PureTools PT-AA220 User manual

User Manual
PT-AA220
User Manual
Audio Amplifier 2x20W Output, 4Ω, 2 Line & 1 MIC Inputs
Model PT-AA220
Designed in Germany
© 2017 PureLink GmbH All rights reserved. VersionV1.0

User Manual
PT-AA220
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-AA220
REACH | 1907/2006/EU
ROHS | 2011/65/EU
PureLink hereby declares that this product PureTools PT-AA220 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-AA220 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/4251364706633_CE.pdf

User Manual
PT-AA220
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-AA220
Contents
1. Introduction..................................................................................................................................1
1.1. Introduction to PT-AA220..............................................................................................1
1.2. Feature ...............................................................................................................................1
1.3. Package List ......................................................................................................................2
2. System Connection.....................................................................................................................3
2.1. Audio Output ....................................................................................................................3
2.1.1. Default Output: 2x20Watt@4Ohm.................................................................3
2.1.2. Bridge Connection: 1x40Watt@8Ohm ..........................................................3
2.1.3. Dual-Mono Output...............................................................................................4
2.2. Microphone Input............................................................................................................4
2.2.1. 48V Phantom Power Input ................................................................................4
2.2.2. MIC Input................................................................................................................5
2.2.3. LINE Input ..............................................................................................................5
2.3. System Diagram...............................................................................................................6
3. System Operation........................................................................................................................7
3.1. Panel Control....................................................................................................................7
3.1.1. Audio Switching ...................................................................................................7
3.1.2. Volume/EQ Control .............................................................................................8
3.2. IR Remote Control ...........................................................................................................9
3.3. RS232 Command .......................................................................................................... 10
4. Specification.............................................................................................................................. 12
5. Panel Drawing........................................................................................................................... 13
6. Troubleshooting & Maintenance.......................................................................................... 14
7. After-Sales Service................................................................................................................... 15

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PT-AA220
1
1. Introduction
1.1. Introduction to PT-AA220
The PT-AA220 is a compact-size digital amplifier (Class-D) with 3 inputs (2 line in and
1 balanced MIC). It is integrated with powerful functions, including bridge connection,
dual-mono, EQ control, microphone mixer etc.
It has a good application in different places, including classroom, small meeting room,
lecture hall, bar, pub etc.
1.2. Feature
2x20Watt@4Ohm as the default amplifier output.
Bridge connection function. User can switch the PT-AA220 to be
1x40Watt@8Ohm by bridge connection.
Two stereo audio inputs, switchable by button, IR remote & RS232.
Volume/Bass/Treble controllable by buttons IR remote & RS232.
MIC port can support balance/unbalance signal, suppress the external noise
effectively.
Line audio output at 3.5mm jack, with volume controllable.
Dual-mono function. User can sum up the stereo audio to two times mono audio.
MIC mixer function. The microphone will be mixed to the line audio output, and be
controlled separately.
MIC input supports 48V phantom power, dynamic MIC and wireless MIC.
Auto noise gate. It keeps detecting the audio and MIC input, will mute the output
when there is no input.
Ultra low inrush current, no need for power sequencing. This allows multiple
PT-AA220 to be powered on simultaneously without overloading power circuits.
Convection cooler, fan is not needed.
Antistatic case design: providing good protection for long-term and stable
performance.

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PT-AA220
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1.3. Package List
1 x PT-AA220 (The mounting ears and PT-AA220 are as a whole.)
2 x Pluggable Terminal Blocks
1 x Power Adapter
1 x Power Cord
4 x Plastic Cushions
1 x User Manual
Note:
The IR remote and its battery are offered for charge separately.
The IR receiver is also offered for charge.
Please confirm if the product and the accessories are all included, if not, please
contact with the dealers.

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PT-AA220
3
2. System Connection
2.1. Audio Output
2.1.1. Default Output: 2x20Watt@4Ohm
The default output of amplifier is 2x20Watt@4Ohm, so user can connect the
amplifier output in the regular way. As the picture below:
Speaker
OUTPUTS
LOOP
1x40Watt 8@ Ω
2x20Watt 4@ Ω
RS232
Tx Rx
IR
STEREO BRIDGE
MONO
LR
MIC
LINE
48V
MIC 1 2
INPUTS
STEREO BRIDGE
MONO
Speaker
2.1.2. Bridge Connection: 1x40Watt@8Ohm
The PT-AA220 has the bridge connection, to double the output power at
1x40Watt@8Ohm. It will sum up the input left channel and input right channel to be
mono output, and the power is up to 40Watt.
The bridge connection is:
OUTPUTS
LOOP
1x40Watt 8@ Ω
2x20Watt 4@ Ω
RS232
Tx Rx
IR
STEREO BRIDGE
MONO
LR
MIC
LINE
48V
MIC 1 2
INPUTS
Speaker
STEREO BRIDGE
MONO

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PT-AA220
4
2.1.3. Dual-Mono Output
The PT-AA220 also has the function of double-mono output. It can sum up the left
and right channel, to be the mono audio output. In this way, the both of the outputs
are showing the same mono audio.
The connection is:
Speaker
OUTPUTS
LOOP
1x40Watt 8@ Ω
2x20Watt 4@ Ω
RS232
Tx Rx
IR
STEREO BRIDGE
MONO
LR
MIC
LINE
48V
MIC 1 2
INPUTS
Speaker
STEREO BRIDGE
MONO
2.2. Microphone Input
The microphone input of PT-AA220 has three modes, and different modes use
different connections, as the picture below:
RS232
Tx Rx
IR
STEREO BRIDGE
MONO
LR
MIC
LINE
48V
MIC 1 2
INPUTS MIC
MIC
LINE
48V
Mode Switch
2.2.1. 48V Phantom Power Input
When the switch turns to “48V”, 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.

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PT-AA220
5
2.2.2. MIC Input
When the switch turns to “MIC”, the microphone input is used for connecting with
dynamic microphone. There are two different connections:
1) Unbalanced connection:
“╧” connects to ground, and “-” connects to signal.
“╧” connects to ground, and “+” connects to signal.
2) Balanced connection: “+” connects to positive, “-” connects to negative and “╧”
connects to ground.
2.2.3. LINE Input
When the switch turns to “LINE”, the microphone input is used for connecting with
normal audio or wireless microphone output. There are two different connections:
1) Unbalanced connection:
“╧” connects to ground, and “-” connects to signal.
“╧” connects to ground, and “+” connects to signal.
2) Balanced connection: “+” connects to positive, “-” connects to negative and “╧”
connects to ground.

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PT-AA220
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2.3. System Diagram
RS232
Tx Rx
IR
STEREO BRIDGE
MONO
LR
MIC
LINE
48V
MIC 1 2
INPUTS
OUTPUTS
LOOP
1x40Watt 8@ Ω
2x20Watt 4@ Ω
MIC IR Receiver
Remote
Control
Panel Audio Player Speaker
Speaker
MIC IR Receiver
Remote
Control
Panel Audio Player
Front Panel Rear Panel
Audio:
IR:
RS232:

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PT-AA220
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3. System Operation
3.1. Panel Control
The buttons provides the control of volume/EQ control and switching. The following
content introduces audio switching and EQ control in detail.
3.1.1. Audio Switching
There are two switchable stereo audio inputs, one 2xRCA input, and one 3.5mm jack
input, switchable through the buttons as below:
Source
Selection

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PT-AA220
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3.1.2. 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:
For example, to turn up the line volume, you should select the “LINE” first, and then
press the button “ ”.
Firstly to
select the
function
from this
menu.
Then to turn
down/up
the level, or
mute the
output.

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PT-AA220
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3.2. IR Remote Control
Note: The IR remote, the IR receiver, and the battery of the IR remote are all offered for
charge.
IR receiver head, works in
conjunction 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 socket
(3.5mm) to
connect the IR
receiver with the
amplifier
Mute Mode:
MIC: Mute the
microphone
volume.
LINE: Mute the line
volume.
SPEAKER: Unmute
Use to transmit the
infrared signal send
by the IR remote.
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 Inputs
RCA dual-mono audio
inputs
3.5mm jack

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PT-AA220
10
3.3. 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
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
3A0.
Switch on Noise Gate
Gate On
4A0.
Switch off Noise Gate
Gate Off
600%
Checking the working status
A: 1 -> 1
Volume: 30
Bass: 00
Treble: 00
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: 04
606%
Bass level down
Bass of LINE: 04
607%
Treble level up
Treble of LINE: 04
608%
Treble level down
Treble of LINE: 04
609%
Initialization, back to the default
setting
Init OK
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

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PT-AA220
11
Command
Function Description
Feedback Code
8[x][x]%
Preset the bass level, [xx] arranges
from [00] to [08].
9 degrees in total.
Bass of LINE: 04
9[x][x]%
Preset the treble level, [xx]
arranges from [00] to [08].
9 degrees in total.
Treble of LINE: 04
Notice:
The letter inside bracket [ ] is the variable code, which is changeable.
The bracket [ ] is not included to the RS232 commands.
Any dot “.” after the letters is part of the commands.
Example 1:
Switching the input 2 to the line out, RS232 command is: [2A1.]
Example 2:
Turning up the volume of line audio, RS232 command is: [603%]
Example 3:
Preset the MIC volume to “21” degree, RS232 command is: [521%]
Example 4:
Checking the working status of PT-AA220, RS232 command is: [600%]

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PT-AA220
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4. Specification
Audio Input
Input
(2) stereo audio; (1) MIC
Input Connector
(2) RCA; (1) 3.5mm jack;
(1) pluggable terminal block (3P,3.81mm),
Input Impedance
>10KΩ
Audio Output
Output
(1) amplifier; (1) stereo audio
Output Connector
(1) 3.5mm jack; (1) pluggable terminal block (4P, 5.08mm)
Output Impedance
50Ω/stereo, 4~8Ω/Amplifier
Audio General
Frequency
Response
20Hz ~ 20KHz
CMRR
>70dB@20Hz~20KHz
SNR
80dB at maximum output
Bandwidth
20Hz ~ 25KHz
Stereo Channel
Separation
>75dB@20Hz to 20KHz
THD + Noise
1%@1KHz, 0.3%@20KHz at nominal level
Voltage Gain
32dB
Power Output
2x20 Watts (4 Ohms)
Control Function
RS232 Control
3-hole phoenix connector
Panel Control
Optional button control
IR Remote
Optional IR remote

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PT-AA220
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5. Panel Drawing
87 mm 57 mm
12 mm 123 mm
99 mm
39.5 mm

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PT-AA220
14
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
input/output, maybe the input/output cables broken or the connectors loosen,
please change for another cable.
Check if the output port number is the same with the controlled one.
If not the problem mentioned above, probably there is something broken inside
the unit, please send it to the dealer for repairing.
2) If the POWER indicator doesn’t work or no respond to any operation, please make
sure the power cord connection is good.
3) If the output sound is interfered, 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 would damage the converter.
5) If the PT-AA220 amplifier cannot be controlled by the keys on the front panel,
RS232 port or IR remote, the unit may has already been broken. Please send it
to the dealer for repairing.

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PT-AA220
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7. After-Sales Service
If there appear some problems when running the product, please check and deal with
the problems referring to this user manual. Any transport costs are borne by the users
during the warranty.
1) Product Limited Warranty: This product will be free from defects in materials and
workmanship for two years (The purchase invoice shall prevail).
Proof of purchase in the form of a bill of sale or receipted invoice which is
evidence that the unit is within the Warranty period must be presented to obtain
warranty service.
2) What the warranty does not cover (servicing available for a fee):
Warranty expiration.
Factory applied serial number has been altered or removed from the product.
Damage, deterioration or malfunction caused by:
Normal wear and tear.
Use of supplies or parts not meeting our specifications.
No certificate or invoice as the proof of warranty.
The product model showed on the warranty card does not match with the
model of the product for repairing or had been altered.
Damage caused by force majeure.
Servicing not authorized by distributor.
Any other causes which does not relate to a product defect.
Delivery, installation or labor charges for installation or setup of the product.
3) Technical Support: For any questions or problems, contact your distributor or
reseller and tell them the respective product name and version, the detailed
failure situation as well as the formation of the cases.