Public Address System
Multi-channel Digital Amplifier
DA2125
DA2250
DA2500
DA4060
DA4125
DA4250
PRO
LIM
CLP
SIG
70V
0
1
2
3
4
5
6
7
8
9
10
CH1
Digital Power Ampllfier DA4XXX
ON
OFF
POWER
PRO
LIM
CLP
SIG
70V
0
1
2
3
4
5
6
7
8
9
10
CH2
PRO
LIM
CLP
SIG
70V
0
1
2
3
4
5
6
7
8
9
10
CH3
PRO
LIM
CLP
SIG
70V
0
1
2
3
4
5
6
7
8
9
10
CH4
User's Manual
Welcome to use DSPPA public address system, please read the User's Manual carefully first for better use.
G u a n g z h o u D S P P A A u d i o Co. , Ltd.
http：//www.DSPPA.com
About the Manual
The Manual will be available since the date when the development of multi-channel digital
amplifier is completed. The Manual describes the features, precautions, system connections,
operating instructions, and other contents of the multi-channel digital amplifier, please read it
carefully before using, and operate as instructed by it.
All the descriptions marked with this mark are the precautions, please always use or operate
according to these descriptions.
Please keep the Manual properly for later use.
DAxxxx——V0.1
Facture 2016-01-28
Matters needing attention
Please read the following before operating the product.
Warning
The following basic requirements must be strictly observed, to avoid potential personal injury and
equipment or property damages to you or any person nearby. The basic requirements include without
limitation to the following:
Power source/power cable
• Please disconnect the device from power source by
pulling the plug other than the power cord. Pulling the
power cord may result in damages.
• Please keep the power cord away from heat source.
Do not overbend the power cord or place it anywhere
it can be stepped on or may cause to trip.
• This is connected to power source via the plug and
any failure or danger occurs, the user can disconnect
the device from power source by pulling out the plug
out from the socket, therefore, it is required that the
power socket should be located somewhere with easy
access.
• The device is not completely disconnected from
power source when it is switched "OFF". For sake of
safety, please disconnect the device from the socket if
it is not in user.
Positioning
• Please disconnect the device from power source
before relocating the device.
• For avoiding deformation of panels and damages to
internal components, please do NOT place the device
where there is heavy dust or violent vibration, or
where it is extremely cold or hot.
• Please keep this device off water drops or splash or
vase filled with water or any other articles of similar
nature.
Connection
• Please disconnect other equipment from
power source before they are connected to this
product. Please tune volume to its minimum level
before the device is powered ON or OFF.
• All terminals on the device marked with are live
and dangerous, and should be connected by trained
personnel.
When abnormal conditions are realized
• Please disconnect the device from power source
immediately in case the power cord is worn or
damaged or if the sound is suddenly cut off or any
abnormal odor or smoke comes out from the device,
and then have the device inspected and repaired by
professional personnel.
Precautions in Operation
• Please do NOT insert any finger into any gap or
opening of the device.
• Please prevent foreign objects (paper, plastics or
metal etc.) from being inserted or falling into any gap
or opening of the device. In such case, please cut off
power source immediately.
• Please do NOT put the body or any heavy object on
the device and do NOT operate the buttons or
switches or connections with excessive force.
Do NOT open
• Please do NOT remove the cover of the equipment,
otherwise you may get an electric shock.
• Do NOT attempt to remove any internal component
from the device, or to modify the equipment in
whatever manner. In case of any abnormal condition,
please stop using the device immediately and have it
inspected and repaired by professional personnel.
Other Precautions
• Our company shall not be responsible for data loss
or damages due to improper use of unauthorized
modification to the device.
• The images and screen display in this Manual are
only for description and may be different from
screen images in actual operation. The screen
display depends on the product.
Digital Amplifier
- 1 -
I. PRODUCT
1.1 FEATURES
Multiple channels: 4-channel or 2-channel;
5-unit LED lamp for status display;
Advanced active PFC (power factor
correction);
Efficient switching power supply;
Efficient CLASS D amplifier;
Support DC 24V power supply;
Adjust fan speed with temperature;
Equipped with voltage limit circuit;
All-protected circuit design;
Support real-time switch of 70/100V output;
Input sensitivity: 775mVRMS;
Both line input and output interfaces adopt
HT-3.96 phoenix;
100VRMS prior line input;
Balanced prior line input;
Balanced line input;
HB-9500 7.62 fence output socket with cover is
adopted for power output.
Digital Amplifier
- 2 -
II. APPEARANCE
2.1 Front panel
4-channel series
PRO
LIM
CLP
SIG
70V
0
1
2
3
4
5
6
7
8
9
10
CH1
Digital Power Ampllfier DA4XXX
ON
OFF
POWER
PRO
LIM
CLP
SIG
70V
0
1
2
3
4
5
6
7
8
9
10
CH2
PRO
LIM
CLP
SIG
70V
0
1
2
3
4
5
6
7
8
9
10
CH3
PRO
LIM
CLP
SIG
70V
0
1
2
3
4
5
6
7
8
9
10
CH4
1 2 3
2-channel series
PRO
LIM
CLP
SIG
70V
0
1
2
3
4
5
6
7
8
9
10
CH1
0
1
2
3
4
5
6
7
8
9
10
CH2
PRO
LIM
CLP
SIG
70V
Digital Power Ampllfier DA2XXX
ON
OFF
POWER
1 2 3
1. Indicator
PRO: After being powered on and input with signal, if the protection indicator (PRO) and LIM
are on first, go out after a few seconds, and are on again, the output short circuit fault
occurs, and the above phenomena will repeat if the fault is not removed. Now, power off
immediately, and re-power on after troubleshooting.
LIM: Limit indicator;
A. Both LIM and PRO are on: Amplifier is in short circuit or over-current protection.
B. LIM is on while PRO goes out: After the continuous repeated signal makes the output
power reach or exceed rated power for 2-4s, the power limits the start of circuit and halves
the rated output power automatically. This circuit will not be started with audio and music
applications under rated power.
CLP: Clip indicator, please reduce the gain properly to avoid severe clip;
SIG: Signal indicator (signal output);
70V: Gear indicator, if it is on, the current gear is 70V output voltage.
2. Channel volume control knob
Name the volume control knob (CH1) by the number of channels with an analogy, such as CH1,
CH2;
3. Power switch
Power switch is provided with power indicator, when placing it in ON position, its internal
power indicator will be on.
Digital Amplifier
- 3 -
2.2 REAR PANEL
4-channel series
AC180-250V/50Hz DC24V INPUT
+
CH4
P G N
CH3 CH2 CH1
P G N
P G N
P G N
P G N
100V GND
P G N
100V GND
P G N
100V GND
P G N
100V GND
CH4
P G N
CH3
CH2 CH1
P G N
P G N P G N
1 2 3 4
100V
70V
COM OUT
1
3
2
4
COM OUT
RISK OF ELECTRIC SHOCK
DO NOT OPEN
Nur Sicherung 250V
Use Only With A 250V Fuse
Employer Unlquement Avec
Fusible De 250V
1 2 3 4
ON
1 2
7
9
5
86
3
4
2-channel series
CH2 CH1
P G N P G N
CH2 CH1
P G N P G N
CH2 CH1
P G N P G N
CH2 CH1
100V
70V
COM OUT COM OUT
100V GND 100V GND
CH2 CH1
CH2 CH1
AC180-250V/50Hz DC24V INPUT
+
Nur Sicherung 250V
Use Only With A 250V Fuse
Employer Unlquement Avec
Fusible De 250V
1
4
6
7
2
9
5
3
8
1 2
ON
1. 220V AC power input (with fuse holder)
2. 24V DC power input (max. access core is Φ6mm)
3. Air outlet of fan
4. 70V/100V voltage output
5. 70V/100V output switch
6. Prior 100VRMS single unbalanced line input (2-position 3.96 phoenix)
7. Prior balanced line input (3-position 3.96 phoenix, priority signal 6 and 7 are directly mixed.
After the priority signal amplitude exceeds threshold, the balanced line inputs to enter the
mute status, and the balanced signal recovers output after it is lower than threshold for 2-3s)
8. Balanced line input (3-position 3.96 phoenix)
9. Balanced line output (3-position 3.96 phoenix)
Digital Amplifier
- 4 -
III. CONNECTION
AC180-250V/50Hz DC24V INPUT
+
CH4
P G N
CH3
CH2 CH1
P G N
P G N
P G N
P G N
100V GND
P G N
100V GND
P G N
100V GND
P G N
100V GND
CH4
P G N
CH3
CH2 CH1
P G N
P G N P G N
1 2 3 4
100V
70V
COM OUT
1
3
2
4
COM OUT
RISK OF ELECTRIC SHOCK
DO NOT OPEN
Nur Sicherung 250V
Use Only With A 250V Fuse
Employer Unlquement Avec
Fusible De 250V
1 2 3 4
ON
3.1 Input connection
All line inputs and outputs should be connected to the 3-position 3.96 phoenix (Figure 1) or
2-position 3.96phoenix (Figure 2) on the machine's rear panel.
(Figure 1) 3-position 3.96 Phoenix (Figure 2) 2-position 3.96 Phoenix
P— — Signal (+)
G— —Ground
N— — Signal (-)
100V— — 100V output terminal (hot terminal) of external constant voltage amplifier .
GND— — Output ground (cold terminal) .
3.2 Output connection
Output terminal locates on the rear panel and can be directly connected with wire. COM is
common terminal and OUT is hot terminal.
Note: Never connect two "hot terminals" ever.
Connect the external
amplifier equipment
Connect DC 24V
Connect the external
priority audio source
Connect the external
audio source
Connect the external constant
voltage amplifier
Note: Connect the other three
groups of power output in the
same way, with COM terminal
and OUT terminal as a group.
Digital Amplifier
- 5 -
Packing list of 2-channel series
No.
List
Qty.
1
5×19 machine set screw
4 pcs
2
10A National Standard MP-P power line
1 pc
3
HT-3.96-2P plug
3 pcs
4
HT-3.96-3P plug
7 pcs
5
User's Manual
1 pc
Packing list of 4-channel series
No.
List
Qty.
1
5×19 machine set screw
4 pcs
2
10A National Standard MP-P power line
1 pc
3
HT-3.96-2P plug
5 pcs
4
HT-3.96-3P plug
13 pcs
5
Certificate of Conformity/Warranty Card
1 pc for each
6
User's Manual
1 pc
Digital Amplifier
- 6 -
Performance specification
SPECIFICATION
DA2125
DA2250
DA2500
DA4060
DA4125
DA4250
Number of channels
22244
4
Rated output power of each
channel
120W
250W
500W
60W
120W
250W
Input sensitivity
775mVRMS (0dBV/all balanced input) 100VRMS (100V unbalanced input)
SNR (signal-to-noise ratio)
>80dB (100VRMS output)
Input impedance
60K ohms (balanced) 20K ohms (balanced priority) 100K ohms (100V unbalanced)
Channel separation
>70dB(1KHz)
Frequency response
80Hz-15kHz (±3dB normal operating conditions)
THD (total harmonic
distortion)
< 0.3 % (1kHz normal operating conditions)
Up speed
>29V/us
Priority threshold
>10mVp (prior balanced line input)>1000mVp (prior 100VRMS line input)
Indicators
"Protection", "Limit", "Voltage Limit", "Signal", and "70V gear"
Protection
Power-on, high temperature, DC, short circuit
Power supply
AC180-260V/50-60Hz DC24V (rated output power-3dB)
Overall dimensions (mm)
（L×W×H）552×510×105
Machine dimension (mm)
（L×W×H）483×435×44 (not including machine legs)
Machine legs
Four 6.5mm high soft plastic machine legs, can be removed as needed
Power consumption
300W
600W
1200W
300W
600W
1200W
Gross weight（kg）
8
8.2
8.6
8.799.3
Net weight （kg）
6.7
6.9
7.3
7.4
7.7
8
Performance specifications are subject to change without notice.
Digital Amplifier
- 7 -
Guangzhou DSPPA Audio Co., Ltd.
Precautions
● When the power switch is placed in "OFF" position, the equipment is not completely disconnected with
network source; for safety, please pull out the power line plug from socket when it is not used.
● Please keep it away from water, and never put articles like vase filled with water on it.
● To avoid electric shock, please don't open the machine's cover plate at will. It shall be repaired by the
professional with professional certificate when necessary.
● The terminals marked with on the equipment mean that they are dangerous and electrified, and they should
be connected by the trained personnel.
● Since the equipment is connected to network source through power line plug, just pull the power line plug to
disconnect it with power network in case of its fault or danger, therefore, please put the power socket in the
place where power line is easy to plug.
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