PureTools PT-AA-140 User manual

User Manual
PT-AA140
User Manual
Power Amplifier 40W (70V/100V), 3 Line & 1 MIC Inputs
Model PT-AA-140
Designed in Germany
© 2017 PureLink GmbH All rights reserved. VersionV1.0

User Manual
PT-AA140
Preface
Read this user manual carefully before using this product. Pictures shown in this
manual are for reference only. Different model layouts and specifications are subject
to the physical product.
This manual is for operation instructions only, not for any maintenance usage.
In the constant effort to improve our product, we reserve the right to make changes in
functions or parameters without prior notice or obligation.
Trademarks
Product model and logo are trademarks. Any other trademarks mentioned in this
manual are acknowledged as the properties of the trademark owner. No part of this
publication may be copied or reproduced without the prior written consent.
FCC Statement
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. It 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 commercial installation.
Operation of this equipment in a residential area is likely to cause interference, in
which case the user at their own expense will be required to take whatever measures
may be necessary to correct the interference.
Any changes or modifications not expressly approved by the manufacture would void
the user’s authority to operate the equipment.

User Manual
PT-AA140
REACH | 1907/2006/EU
ROHS | 2011/65/EU
PureLink hereby declares that this product PureTools PT-AA140 complies with
Directives 1907/2006/EU und 2011/65/EU.
EMC / LVD (Electro Magnetic Compatibility / Low Voltage Directive)
PureLink GmbH hereby declares that this product PureTools PT-AA140 complies
with Directives 2014/30/EU and 2014/35/EU. The full text of the EU Declaration
of Conformity is available at the following Internet address:
http://www.purelink.de/ce/4251364706640_CE.pdf

User Manual
PT-AA140
SAFETY PRECAUTIONS
To insure the best from the product, please read all instructions carefully before
using the device. Save this manual for further reference.
Unpack the equipment carefully and save the original box and packing
material for possible future shipment
Follow basic safety precautions to reduce the risk of fire, electrical shock and
injury to persons.
Do not dismantle the housing or modify the module. It may result in electrical
shock or burn.
Using supplies or parts not meeting the products’ specifications may cause
damage, deterioration or malfunction.
Refer all servicing to qualified service personnel.
To prevent fire or shock hazard, do not expose the unit to rain, moisture or
install this product near water.
Do not put any heavy items on the extension cable in case of extrusion.
Do not remove the housing of the device as opening or removing housing may
expose you to dangerous voltage or other hazards.
Install the device in a place with fine ventilation to avoid damage caused by
overheat.
Keep the module away from liquids.
Spillage into the housing may result in fire, electrical shock, or equipment
damage. If an object or liquid falls or spills on to the housing, unplug the
module immediately.
Do not twist or pull by force ends of the optical cable. It can cause
malfunction.
Do not use liquid or aerosol cleaners to clean this unit. Always unplug the
power to the device before cleaning.
Unplug the power cord when left unused for a long period of time.
Information on disposal for scrapped devices: do not burn or mix with general
household waste, please treat them as normal electrical wastes.

User Manual
PT-AA140
Contents
1. Introduction..................................................................................................................................1
1.1 Introduction to PT-AA140...............................................................................................1
1.2 Feature ................................................................................................................................1
1.3 Package Content...............................................................................................................2
2. Panel Description........................................................................................................................3
2.1 Front Panel.........................................................................................................................3
2.2 Rear Panel...........................................................................................................................4
3. System Connection.....................................................................................................................6
3.1 Usage Precaution..............................................................................................................6
3.2 System Diagram................................................................................................................6
3.3 Audio Signal Connection ................................................................................................7
3.3.1 Audio Output .........................................................................................................7
3.3.2 Audio Input.............................................................................................................8
3.4 System Applications ........................................................................................................9
4. System Operation..................................................................................................................... 10
4.1 Button Control................................................................................................................ 10
4.1.1 Audio switching.................................................................................................. 10
4.1.2 Volume/EQ controlling..................................................................................... 11
4.2 IR Remote Control ......................................................................................................... 12
4.3 RS232 Control ................................................................................................................ 13
4.3.1 Connection with Computer............................................................................. 13
4.3.2 RS232 Control Software .................................................................................. 13
4.3.3 Running Environment....................................................................................... 14
4.3.4 Function Setting................................................................................................. 14
4.3.5 RS232 Command ............................................................................................... 15
5. Specification.............................................................................................................................. 18
6. Panel Drawing........................................................................................................................... 19
7. Troubleshooting and Maintenance...................................................................................... 21
8. After-Sales Service................................................................................................................... 22

User Manual
PT-AA140
1
1. Introduction
1.1 Introduction to PT-AA140
The PT-AA140 is a 40 Watt 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 PT-AA140 is designed to integrate with both voltages to meet different
requirements.
1.2 Feature
Mono audio output at 40Watt.
Switchable between 70V and 100V.
Ducking function.
16 ID codes for controlling between different PT-AA140 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.

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1.3 Package Content
1 x PT-AA140
2 x Mounting Ears with 4 Screws
4 x Plastic Cushions
2 x Pluggable Terminal Blocks
1 x Power Adapter (DC 24V 2.71A)
1 x User Manual
Note: Confirm if the product and the accessories are all included, if not, please contact
with your dealers.

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2. Panel Description
2.1 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 RCA connectors 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
123

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2.2 Rear Panel
No.
Name
Function
①
Power
Indicator
Turns red when power on.
②
Microphone
Input
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
with 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.
678910
12345

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No.
Name
Function
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 PT-AA140.
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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PT-AA140
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3. System Connection
3.1 Usage Precaution
No working with empty load is allowed.
Speakers must be connected before power on.
3.2 System Diagram
MIC
Audio Player
DVD
Laptop
IR
Receiver
RemoteControl Panel Speaker
Audio:
IR:
RS232:

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PT-AA140
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3.3 Audio Signal Connection
3.3.1 Audio Output
The PT-AA140 supports mono audio output, and the output voltage is 70V or
alterative 100V. With its dual-purpose design, it can be applied in different areas. The
end COM is for grounding. The amplifier to be connected is mono audio output with a
rated power at 40Watt, so PT-AA140 can be connected with several speakers in
parallel connection way (Total power mustn’t be more than 40Watt).
The following figure shows us how to connect with the speakers. Here we take the
100V/10W speakers for each as example.
Note: Speakers to be connected should be with constant pressure.
COM 70V 100V
Speaker Speaker Speaker Speaker
(100V/10W)
(100V/10W)
(100V/10W)
(100V/10W)

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3.3.2 Audio Input
The PT-AA140 provides with 2 stereo audio inputs, one microphone input and one
digital fiber audio input. The following figure shows the 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 with.
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.
“-”and “ ” connect to ground, and “+” connects to signal.
b) Balanced connection: “+” connects to positive, “-” connects to negative and “ ”
connects to ground.
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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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
The PT-AA140 provides with 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
connect to PT-AA140.
3.4 System Application
The PT-AA140 can be applied in different occasions, such as classroom, small meeting
room, lecture hall, bar and hotel etc.

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PT-AA140
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4. System Operation
4.1 Button Control
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:
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:
For example, to turn up the line volume, you should select the “LINE” first, and then
press the button “ ”.
Audio Mode Switching
Volume Adjustment:
▽: Turn down the volume
△: Turn up the volume
MUTE: Mute the output

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4.2 IR Remote Control
The PT-AA140 provides with an IR eye, with the IR Receiver and the IR remote, user
can control PT-AA140 remotely.
Notice: The IR Receiver and the IR remote are all offered for charge.
IR Remote
IR Receiver
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
IR receiver, works together
with the IR remote. Please
point the IR remote at the IR
receiver when use, to avoid
getting out of control as
there is no signal detected.
3.5mm jack
Insert it into the
specialized
PT-AA140 socket
(3.5mm), to
connect the IR
receiver with
PT-AA140.

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4.3 RS232 Control
4.3.1 Connection with Computer
When the amplifier connects to the COM1 or COM2 of the computer with control
software, users can control it by that computer.
To control the amplifier, users should use a 3-pole male captive screw to 9-pin HD
female connector and use the public COM software.
4.3.2 RS232 Control Software
Installation
Connect the input source devices and the output device according to the system
diagram.
Copy the RS232 control software to one computer, and then connect the RS232
port of this computer and PT-AA140.
Double-click the EXE program to execute the software.
Here we take the software CommWatch.exe as example. The icon is showed as below:
Uninstallation Delete all the control software files in corresponding file path.
PC

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4.3.3 Running Environment
While the control software is installed, we can activate the software through the
RS232 port and set the parameters, to make it able to send RS232 commands to
control 4PT-AA140.
4.3.4 Function Setting
With the control software, we can easily switch the input channel, mute the output,
check the working status, and adjust the volume etc. Please refer the details in RS232
Communication Commands.
The interface of the control software is showed as below:
Parameter Configuration area
Monitoring area, indicates if
the command sent works.
Command Sending area

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4.3.5 RS232 Command
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
3A0.
Enable noise gate.
Gate On
4A0.
Disable noise gate.
Gate Off
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