LYINTL DA-2125 User manual

Public Address System
Multi-channel Digital Power Amplifier
DA-2125/DA-225 /DA-25
DA-4 6 /DA-4125/DA-425
User Manual
Thanks for using LYINTL public address system amplifier. For better use the equipment, please read the manual
carefully prior to use.
LY International Electronics. Co., Ltd
Http:// .lyintl.com/

LY International Electronics Co., Ltd.
——V .7
Facture 2 19-7-17
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 ith this mark are the precautions, please al ays use or operate
according to these descriptions.
Please keep the Manual properly for later use.

Matters needing attention
Please read the follo ing 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 po er source by
pulling the plug other than the po er cord. Pulling the
po er cord may result in damages.
• Please keep the po er cord a ay from heat source.
Do not overbend the po er cord or place it any here
it can be stepped on or may cause to trip.
• This is connected to po er source via the plug and
any failure or danger occurs, the user can disconnect
the device from po er source by pulling out the plug
out from the socket, therefore, it is required that the
po er socket should be located some here ith easy
access.
• The device is not completely disconnected from
po er source hen it is s itched "OFF". For sake of
safety, please disconnect the device from the socket if
it is not in user.
Positioning
• Please disconnect the device from po er source
before relocating the device.
• For avoiding deformation of panels and damages to
internal components, please do NOT place the device
here there is heavy dust or violent vibration, or
here it is extremely cold or hot.
• Please keep this device off ater drops or splash or
vase filled ith ater or any other articles of similar
nature.
Connection
• Please disconnect other equipment from
po er source before they are connected to this
product. Please tune volume to its minimum level
before the device is po ered ON or OFF.
• All terminals on the device marked ith are live
and dangerous, and should be connected by trained
personnel.
When abnormal conditions are realized
• Please disconnect the device from po er source
immediately in case the po er cord is orn 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
po er source immediately.
• Please do NOT put the body or any heavy object on
the device and do NOT operate the buttons or
s itches or connections ith excessive force.
Do NOT open
• Please do NOT remove the cover of the equipment,
other ise you may get an electric shock.
• Do NOT attempt to remove any internal component
from the device, or to modify the equipment in
hatever 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 Power Amplifier
- 1 -
I. Product Description
1.1 Features
 Multi-channel: 4-channel or 2-channel;
 5-unit LED for status;
 Advanced active PFC (po er factor correction);
 Efficient s itching po er supply;
 Efficient CLASS D amplifier;
 Support DC 24V po er supply;
 Adjust fan speed ith temperature;
 Equipped ith voltage limit circuit;
 All-protected circuit design;
 Support real-time s itch of 70/100V output;
 Input sensitivity: 775mVRMS;
 Both line input and output interfaces adopt HT-3.81 phoenix;
 100VRMS prior line input;
 Balanced prior line input;
 Balanced line input;
 7.62-4P fence output socket ith cover is adopted for po er output.

Digital Power Amplifier
- 2 -
II. Appearance
2.1 Front Panel
4-Channel series
2-Channel series
1. Indicator
PRO: Signal indicator (signal output); After being po ered on and input ith signal, if the protection
indicator (PRO) and LIM are on first, go out after a fe seconds, and are on again, the output short
circuit fault occurs, and the above phenomena ill repeat if the fault is not removed. No , po er off
immediately, and re-po er 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 hile PRO is off: After the continuous repeated signal makes the output po er reach or
exceed rated po er for 2-4s, the po er limits the start of circuit and halves the rated output po er
automatically. This circuit ill not be started ith audio and music applications under rated po er.
CLP: Clip indicator, please reduce the gain properly to avoid severe clip;
SIG: Input level indicator, for audio output level;
7 V: Gear indicator, if it is al ays on, the current gear is 70V output voltage.
2. Channel volume control knob
Name the volume control knob (CH1) by the number of channels ith an analogy, such as CH1, CH2...
3. Power switch
Po er s itch is provided ith po er indicator, hen placing it in ON position, its internal po er indicator
ill be on.

Digital Power Amplifier
- 3 -
2.2 Rear Panel
4-Channel series
2-Channel series
1. AC po er input ( ith fuse holder)
2. 24V DC po er input (Max. access core is Φ6mm)
3. Air outlet of fan
4. 70V/100V voltage output
5. 70V/100V output s itch
6. Prior 100VRMS single unbalanced line input (2-position3.81 phoenix)
7. Prior balanced line input (3-position 3.81 phoenix, priority signal 6 and 7 are directly mixed. After the
priority signal amplitude exceeds threshold, the balanced line inputs enter the mute status, and the balanced
signal recovers output after it is lo er than threshold for 2-3s)
8. Balanced line input (3-position 3.81 phoenix)
9. Balanced line output (3-position 3.81 phoenix)

Digital Power Amplifier
- 4 -
III. Connection
3.1 Input Connection
All line inputs and outputs should be connected to the 3-position 3.81 phoenix (Fig. 1) or 2-position 3.81
phoenix (Fig. 2) on the machines’ rear panel.
(Fig. 1) 3-position 3.96 Phoenix (Fig. 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 ith ire. COM is common terminal
and OUT is hot terminal.
Note: Never connect two “hot terminals” together.
Note: Connect the other three
groups of po er output in the
same ay, ith COM terminal
and OUT terminal as a group.
Connected to the external
priority audio source
Connected to the external
amplifier equipment
Connected to the external
constant voltage amplifier
Connected to the
external audio source
Connected to DC 24V

Digital Power Amplifier
- 5 -
Packing List of 2-channel Series
No. List Quantity
1 5×19 hole machine fixing scre 4 pcs
2 10A National Standard MP-P po er line 1 pc
3 3.81-2P plug 2 pcs
4 3.81-3P plug 6 pcs
5 User manual 1 copy
6 Plastic asher (Black) 4 pcs
Packing List of 4-channel Series
No. List Quantity
1 5×19 hole machine fixing scre 4 pcs
2 10A National Standard MP-P po er line 1 pc
3 3.81-2P plug 4 pcs
4 3.81-3P plug 12 pcs
5 Certificate / Warranty card 1 copy each
6 User manual 1 copy
7 Plastic asher (Black) 4 pcs

Digital Power Amplifier
- 6 -
Specification
Model number DA-2125 DA-225 DA-25 DA-4 6 DA-4125 DA-425
Number of channels
2
2
2
4
4
4
Rated output po er 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
(balan
ced priority)
100K ohms
(
100V
unbalanced)
Channel separation
>70dB(1KHz)
Frequency response
80Hz
-
15kHz (±3dB
normal operating condi
tions)
THD (total harmonic
distortion)
<0.3 % (1kHz normal operating conditions)
Up speed
>29V/us
Priority thres
hold
>10mVp
(prior balanced line input)
>1000mVp
(
prior
100VRMS
l
ine input
)
Indicators
“
P
rotection
”
,
“
L
imit
”
,
“
V
oltage limit
”
,
“
S
ignal
”
,
“70V
gear
”
Protecti
on
Po er
-
on, high temperature, DC, short circuit
Po er supply
AC
220
V/50Hz DC24V
(rated outp
ut po er
-
3dB)
Overall dimensions (mm)
（L×W×H）552×510×105
Machine dimension (mm)
（L×W×H）483×435×44 (not including machine legs)
Machine le
gs
Four
6.5mm high soft plastic machine legs, can be removed a
s
need
ed
Po er consumption
(
AC220V
)
339W 610W 1270W 347.6W 653W 1240W
Po er consumption
(
DC24V
)
206.4W 350.4W 720W 223.2W 398.4W 708W
Static po er consumption
(
AC220V
)
38W 38W 42W 57.5W 63.5W 57W
Static po er consumption
(
DC24V
)
38.4W 38.4W 43.2W 60W 62.4W 57.6W
Gross eight
(
kg
)
7.4
7.4
7.4
8
8
8
Net eight
(
kg
)
6.4
6.4
6.4
7
7
7
Performance specifications are subject to change ithout notice.
Note:
Maximum hot dissipation = Rated po er consumption － Rated po er output per channel × number of channels
When emitting a voice or playing music, the heat dissipation po er can be calculated at a third of the maximum
heat dissipation.
Rated po er consumption test conditions: AC220V po er supply, input 1KHZ sine ave, output to reach the
rated po er;
DC24V po er supply, input 1KHZ sine ave, output to reach rated po er -3dB.
Rated po er error: ±10%.

Digital Power Amplifier
- 7 -
LY International Electronics Co., Ltd.
Http://www.lyintl.com/
Caution
● When the po er s itch is placed in "OFF" position, the equipment is not completely disconnected ith
net ork source; for safety, please pull out the po er line plug from socket hen it is not used.
● Please keep it a ay from ater, and never put articles like vase filled ith ater on it.
● To avoid electric shock, please don't open the machine's cover plate at ill. It shall be repaired by the
professional ith professional certificate hen necessary.
● The terminals marked ith
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 net ork source through po er line plug, just pull the po er line plug to
disconnect it ith po er net ork in case of its fault or danger, therefore, please put the po er socket in the
place here po er line is easy to plug.