Be sure to read the instructions in this section carefully before use.
Make sure to observe the instructions in this manual as the conventions of safety symbols and messages
regarded as very important precautions are included.
We also recommend you keep this instruction manual handy for future reference.
Safety Symbol and Message Conventions
Safety symbols and messages described below are used in this manual to prevent bodily injury and property
damage which could result from mishandling. Before operating your product, read this manual first and
understand the safety symbols and messages so you are thoroughly aware of the potential safety
Indicates a potentially hazardous situation which, if mishandled, could
result in death or serious personal injury.
Indicates a potentially hazardous situation which, if mishandled, could
result in moderate or minor personal injury, and/or property damage.
When Installing the Unit
Do not expose the unit to rain or an environment
where it may be splashed by water or other liquids,
as doing so may result in fire or electric shock.
Use the unit only with the voltage specified on the
unit. Using a voltage higher than that which is
specified may result in fire or electric shock.
Do not cut, kink, otherwise damage nor modify the
power supply cord. In addition, avoid using the
power cord in close proximity to heaters, and never
place heavy objects -- including the unit itself -- on
the power cord, as doing so may result in fire or
electric shock.
Be sure to replace the unit's terminal cover after
connection completion. Because high voltage is
applied to the speaker terminals, never touch these
terminals to avoid electric shock.
Be sure to ground to the safety ground (earth)
terminal to avoid electric shock. Never ground to a
gas pipe as a catastrophic disaster may result.
When the Unit is in Use
Should the following irregularity be found during
use, immediately switch off the power, disconnect
the power supply plug from the AC outlet and
contact your nearest dealer. Make no further
attempt to operate the unit in this condition as this
may cause fire or electric shock.
If you detect smoke or a strange smell coming
from the unit.
If water or any metallic object gets into the unit
If the unit falls, or the unit case breaks
If the power supply cord is damaged (exposure of
the core, disconnection, etc.)
If it is malfunctioning (no tone sounds.)
To prevent a fire or electric shock, never open nor
remove the unit case as there are high voltage
components inside the unit. Refer all servicing to
your nearest dealer.
Do not place cups, bowls, or other containers of
liquid or metallic objects on top of the unit. If they
accidentally spill into the unit, this may cause a fire
or electric shock.
Avoid installing or mounting the unit in unstable
locations, such as on a rickety table or a slanted
surface. Doing so may result in the unit falling
down, causing personal injury and/or property
damage.
Do not insert nor drop metallic objects or
flammable materials in the ventilation slots of the
unit's cover, as this may result in fire or electric
shock.
3
Page 4
ATTENTION2.
When Installing the Unit
Never plug in nor remove the power supply plug
with wet hands, as doing so may cause electric
shock.
When unplugging the power supply cord, be sure
to grasp the power supply plug; never pull on the
cord itself. Operating the unit with a damaged
power supply cord may cause a fire or electric
shock.
When moving the unit, be sure to remove its power
supply cord from the wall outlet. Moving the unit
with the power cord connected to the outlet may
cause damage to the power cord, resulting in fire or
electric shock. When removing the power cord, be
sure to hold its plug to pull.
Do not block the ventilation slots in the unit's cover.
Doing so may cause heat to build up inside the unit
and result in fire.
Avoid installing the unit in humid or dusty locations,
in locations exposed to the direct sunlight, near the
heaters, or in locations generating sooty smoke or
steam as doing otherwise may result in fire or
electric shock.
When the Unit is in Use
Do not place heavy objects on the unit as this may
cause it to fall or break which may result in
personal injury and/or property damage. In
addition, the object itself may fall off and cause
injury and/or damage.
Make sure that the volume control is set to
minimum position before power is switched on.
Loud noise produced at high volume when power is
switched on can impair hearing.
Do not operate the unit for an extended period of
time with the sound distorting. This is an indication
of a malfunction, which in turn can cause heat to
generate and result in a fire.
Contact your dealer as to the cleaning. If dust is
allowed to accumulate in the unit over a long
period of time, a fire or damage to the unit may
result.
If dust accumulates on the power supply plug or in
the wall AC outlet, a fire may result. Clean it
periodically. In addition, insert the plug in the wall
outlet securely.
Switch off the power, and unplug the power supply
plug from the AC outlet for safety purposes when
cleaning or leaving the unit unused for 10 days or
more. Doing otherwise may cause a fire or electric
shock.
An all-pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated in
the electrical installation of the building.
4
Page 5
3. GENERAL DESCRIPTION
This series two-channel pre-amplifier with the latest styles to meet the needs of small and medium
sized public address system.Two-channel pre-amplifier has 2 inputs at the same time,cac enhance the
audio signal simutenously . Two-channel audio pre-amplifier is the connector of all audiou sources
(including common sources such as CD drive, modem, sound recording deck , MP3 players , special
audio alarm and a variety of microphones ) and the power amplifier devices.The volume of each input
source can be adjusted independently,with priority ranking function,which can require the input source
to prioritize. Two-channel pre-amplifier has sound quality control functions,such as through its ring
tone control circuit or other control circuit, to regulate and control the frequency characteristics of
signals,to play modified and beautifythe sound, and meet the requirementsof the listener's preferences.
4. FEATURES
Standard chassis design, 1U aluminium alloy; light equipment, simple operation, artistic and
practical
Each input independent volume and treble /bass volume adjustment
MIC 1-2 balanced microphone inputs with +48 phantom power switch and gain adjustment
With alarm generator, to provide for the paging tone
LINE 1-4 line input with gain adjustment
REC has a left and right channel audio input and balance left and right channels output control
MIC 1 ~ MIC 2 input priority to other
5
Page 6
5. NOMENCLATURE AND FUNCTIONS
5.1 FRONT PANEL
MIC 1
LEVEL TREBLE BASS
2
1
3
MIC 2
LEVEL TREBLE BASS
5
4
SOURCE
6
7
1. MIC1 Volume Control
2. MIC1 treble adjustment
The treble response, clockwise rotation,
MIC1 increase treble output , whereas
reduced.
3. MIC1 bass tone adjustment
LEVEL
MUSIC
TREBLE BASS
9810
RIGHT
MASTER
LEFT
121114
OUTPUT LEVEL
-13
13
0 -3 -8
+3
POWER
PROJECT
MIX241
15 16
6. MIC2 bass adjustment
7. Line channels selector
8. Line volume control
9. Line treble control
10. Line bass control
11. Left and Right volume control
Adjust the bass response , clockwise
rotation, MIC1 increase treble output,
whereas reduced.
4. MIC2 Volume Control
5. MIC2 treble adjustment
12. Left channel control
13. Left channel level indicator
14. Right channel level indicator
15. Power Switch
16. Power LED (Blue)
6
Page 7
NOMENCLATURE AND FUNCTIONS
5.2 REAR PANEL
2625
OUTP UTS
RI GHT
USE ONLY WITHA 250W FUSE
17
VOLTAGE SELECTOR
LE FT
1 2
3
0.775V/6000.775V/600
18
RIGHT
REC
LEFT
125mV-1.2V
10k
19
17. ~ 230V 50Hz power input
18. Left and right channel line outputs
(XLR)
19. Left and right channel audio input
(REC)
20. Line input (LINE1 ~ LINE4)
21. Alarm signal input circuit
MIC1 PRIORITY
LINE 2
LINE 4
LINE 3
GAINGAIN
125mV-1.2V
125mV-1.2V
10k
10k
LINE 1
GAIN
20
GAIN
125mV-1.2V
10k
ALARM
21
1
MIC2 PRIORITY
2
3
MIC2 +48V PHANTOM
4
MIC1 +48V PHANTOM
234
1
1 2 3 4
ON
4mV-45mV/6004mV-45mV/600
22
INPUTS
MIC 1MIC 2
MIC
LINE
12
GAIN
3
23
3
12
24
MIC
2
1
3
LINE
GAIN
22. MIC (1 ~ 2) +48 V phantom power dial
the code Switch and priority function
control
23. MIC (1 ~ 2) phantom microphone input
24. MIC (1 ~ 2) GAIN gain adjustment
25. MIC (1-2) output switch
26. LINE (1 ~ 4) GAIN gain adjustment
7
Page 8
Power LED
+3
0 -3 -8
POWER
ON
OFF
INPUTS
MIC1MIC2
21
3
OUTPUTS
REC
LINE2
LINE1
GAIN
LINE4
LINE3
GAINGAIN
ALARM
RIGHT
LEFT
GAIN
USE ONLY WITHA 250W FUSE
1234
ON
12
3123
VOLTAGE SELECTOR
MIC
LINE
GAIN
MIC
LINE
GAIN
12
3
RIGHT
MIC1PRIORITY
MIC2PRIORITY
MIC2+48VPHANTOM
1
2
3
4
MIC1+48VPHANTOM
1
234
LEFT
0.775V/6000.775V/600
4mV-45mV/6004mV-45mV/600
125mV-1.2V10k
125mV-1.2V10k
125mV-1.2V10k
125mV-1.2V10k
6.1
Power switch
6.2
6.OPERATION ILLUSTRATION
15
MIC 1
LEVEL TREBLE BASS
MIC 2
LEVEL TREBLE BASS
SOURCE
MUSIC
RIGHT
MASTER
LEVEL
TREBLE BASS
LEFT
-13
OUTPUT LEVEL
POWER
0 -3 -8
+3
Figure 6.1/6.2
When the power switch to "ON" , power light becomes blue.
When the power switch to "OFF" , power light extinguish.
Note:
In order to work properly, equipment must be confirmed in a normal power state. If the machinefails,
please contact the vendor.
6.3 Power Input
17
INPUT S
MIC1 PRIORITY
USE ONLY WITHA 250W FUSE
VOLTAGE SELECTOR
OUTPUTS
RIG HT
LEF T
1 2
3
0.775V/6000.775V/600
REC
LINE 4
LEFT
RIGHT
125mV-1.2V
10k
LINE 2
LINE 3
GAIN
GAINGAIN
125mV-1.2V
125mV-1.2V
10k
10k
1
LINE 1
MIC2 PRIORITY
2
3
MIC2 +48V PHANTOM
4
MIC1 +48V PHANTOM
GAIN
ALARM
1234
1 2 3 4
ON
125mV-1.2V
10k
MIC
LINE
12
GAIN
3
4mV-45mV/6004mV-45mV/600
M IC 1MIC 2
MIC
2
1
3
LINE
12
GAIN
3
Figure 6.3
Power is to provide energy to equipment, must be safe use of power supply, don't use it, please pull power
Note:
When used it, must use the security power input within the stipulated scope, avoid causingaccidents.
8
Page 9
6.OPERATION ILLUSTRATION
INPUTS
MIC1MIC2
21
3
OUTPUTS
REC
LINE2
LINE1
GAIN
LINE4
LINE3
GAINGAIN
ALARM
RIGHT
LEFT
GAIN
1234ON
12
3
12
3
MIC
LINE
GAIN
MIC
LINE
GAIN
1 2
3
RIGHT
MIC1PRIORITY
MIC2PRIORITY
MIC2+48VPHANTOM
1
2
3
4
MIC1+48VPHANTOM
1
234
LEFT
0.775V/6000.775V/600
4mV-45mV/6004mV-45mV/600
125mV-1.2V10k
125mV-1.2V10k
125mV-1.2V10k
125mV-1.2V10k
INPUTS
MIC1MIC2
21
3
OUTPUTS
REC
LINE2
LINE1
GAIN
LINE 4
LINE3
GAINGAIN
ALARM
RIGHT
LEFT
GAIN
1234ON
12
3
12
3
MIC
LINE
GAIN
MIC
LINE
GAIN
1 2
3
MIC1PRIORITY
MIC2PRIORITY
MIC2+48VPHANTOM
1
2
3
4
MIC1+48VPHANTOM
1
234
LEFT
4mV-45mV/6004mV-45mV/600
125mV-1.2V10k
125mV-1.2V10k
125mV-1.2V
10k
125mV-1.2V10k
Left and Right channel line output jack about (XLR)
6.4
18
INPUTS
MIC1 PRIORITY
OUTPUTS
RIG HT
LEF T
REC
LINE 4
125mV-1.2V
10k
180 3-pole XLR
LINE 3
GAIN
GAINGAIN
125mV-1.2V
125mV-1.2V
10k
10k
1.Ground pin
12
2.The hot end of the foot signal (positive)
3
3.The cold end of the foot signal (negative)
VOLTAGE SELECTOR
USE ONLY WITHA 250W FUSE
350-WATT AMPLIFIER
ON
OFF
OL
CLIP
POWER
PROT
SIGNAL
VOLUME
5
4 6
3
7
2
8
1
9
0
10
1 2
3
0.775V/6000.775V/600
LEFT
RIGHT
1
LINE 2
LINE 1
MIC2 PRIORITY
2
3
MIC2 +48V PHANTOM
4
MIC1 +48V PHANTOM
GAIN
ALARM
1234
1 2 3 4
ON
125mV-1.2V
10k
MIC
LINE
12
GAIN
3
4mV-45mV/6004mV-45mV/600
MIC 1MIC 2
MIC
2
1
3
LINE
12
GAIN
3
Figure 6.4
L/R OUTPUT
L / R OUTPUT line out, two channel selectable. All output should be connected to the Karon
jack on the rear panel of the machine.Volume control is done by the left and right volume knobs and each
with a row of signal lights, can understand the level of the signal outputs. This feature allows pure power
amp to work as pre-amplifier with the extensions amplifier feature.
Note:
L / R OUTPUT line out, you must first volume to mid-range position, to avoid the sound exposur
REC audio input interface
6.5
19
USE ONLY WITHA 250W FUSE
VOLTAGE SELECTOR
OUTPUTS
RIG HT
LEF T
1 2
3
0.775V/6000.775V/600
REC
LINE 4
LEFT
RIGHT
125mV-1.2V
10k
LINE 2
LINE 3
GAIN
GAINGAIN
125mV-1.2V
125mV-1.2V
10k
10k
1
LINE 1
MIC2 PRIORITY
2
3
MIC2 +48V PHANTOM
4
MIC1 +48V PHANTOM
GAIN
ALARM
1234
1 2 3 4
ON
125mV-1.2V
10k
MIC
LINE
12
GAIN
3
4mV-45mV/6004mV-45mV/600
MIC 1MIC 2
MIC
2
1
3
LINE
12
GAIN
3
INPUTS
MIC1 PRIORITY
CARD HOLDER
Figure 6.5
REC recording deck input interface, Left and right channel selectable. REC audio input interfaces to deck machine
Note:
When REC inputs, you must first volume to mid-range position, to avoid the sound exposure
1.
9
Page 10
6.OPERATION ILLUSTRATION
INPUTS
MIC1MIC 2
21
3
LINE 2
LINE 1
ALARM
GAIN
1 2 3 4
ON
12
3
12
3
MIC
LINE
GAIN
MIC
LINE
GAIN
MIC1 PRIORITY
MIC2 PRIORITY
MIC2 +48V PHANTOM
1
2
3
4
MIC1 +48V PHANTOM
1
234
4mV-45mV/6004mV-45mV/600
125mV-1.2V
10k
6.6
LINE(1~4) Line Inputs
20
USE ONLY WITHA 250W FUSE
VOLTAGE SELECTOR
OUTPUTS
RIG HT
LEF T
1 2
3
0.775V/6000.775V/600
INPUTS
MIC1 PRIORITY
REC
LINE 4
LEFT
RIGHT
125mV-1.2V
10k
LINE 2
LINE 3
GAIN
GAINGAIN
125mV-1.2V
125mV-1.2V
10k
10k
1
LINE 1
MIC2 PRIORITY
2
3
MIC2 +48V PHANTOM
4
MIC1 +48V PHANTOM
GAIN
ALARM
1234
1 2 3 4
ON
125mV-1.2V
10k
MIC
LINE
12
GAIN
3123
4mV-45mV/6004mV-45mV/600
MIC 1MIC 2
MIC
2
1
3
LINE
GAIN
CD
POWER
ON
OFF
CD PLAYER
OPEN
CLOSE
PLAY STOP NEXTPREVIOUS
TUNER
AM/FM TUNER
POWER
ON
OFF
BAND AUTO TUNING
Figure 6.6
LINE (1 ~ 4) line input , adjustable L (1 ~ 4) switches, and control the LINE (1 ~ 4) line inputs. Line input signal
can be adjusted by the volume knobs and the BASS/TREBLE control. At the same time, LINE (1 ~ 4) line input,
you can adjust the GAIN volume. By adjusting the GAIN size, You can control the input gain between 20 ~ 0dB.
LIN (1 ~ 4) line in the formula audio line input for connecting CD/MP3/TUNER equipment running
Note:
When using the line input, you must first volume to mid-range position, to avoid the sound exposure
1.
Please avoid multiple audio input at the same time, or it will cause noise
2.
Alarm signal input circuit
6.7
21
USE ONLY WITHA 250W FUSE
VOLTAGE SELECTOR
OUTPUTS
RIG HT
LEF T
1 2
3
0.775V/6000.775V/600
INPUTS
MIC1 PRIORITY
REC
LINE 4
LEFT
RIGHT
125mV-1.2V
10k
LINE 2
LINE 3
GAIN
GAINGAIN
125mV-1.2V
125mV-1.2V
10k
10k
1
LINE 1
MIC2 PRIORITY
2
3
MIC2 +48V PHANTOM
4
MIC1 +48V PHANTOM
GAIN
ALARM
1234
1 2 3 4
ON
125mV-1.2V
10k
MIC
LINE
12
GAIN
3
4mV-45mV/6004mV-45mV/600
MIC 1MIC 2
MIC
2
1
3
LINE
12
GAIN
3
ALARMING SIGNAL GENERATOR
ALARMING SIGNAL GENERATOR
POWER
STANDBY
ON
OFF
REC
PLAY
MIC
MSG
PLAY
PLAY
ALARM MODE
RECORD
LINE
SIREN
VOL
START STOP
Figure 6.7
Alarm signal input circuit, when the circuit is disconnected and closed signal, alarm will be triggered.The
volume of the alarm depends on the input level.
Note:
Please turn the volume to mid-range position, to avoid the sound exposure
1.
10
Page 11
6.OPERATION ILLUSTRATION
INPUTS
MIC 1MIC 2
2 1
3
ALARM
GAIN
1 2 3 4
ON
12
3
12
3
MIC
LINE
GAIN
MIC
LINE
GAIN
MIC1 PRIORITY
MIC2 PRIORITY
MIC2 +48V PHANTOM
1
2
3
4
MIC1 +48V PHANTOM
1
234
4mV-45mV/6004mV-45mV/600
125mV-1.2V
10k
MIC 1/MIC 2 balanced microphone input and Stubbs address code switch
6.8
MIC 1
Figure 6.8
MIC 1/MIC 2 balanced microphone input, volume size is determined by the panel MIC 1/MIC 2 knob control,
combined with BASS / TREBLE adjust the volume knob to achieve the desired acoustic effect.MIC 1/MIC 2
Use a balanced microphone input, adjustable phantom address priorities and can be manually controlled.
When the address code (1,2) switch, open the"1" address code, means the MIC 1 has priority over MIC2 and
LINE inputs 1-4 input. Open the "2" address code, means MIC 2 has priority over MIC1. When the +48 phan
-tom power address code (3,4) switch, open the "3" address code, said the MIC 2 balanced microphone with
power supply to the dynamic microphones;; when the +48 phantom switch, open the "4" address code, MIC 2
balanced microphone without power supply to the dynamic microphones.Besides, MIC (1 ~ 2) the hasthe gain
control. GAIN contol is between 20 ~ 60dB.
Note:
When using the microphone input, you must first volume to mid-range position, to avoid sending the
1.
sound exposure.
Microphone input priority must first adjust address code. Otherwise, the priority can not be controlled
2.
Must ensure that the microphone is fully inserted, otherwise the call function can not be achieved
3.
MIC 2
22 23
USE ONLY WITHA 250W FUSE
VOLTAGE SELECTOR
OUTPUTS
RIG HT
1 2
3
0.775V/6000.775V/600
LEF T
REC
LINE 4
LEFT
RIGHT
125mV-1.2V
10k
LINE 2
LINE 3
GAIN
GAINGAIN
125mV-1.2V
125mV-1.2V
10k
10k
1
LINE 1
MIC2 PRIORITY
2
3
MIC2 +48V PHANTOM
4
MIC1 +48V PHANTOM
GAIN
ALARM
1234
1 2 3 4
ON
125mV-1.2V
10k
MIC
LINE
12
GAIN
3123
4mV-45mV/6004mV-45mV/600
MIC 1MIC 2
MIC
2
1
3
LINE
GAIN
INPUTS
MIC1 PRIORITY
11
Page 12
7.EQUIPMENT INNER DRAWING
Power Input
Transforma
Audio PCB Board
Power switch
audo PCB board
8. INSTALLATION STEPS
Panels
4
INPUTS
MIC1 PRIORITY
1
OUTPUTS
RIGHT
LEFT
1 2
3
0.775V/600 0.775V/600
REC
LEFT
RIGHT
125mV-1.2V
10k
VOLTAGE SELECTOR
USE ONLY WITHA 250W FUSE
LINE 2
LINE 1
LINE 4
LINE 3
GAIN
GAINGAIN
GAIN
125mV-1.2V
125mV-1.2V
125mV-1.2V
10k
10k
10k
1
MIC2 PRIORITY
2
3
MIC2 +48V PHANTOM
4
MIC1 +48V PHANTOM
ALARM
1234
12 34
ON
4mV-45mV/600 4mV-45mV/600
MIC
LINE
12312
MIC 1MIC 2
MIC
2
1
3
LINE
GAIN
GAIN
3
2
MIC 1
LEVEL TREBLE BASS
MIC 2
LEVEL TREBLE BASS
MUSIC
SOURCE
LEVEL
TREBLE BASS
RIGHT
MASTER
LEFT
POWER
OUTPUT LEVEL
0 -3 -8
-13
+3
3
1. Firstly, install board inside the machine with wiring.
2. After install the back panel and floor with screws.