vissonic DPA48 User manual

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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!DPA48 Compact Amplifier V1.0
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User Guide For
DPA48 Compact Amplifier
2x20w 4Ω/8ΩClass D Power Amplifier

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!!!!!!!User Guide for DPA48 compact amplifier!
DPA48 Compact Amplifier! !
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Menu of Contents
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Brief Introduction
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About this manual!.....................................................................................................................!3!
Safety Instructions!.....................................................................................................................!3!
Description!................................................................................................................................!4!
Features!.....................................................................................................................................!4!
Packing details!..........................................................................................................................!5!
Start to Use
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Product View!.............................................................................................................................!6!
Mount & Installation (Quick Start)!...........................................................................................!7!
Connection & Operation
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Connector Cabling!..................................................................................................................!10!
48V Condense Mic!..............................................................................................................!10!
Line input Mic!.....................................................................................................................!11!
Digital Audio Input!.............................................................................................................!11!
Phoenix Line in!...................................................................................................................!11!
Output connection!...............................................................................................................!12!
Control methods!......................................................................................................................!12!
RS-232 connection!..............................................................................................................!12!
Commands for RS232!.........................................................................................................!12!
Specifications!..........................................................................................................................!14!
More Reference
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Trouble Shooting!.....................................................................................................................!16!
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!!!!!!!User Guide for DPA48 compact amplifier!
DPA48 Compact Amplifier! !
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Brief Introduction
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About this manual
This manual introduce about the DPA48 power amplifier, how to use and install it in
the common way and how to control it in commands. We insist you reading the
SAFETY INSTRUCTIONS and QUICK START before using it. In most of our user
manual, we are putting important note, instructions and hints in frames of different color,
please pay attention to those symbols.
Safety Instructions
Avoid plug in power connector with power on, otherwise will lead to electric shock,
or cause damage to the circuit
Installation and wiring must be solid and reliable, otherwise it may result in
malfunction on device.
Make sure the device has been well connected to the ground before using
Do not touch the terminals while power on, or may cause electric shock, malfunctions
Do not disassemble the equipment without permission, to avoid damage to the
internal electrical components and will void the warranty.
NOTE:!Those!information!is!the!supplementary!explanation!to!the!contents,!usage!or!glossary!
CAUTION:!Avoid!improper!operations!to!damage!the!product!or!third!party!devices!connecting!to!it!

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!!!!!!!User Guide for DPA48 compact amplifier!
DPA48 Compact Amplifier! !
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Description
DPA48 is a compact 2x20Watt (Class-D) 4ohms/8ohms amplifier that combines
2xDigital audio, RCA stereo and 1xMic inputs, output is 2x20watts rms at 4 ohms or
2x10W@8 ohms. It also features IR/RS232 control, ID control for looping
connection, screw-connector for DC 24V power supply port.
EQ adjust, balanced Mic mixing audio controllable, makes it ideal for conference
room, class room, addressing hall, bars etc places, by providing the economical,
convenient, low power consumption solution.
Features
40watt output, support 4 ohms/8 ohms loudspeakers—2x20watts rms at 4 ohms or
2x10W@8 ohms
Inputs signal selectable—Choose input signal from digital audio, dual mono by
RCA or 3.5mm stereo audio, balanced Mic etc
Multi-type Mic support—Can connect with 48V phantom power condenser
microphone, dynamic microphone or wireless microphone by switching button
Bass, Treble and volume level adjustment—Corresponding light indicators on
different EQ level control
Mute function—One button to mute the audio out
Two types of digital audio input—Coaxial or fiber optical input. With the S/PDIF,
it can pass the audio signal to further distance without any distortion
Dual mono, stereo mode—Can choose the stereo audio or change to dual-mono
Mic mixing—The audio of mic input can be mixed with line output, user could
adjust the level of mic separately
ID setup for multiple devices control—For specific control when there is more than
one AMP170 connected together, assign different ID for each device.

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!!!!!!!User Guide for DPA48 compact amplifier!
DPA48 Compact Amplifier! !
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IR/RS232 control—with IR receiving cable it can be controlled by IR remote, this is
optional
Screw for power supply—DC24V, secured tight connector.
Convection cooled, fanless Design— Fanless design, makes it quiet, stable, low heat
emission even for 7x24 continuous working.
Antistatic case—Reliable working in complex installing environment
Rack mount or under desk mount- Compact size at 43.6H x 90W x 150D(mm)
Packing details
1x DPA48
1x power adaptor
1x remote controller
1x User manual
Necessary connectors

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!!!!!!!User Guide for DPA48 compact amplifier!
DPA48 Compact Amplifier! !
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Start to Use
There is Quick Start section for you to use basic function of the amplifier without
going through whole manual, learning what the Front Panel/Rear Panel before using
will save you much time.
Product View
Front Panel
1. Select from input signals COAXIAL/OPTICAL/D-MONO/STEREO/PHOENIX
2. Master Volume UP/DOWN
3. Mute the audio output
4. Select from LINE/MIC/BASS/MIDDLE/TREBLE.
NOTE: Pressing MUTE for 3 seconds to restore to default settings, all the EQ will be set to zero.
NOTE: The VOLUME lights lasting for 5 seconds, that means it reaches MAX/MIN volume.
NOTE: The lights for function selection buttons will go off after 3 seconds without any operation

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!!!!!!!User Guide for DPA48 compact amplifier!
DPA48 Compact Amplifier! !
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Rear Panel
5. Power indicator, will turn green connecting with power supply
6. Microphone input and adjust area
7. IR receiving port, by using a receiver to get the IR signal
8. IR loop out port, can pass through the input IR to another device
9. ID for device, please set different one when connecting more than one devices
for PC to control
10. Power connector with screw
11. Signals input area, can connect to different types of audio source including:
coaxial digital, SPDIF, Stereo in RCA, balanced stereo with phoenix, 3.5mm stereo
12. RS232 control port for PC
13. Output to loudspeakers
Mount & Installation (Quick Start)
This part is aiming to help you setup the device in shortest time without using all the
ports and functions, more details please refer to other parts of the manual
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!!!!!!!User Guide for DPA48 compact amplifier!
DPA48 Compact Amplifier! !
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1.!Link high quality cable to connect the loudspeaker with amplifier OUTPUT, we
advise to use 20watts or lower loudspeakers in 4Ω/8Ω
2.!Link the audio source to the LINE INPUTS area of amplifier, put microphone to
the 3-pin MIC connector (set the 48V ACTIVE phantom power if necessary), 3-
pin RS232 CONTROL port to PC, adjust a unique ID to this device.
3.!Connect the power adaptor to amplifier DC 24V in, all the lights in front panel will
be on, after 5 seconds the lights go off, then you can operate on it.
4.!Press INPUT SELECTOR button to choose the corresponding connected audio
input port, then loudspeaker will play the sound
5.!To adjust the EQ, please press FUNC. SELECTOR button to choose, when
corresponding EQ lights on (BASS, MIDDLE, TREBLE), you can press VOL
UP/Down button to increase or reduce the EQ parameter. The function lights
(LINE,MIC,BASS,MIDDLE,TREBLE) will be auto off after 3 seconds if there
is no operation during this time.
6.!Before connecting the Microphone to the device, please make sure the type of your
Mic. You should to press the 48V ACTIVE button down (the green light on), to
connect the Condenser Microphone. Other type of microphone like wireless one,
dynamic microphone, you have to press the 48V ACTIVE button up (the green
light off) then to connect them. Press the FUNC. SELECTOR on front panel, until
the MIC light is on to adjust its volume
7.!Keep pressing the VOL UP/DOWN button, if the lights showing on over 5 seconds
after releasing the button, that means it reaches the MAX/MIN volume
8.!Cascade more than one devices like below diagram

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DPA48 Compact Amplifier! !
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Mounting
The amplifier can be easily mounted in the Rack, by one pair of ears to mount beneath
the table or fixed at any corner with little space occupied.

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!!!!!!!User Guide for DPA48 compact amplifier!
DPA48 Compact Amplifier! !
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Connection & Operation
Have problems with cabling? This part will show the way. Also there is advance part
for engineers who want to remote control it, even control multi-devices at same time
locating in different area.
Connector Cabling
There are 6 inputs for DPA48 audio, user can choose the most convenient way for their
devices to work with it. Please note the 3-pin connection for mics is different according
to the type of mic.
48V Condense Mic***
Comes with 48V phantom power for
condenser microphone with phantom
power supply. This kind of mic is
having high-frequency, high input
impedance and high sensitivity. Press
to choose 48V ON MIC button switch,
to connect condenser microphones
only. Connection: "+" connected to the
positive, "-" to the negative, " " to
ground.
CAUTION: Only use balanced connection with 48V phantom power on.

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DPA48 Compact Amplifier! !
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Line input Mic
Digital Audio Input
It can connect to external devices with SPDIF port, through Optical (Tos-Link) or
coaxial. The advantages fiber transmission is with fast speed, stable and reliable for
digital audio to further distance.
Phoenix Line in
This port can link to audio signal or wireless microphone, it has good wide frequency
response. The cabling is balanced/Unbalanced stereo/mono depends on how you
connect it.
1.!Balanced stereo
Release the 48V button to connect normal dynamic Mic or wireless Mic, you
will see the green light below is off. Can be both balanced or unbalanced
connection
NOTE: Optical input only recognizes / decoding PCM encoded signal, if
using DTS, AC3 disc, DVD player's digital audio, the audio output mode of
those devices must be set to PCM.
CAUTION: DO NOT connect the dynamic microphone with 48V phantom power on!

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2.!Balanced mono
3.!Unbalanced stereo
4.!Unbalanced mono
Output connection
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Control methods
RS-232 connection
Commands for RS232
DPA48 has dual stereo balanced output, the
loudspeaker connecting can be 2x20w@4Ωor
2x10w@8Ω
Use a female 9-pin cable to connect to the
corresponding pins on the DPA48 RS232
connector, then control it by sending RS232
codes from PC.!

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DPA48 Compact Amplifier! !
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Baud Rate：9600bps Data bit:8bits Stop Bit：1 bit Parity: None
Instructions: X is device ID. When points to 0, the device ID is 0, turn it
to A, the device ID change to A.! !
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Audio Switch Command
Command
Feedback
Description
X$0.
COAXIAL INPUT
X$1.
OPTICAL INPUT
X$2.
D-MONO INPUT
X$3.
STEREO INPUT
X$4.
PHOENIX INPUT
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Audio Output Volume Adjust Command
Command
Feedback
Description
X+0;
Line Volume +1dB
X-0;
Line Volume -1dB
X+1;
Mic Volume +1dB
X-1;
Mic Volume -1dB
X+2;
Bass Volume +1dB
X-2;
Bass Volume -1dB
X+3;
Middle Volume +1dB
X-3;
Middle Volume -1dB
X+4;
Treble Volume +1dB
X-4;
Treble Volume -1dB
X+5;
Main Volume +1dB
X-5;
Main Volume -1dB
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Others:
Command!
Feedback!
Description!
X MUTE ON%
>MUTE ON
Audio Output Mute On
X MUTE OFF%
>MUTE OFF
Audio Output Mute Off
X DEFAULT%
>DEFAULT OK
Restore to default after reboot
X EQ%
Restore EQ parameters to default
X 1*
Set the audio ducking time to 0.5s
NOTE: ID “G” is to send codes to all the amplifiers in cascading, so all the
device will response with the same codes.

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(interval time for volume down and up,
below is the same)
X 2*
Set the audio ducking time to 1.0s
X 3*
Set the audio ducking time to 1.5s
X 4*
Set the audio ducking time to 2.0s
X 5*
Set the audio ducking time to 2.5s
X 6*
Set the audio ducking time to 3.0s
X 7*
Set the audio ducking time to 3.5s
X 8*
Set the audio ducking time to 4.0s
X 9*
Set the audio ducking time to 4.5s
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Specifications
Coaxial and Optical digital input
Format: AES3/SPDIF
RCA, 3.5mm and balanced stereo input
Gain: 0dB
Frequency response: 20Hz~20KHz
THD + Noise: 0.05% @ 1 kHz (nominal voltage)
Signal/Noise ratio (S / N) > 80dB
Stereo separation > 80dB @ 1 kHz
CMRR > 75dB @: 20 Hz ~ 20 kHz
Signal type Stereo
Impedance Input:> 10 kΩ(balanced or / unbalanced connection)
Maximum input level + 19.5dBu,
Gain error ± 0.1dB @ 20 Hz ~ 20 kHz
NOTE:
1. Don’t miss the last symbol of each command, like “.” , “*”
2. It has auto memory feature, all the settings will be saved before power loss.
NOTE: Example: The device ID is 1
a：Switch the OPTICAL input to LINE out, send RS232 code: 1$1.
b：Increase volume, send RS232 code：1+0；
c：Set to mute mode, send RS232 code: 1 MUTE OFF%；
d
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Set the audio ducking time to 2 second, send RS232 :1 4*

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DPA48 Compact Amplifier! !
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Mic input signal
Distortion (THD) 0.04% 50Hz ~ 16 kHz
Frequency response 50Hz ~ 16 kHz ± 0.5dB
Input Sensitivity 100mv ~ 500mv
Audio amplifier output signal
Interface 1x Balanced 4-pin phoenix connector
Power 2x20W @ 4Ωor 2x10W @ 8Ω
Control Button on front panel, LED indicators
Serial control interface 3-pin phoenix interface for RS-232
Baud rate and protocol Baud rate: 9600, Data bits: 8, Stop bits: 1, no parity
Serial connection 2 = TX, 3 = RX, 5 = GND
Specification
Power supply DC 24V / 2.5A
Temperature Storage, working temperature: -10 ° ~ + 70 ° C
Humidity Storage, working Humidity: 0 ~ 95%
Weight 1.5kg
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!User Guide for DPA48 compact amplifier!
DPA48 Compact Amplifier! !
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
16
More Reference
Trouble Shooting
Q: No related audio signal output.
A:
!!Check whether there is a corresponding signal inputs. If there is no signal input,
may be the cable is broken or loose joints, replace the connection cable;
!!Check the appropriate output if there is a signal. (Use oscilloscope or multimeter
for testing) if there is no signal output, may be output wiring connector loose or
broken, replace the connection cable;
!!Check the front panel signal input indicator showing which input signal is active;
!!Still can’t solve by above ways, it may in defective situation, please contact your
dealer to deal with.
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Q: Power light is off while connect to power supply, no response on operation.
A: Check the power supply is well connected or not.
Q: Interference in output sound
A: Check the equipment power input is well connected to ground.
Q: When plug in/out audio inputs, there is static electricity feeling on hand.
A: Device power may not properly grounded, please complete it in proper way other
wise it’s easy to damage the device.
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