PTN PA2B Manuale utente
Mini Digital Amplifier
PTN Electronics Limited www.PTN-electronics.com
PA2B
PTN Mini Digital Amplifier
USER MANUAL
Version: PA2B2013V1.2
Mini Digital Amplifier
PTN Electronics Limited www.PTN-electronics.com
NOTICE: Please read this user manual carefully before using this product.
Update History
Version
Date
Update Content
1.0
2012.12.25
First version.
1.1
2012.12.28
Update the pictures related to the IR remote.
1.2
2013.01.07
Modified some operation commands.
This manual is for operation instruction only, not for any maintenance usage. The
functions described in this version are updated till January 2013. Any changes of
functions and parameters since then will be informed separately. Please refer to
the dealers for the latest details.
This manual is copyright PTN Electronics Limited. All rights reserved. No part of
this publication may be copied or reproduced without the prior written consent of
PTN Electronics Limited.
All product function is valid till 2013-01-07.
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PTN Electronics Limited www.PTN-electronics.com
Table of Contents
1. Introduction .............................................................................................................. 1
1.1. Introduction to PA2B........................................................................................1
1.2. Package Contents ...........................................................................................1
2. Features...................................................................................................................1
3. Specification.............................................................................................................2
4. System Connection Introduction ..............................................................................2
4.1. Audio Output....................................................................................................2
4.1.1. Default output: 2x20Watt@4Ohm.........................................................2
4.1.2. Bridge connection: 1x40Watt@8Ohm ..................................................3
4.1.3. Dual-mono Output................................................................................ 3
4.2. Microphone input.............................................................................................4
4.2.1. 48V phantom power input.....................................................................4
4.2.2. MIC input..............................................................................................4
4.2.3. LINE input.............................................................................................4
5. Operation of the Control Panel and the IR Remote.................................................. 5
5.1. Operation of the Control Panel ........................................................................5
5.1.1. Audio switching ....................................................................................5
5.1.2. Volume/EQ controlling..........................................................................5
5.2. Usage of the IR Remote..................................................................................6
6. System Diagram.......................................................................................................7
7. Communication Protocol and Command Codes ......................................................7
8. Panel Drawing.......................................................................................................... 9
9. Troubleshooting & Maintenance............................................................................. 10
10.Safety Operation Guide...........................................................................................11
11. After-sales Service................................................................................................. 12
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1. Introduction
1.1.Introduction to PA2B
PA2B 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.Package Contents
1 x PA2B (The mounting ears and PA2B are as a whole.)
1 x Power Cord
1 x User Manual
1 x Warranty Card
Notes：
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.
2. Features
2x20Watt@4Ohm as the default amplifier output.
Bridge connection function. User can switch the PA2B 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 PA2B
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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3. Specification
Audio Input
Audio Output
Input
2 stereo audio,
1 MIC
Output
1 amplifier,
1 stereo audio
Input
Connector
2 RCA
1 3.5mm jack
1 captive screw
connector
(3P,3.81mm),
Output
Connector
1 3.5mm jack
1 captive screw
connector (4P,
5.08mm)
Input
Impedance
>10KΩ
Output
Impedance
50Ω/stereo,
4~8Ω/Amplifier
Audio General
Frequency
Response
20Hz ~ 20KHz
CMRR
>70dB@20Hz~20KH
z
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
TCP/IP
Control
TCP/IP controlled by PTNET(PTN's programmable interface)
4. System Connection Introduction
4.1.Audio Output
4.1.1. 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:
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4.1.2. Bridge connection: 1x40Watt@8Ohm
The PA2B 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:
4.1.3. Dual-mono Output
The PA2B 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:
Connecting the two pins, like this
Connecting the four pins, like this
Connecting the four pins, like this
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4.2.Microphone input
The microphone input of PA2B has three modes, and different modes use different
connections, as the picture below:
4.2.1. 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.
4.2.2. 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.
4.2.3. 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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5. Operation of the Control Panel and the IR Remote
5.1.Operation of the Control Panel
The buttons provides the control of volume/EQ control and switching. The following
content introduces audio switching and EQ control in detail.
5.1.1. Audio switching
There are two switchable stereo audio inputs, one 2xRCA input, and one 3.5mm jack
input, switchable through the buttons as below:
5.1.2. 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:
Firstly to
select the
function
from this
menu.
Then to turn
down/up the
level, or
mute the
output.
Source
Selection
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For example, to turn up the line volume, you should select the “LINE” first, and then
press the button “ ”.
5.2.Usage of the IR Remote
Notice: 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 PA3
socket (3.5mm), to
connect the IR
receiver with PA3.
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
2RCA dual-mono audio inputs
13.5mm jack
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6. System Diagram
7. Communication Protocol and Command Codes
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 Audio
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: 30
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