Woxcon PA2B User manual

PA2B
Mini Digital Amplifier
All Rights Reserved
Version: PA2B_2018V1.2
User Manual

Mini Digital Amplifier
Preface
Read this user manual carefully before using this product. Pictures shown in this
manual is for reference only, different model and specifications are subject to real
product.
This manual is only for operation instruction only, not for any maintenance usage. Any
changes of functions and parameters since then will be informed separately. Please
refer to the dealers for the latest details.
Trademarks
Product model and its 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 our 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.

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

Mini Digital Amplifier
Table of Contents
Introduction ............................................................................................. 1
1.1. Introduction to Mini Digital Amplifier ............................................... 1
1.2. Features ......................................................................................... 1
1.3. Package List ................................................................................... 1
System Connection Introduction ............................................................. 2
2.1. Audio Output .................................................................................. 2
2.1.1. Default output: 2x20Watt@4Ohm ....................................... 2
2.1.2. Bridge connection: 1x40Watt@8Ohm ................................. 2
2.1.3. Dual-mono Output ............................................................... 3
2.2. Microphone input ............................................................................ 3
2.2.1. 48V phantom power input ................................................... 3
2.2.2. MIC input ............................................................................. 4
2.2.3. LINE input ........................................................................... 4
Operation of the Control Panel and the IR Remote ................................ 4
3.1. Operation of the Control Panel ....................................................... 4
3.1.1. Audio switching ................................................................... 4
3.1.2. Volume/EQ controlling ......................................................... 5
3.2. Usage of the IR Remote ................................................................. 5
System Diagram ..................................................................................... 6
Communication Protocol and Command Codes ..................................... 7
Specification ............................................................................................ 8
Panel Drawing ......................................................................................... 9
Troubleshooting & Maintenance ........................................................... 10
After-sales Service ................................................................................ 11

Mini Digital Amplifier
1
Introduction
1.1. Introduction to Mini Digital Amplifier
The Mini Digital Amplifier 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. Features
l 2x20Watt@4Ohm as the default amplifier output.
l Bridge connection function. User can switch the Mini Digital Amplifier to be
1x40Watt@8Ohm by bridge connection.
l Two stereo audio inputs, switchable by button, IR remote & RS232.
l Volume/Bass/Treble controllable by buttons IR remote & RS232.
l MIC port can support balance/unbalance signal, suppress the external noise
effectively.
l Line audio output at 3.5mm jack, with volume controllable.
l Dual-mono function. User can sum up the stereo audio to two times mono audio.
l MIC mixer function. The microphone will be mixed to the line audio output, and be
controlled separately.
l MIC input supports 48V phantom power, dynamic MIC and wireless MIC.
l Auto noise gate. It keeps detecting the audio and MIC input, will mute the output
when there is no input.
l Ultra low inrush current, no need for power sequencing. This allows multiple Mini
Digital Amplifier to be powered on simultaneously without overloading power
circuits.
l Convection cooler, fan is not needed.
l Antistatic case design: providing good protection for long-term and stable
performance.
1.3. Package List
Ø 1 x Mini Digital Amplifier (The mounting ears and Mini Digital Amplifier are as a
whole.)
Ø 2 x Pluggable Terminal Blocks
Ø 1 x RS232 Cable

Mini Digital Amplifier
2
Ø 1 x Power Adapter
Ø 1 x Power Cord
Ø 4 x Plastic Cushions
Ø 1 x User Manual
Notes
Ø The IR remote and its battery are offered for charge separately.
Ø The IR receiver is also offered for charge.
Ø Please confirm if the product and the accessories are all included, if not, please
contact with the dealers.
System Connection Introduction
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:
2.1.2. Bridge connection: 1x40Watt@8Ohm
The Mini Digital Amplifier 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:
Connecting the four pins, like this

Mini Digital Amplifier
3
2.1.3. Dual-mono Output
The Mini Digital Amplifier 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:
2.2. Microphone input
The microphone input of Mini Digital Amplifier has three modes, and different modes
use different connections, as the picture below:
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.
Connecting the two pins, like this
Connecting the four pins, like this

Mini Digital Amplifier
4
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.
Operation of the Control Panel and the IR Remote
3.1. 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.
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

Mini Digital Amplifier
5
3.1.2. 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 “ ”.
3.2. Usage of the IR Remote
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
1: RCA dual-mono audio
inputs
2: 3.5mm jack
Firstly to
select the
function
from this
menu.
Then to turn
down/up the
level, or
mute the
output.

Mini Digital Amplifier
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Notice: The IR remote, the IR receiver, and the battery of the IR remote are all offered
for charge.
System Diagram
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