Ports
48V phantom power input
When the switch turns to “48V” (It has a good frequency characteristic, high input
impedance and high sensitivity in this mode), the MIC input will provide a 48V phantom
power. This is usually used for power supply for condenser microphone, Connection is:
“+” connects to positive, “-” connects to negative and “ ” to ground.
Note: In this mode, only condenser microphone can be connected.
MIC input
When the switch turns to “MIC” (It has a low frequency characteristics, and wide
frequency response in this mode), the microphone input is used for connecting with
dynamic microphone. There are two different connections:
a) Unbalanced connection:
“+” and “ ” connect to ground, and “-” connects to signal.
COM 70V 100V
Speaker Speaker Speaker Speaker
(100V/10W)
(100V/10W)
(100V/10W)
(100V/10W)
Dial Switch, to select the MIC input mode,
includes MIC (dynamic microphone), 48V
(condenser microphone) and LINE
(normal audio or wireless microphone).

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“-”and “ ” connect to ground, and “+” connects to signal.
b) Balanced connection: “+” connects to positive, “-” connects to negative and “ ”
connects to ground.
LINE input
When the switch turns to “LINE” (It has a low frequency characteristics, and wide
frequency response in this mode), the microphone input is used for connecting with
normal audio or wireless microphone output. 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
PA100V Power Amplifier has a fiber optical port to connect with digital audio source
device. With the SPF optical fiber, the audio signal can be transmitted faster, more
stable, reliable, and can be transmitted over a long distance without distortion.
Notice: 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 to PA100V Power Amplifier.
3.4 System Applications
PA100V Power Amplifier can be applied in different occasions, such as classroom,
small meeting room, lecture hall, bar and hotel etc.
4. System Operations
4.1 Operations of Front Panel
The buttons provides the control of volume/EQ control and switching. The LED
indicator will show the connecting 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 fiber audio input, switchable through the buttons as below:
Figure 6 Audio Source Selection Button
Audio Source Selection:
1: Dual mono audio
2: Stereo audio
3: Digital fiber audio.

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4.1.2 Volume/EQ controlling
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:
Figure 7 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 “ ”.
4.2 Operations of IR Remote
PA100V Power Amplifier provides with an IR eye, with the IR Receiver and the IR
remote, user can control PA100V Power Amplifier remotely.
Notice: The IR Receiver and the IR remote are all offered for charge.
Figure 8 IR Remote
Audio Mode Switching
Volume Adjustment:
▽: Turn down the volume
△: Turn up the volume
MUTE: Mute the output
Mute Mode:
MIC: Mute the
microphone volume.
LINE: Mute the line
volume.
SPEAKER: Unmute
Use to transmit the
infrared signal send by
the remote controller.
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.
Audio Source Selection:
1:2 RCA dual-mono audio
input
2:1 3.5mm jack
3: 1 Digital fiber audio input