Beta Three UA2000 User manual

Beta three
RR
User Manual
PROFESSIONAL POWER AMPLIFIER
ED-B3-MA-070410-002
UA2000/UA2002/UA1330/UA1332
UA660/UA662/UA330/UA332/UA880
24 23

series
professional .
Please carefully read and strictly follow the user'smanual when you use UA
amplifier. If you have any question, please contact the local dealer
P1
P1
P2
P10
P10
P12
P12
P13
P13
P14
P16
P16
P17
DEAR CUSTOMERS:
CATALOGUE
1
2
3
4
5
6
7
8
9
10
11
12
13
Attentions
Functions&features
Parameters
Installation
Front panel
Rear panel
Power supply
Input/Output connectors
Function setup and cable connection
Operations
Indicators on front panel
Protection functions
Troubles and troubleshootings

1NOTES
1
2FEATURES
High voltage inside the equipment. Do not open the cover. Ask for the help from the
professionals when need servicing.
Please do not expose the equipment in the rain or moisture.
Keep adequate ventilation, do not block the port.
Be sure the voltage of this equipment complies with the local industrial voltage.
Please put off the power plug if unused for a long time.
Please connect rated load. Never working under the overload for a long time.
The equilateral triangle with lightning bolt warns the user of dangerous voltage levels
localized within the cabinet.
The equilateral triangle with exclamatory mark means the important operation on the
user's manual.
Symbols:
UA series is the amplifier with big power and excellent performance. It can meet
different audio avenues.
1> Big power,dynamic energy;
2> Innovative heat sink structure and high quality heat sink fan assure reliable working for
a long time;
3> "loading impedance temperature-power-running voltage" can be controlled alternately,
Speed of Fan is automatic adjusted by temperature. When load is too low or temperature
is too high, the equipment can adjust the power supply and lower impedance of power,
which improves sound quality and protect the equipment better. The reliability will be
improved remarkably;
4> Low distortion;
5> High slew speed, outstanding sound quality and high transparent;
6> Low noise:S/N>108dB(A Weight);
7> 20Hz~20KHz <+0/-0.25 dB;wide frequency band;
8> Small dimension, 2U rack mounting.
9> UA2002,UA1332,UA662,UA332 are specially designed for low loading imedance,and
can work for a long time under 2 .

3
Stereo mode
Parallel mono mode
Bridged mono mode
<0.05%(10%Rated power
<0.1%(60Hz/7kHz,10%Rated power
Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc
Four fans stepless shifting,
Cooling airflow from front to back
483 452 88mm
30kg
90%
Working temperature: -10 ~40
Storing temperature: -25 ~80
1V
>100V/ s
Unbalanced input 10k ,Balanced input 20k
Three pin XLR/6.35mm
Speakon binding post,NL4 speakon
Parallel/Stereo/Bridge, LF cutting,Grounding,Limit
Yellow-Bridge,Red-Overload,Green-Signal
20Hz~20kHz(+0/-0.25dB)
<15
>800(8 /100Hz)
>75dB
>108dB(A-Weight)
39 0.5dB
<0.25dB
THD
Intermodulation
distortion
Frequency response
Phase difference
Damping factors
Segregation
S/N
Total gain
Input sensitivity
Slew speed
Input impedance
Input connectors
Output connectors
Cooling
Controls on front panel
Controls on rear panel
Indicator on front panel
Amplifier protection
Dimensions
Net weight
Power supply
Environment humidity
Environment
Temperature
Difference of
Channel gain
Switch of AC,Gain controlling knob for channel A and B
8
8
16
1000W
1000W
2000W
1600W
1600W
3200W
4
4
8
Rated Power
2
PARAMETERS-UA2000
AC 220-230V,50Hz/60Hz,1500VA

3
3
PARAMETERS-UA2002
<0.05%(10%Rated power
<0.1%(60Hz/7kHz,10%Rated power
Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc
Four fans stepless shifting,
Cooling airflow from front to back
483 452 88mm
30kg
90%
Working temperature: -10 ~40
Storing temperature: -25 ~80
1V
>70V/ s
Unbalanced input 10k ,Balanced input 20k
Three pin XLR/6.35mm
Speakon binding post,NL4 speakon
Parallel/Stereo/Bridge, LF cutting,Grounding,Limit
Yellow-Bridge,Red-Overload,Green-Signal
20Hz~20kHz(+0/-0.25dB)
<15
>800(8 /100Hz)
>75dB
>108dB(A-Weight)
35.7 0.5dB
<0.25dB
THD
Intermodulation
distortion
Frequency response
Phase difference
Damping factors
Segregation
S/N
Total gain
Input sensitivity
Slew speed
Input impedance
Input connectors
Output connectors
Cooling
Controls on front panel
Controls on rear panel
Indicator on front panel
Amplifier protection
Dimensions
Net weight
Power supply
Environment humidity
Environment
Temperature
Difference of
Channel gain
Switch of AC,Gain controlling knob for channel A and B
AC 220-230V,50Hz/60Hz,1500VA
Stereo mode
Parallel mono mode
Bridged mono mode
4
4
8
950W
950W
1900W
1500W
1500W
3000W
2
2
4
Rated Power

3
4
PARAMETERS-UA1330
<0.05%(10%Rated power
<0.1%(60Hz/7kHz,10%Rated power
Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc
Four fans stepless shifting,
Cooling airflow from front to back
483 375 88mm
18kg
90%
Working temperature: -10 ~40
Storing temperature: -25 ~80
1V
>80V/ s
Unbalanced input 10k ,Balanced input 20k
Three pin XLR/6.35mm
Speakon binding post,NL4 speakon
Parallel/Stereo/Bridge, LF cutting,Grounding,Limit
Yellow-Bridge,Red-Overload,Green-Signal
20Hz~20kHz(+0/-0.25dB)
<15
>800(8 /100Hz)
>75dB
>108dB(A-Weight)
37.3 0.5dB
<0.25dB
THD
Intermodulation
distortion
Frequency response
Phase difference
Damping factors
Segregation
S/N
Total gain
Input sensitivity
Slew speed
Input impedance
Input connectors
Output connectors
Cooling
Controls on front panel
Controls on rear panel
Indicator on front panel
Amplifier protection
Dimensions
Net weight
Power supply
Environment humidity
Environment
Temperature
Difference of
Channel gain
Switch of AC,Gain controlling knob for channel A and B
AC 220-230V,50Hz/60Hz,1000VA
Stereo mode
Parallel mono mode
Bridged mono mode
8
8
16
660W
660W
1330W
1000W
1000W
2000W
4
4
8
Rated Power

3PARAMETERS-UA1332
<0.05%(10%Rated power
<0.1%(60Hz/7kHz,10%Rated power
Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc
Four fans stepless shifting,
Cooling airflow from front to back
483 375 88mm
15kg
90%
Working temperature: -10 ~40
Storing temperature: -25 ~80
1V
>70V/ s
Unbalanced input 10k ,Balanced input 20k
Three pin XLR/6.35mm
Speakon binding post,NL4 speakon
Parallel/Stereo/Bridge, LF cutting,Grounding,Limit
Yellow-Bridge,Red-Overload,Green-Signal
20Hz~20kHz(+0/-0.25dB)
<15
>800(8 /100Hz)
>75dB
>108dB(A-Weight)
34.2 0.5dB
<0.25dB
THD
Intermodulation
distortion
Frequency response
Phase difference
Damping factors
Segregation
S/N
Total gain
Input sensitivity
Slew speed
Input impedance
Input connectors
Output connectors
Cooling
Controls on front panel
Controls on rear panel
Indicator on front panel
Amplifier protection
Dimensions
Net weight
Power supply
Environment humidity
Environment
Temperature
Difference of
Channel gain
Switch of AC,Gain controlling knob for channel A and B
AC 220-230V,50Hz/60Hz,1000VA
Stereo mode
Parallel mono mode
Bridged mono mode
4
4
8
660W
660W
1300W
1000W
1000W
2000W
2
2
4
Rated Power
5

3
6
PARAMETERS-UA660
<0.05%(10%Rated power
<0.1%(60Hz/7kHz,10%Rated power
Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc
Four fans stepless shifting,
Cooling airflow from front to back
483 375 88mm
15kg
90%
Working temperature: -10 ~40
Storing temperature: -25 ~80
1V
>60V/ s
Unbalanced input 10k ,Balanced input 20k
Three pin XLR/6.35mm
Speakon binding post,NL4 speakon
Parallel/Stereo/Bridge, LF cutting,Grounding,Limit
Yellow-Bridge,Red-Overload,Green-Signal
20Hz~20kHz(+0/-0.25dB)
<15
>800(8 /100Hz)
>75dB
>108dB(A-Weight)
34 0.5dB
<0.25dB
THD
Intermodulation
distortion
Frequency response
Phase difference
Damping factors
Segregation
S/N
Total gain
Input sensitivity
Slew speed
Input impedance
Input connectors
Output connectors
Cooling
Controls on front panel
Controls on rear panel
Indicator on front panel
Amplifier protection
Dimensions
Net weight
Power supply
Environment humidity
Environment
Temperature
Difference of
Channel gain
Switch of AC,Gain controlling knob for channel A and B
AC 220-230V,50Hz/60Hz,500VA
Stereo mode
Parallel mono mode
Bridged mono mode
8
8
16
330W
330W
660W
500W
500W
1000W
4
4
8
Rated Power

3
7
PARAMETERS-UA662
<0.05%(10%Rated power
<0.1%(60Hz/7KHz,10%Rated power
Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc
Four fans stepless shifting,
Cooling airflow from front to back
483 375 88mm
12.5kg
90%
Working temperature: -10 ~40
Storing temperature: -25 ~80
1V
>50V/ s
Unbalanced input 10k ,Balanced input 20k
Three pin XLR/6.35mm
Speakon binding post,NL4 speakon
Parallel/Stereo/Bridge, LF cutting,Grounding,Limit
Yellow-Bridge,Red-Overload,Green-Signal
20Hz~20KHz(+0/-0.25dB)
<15
>800(8 /100Hz)
>75dB
>108dB(A-Weight)
31.2 0.5dB
<0.25dB
THD
Intermodulation
distortion
Frequency response
Phase difference
Damping factors
Segregation
S/N
Total gain
Input sensitivity
Slew speed
Input impedance
Input connectors
Output connectors
Cooling
Controls on front panel
Controls on rear panel
Indicator on front panel
Amplifier protection
Dimensions
Net weight
Power supply
Environment humidity
Environment
Temperature
Difference of
Channel gain
Switch of AC,Gain controlling knob for channel A and B
AC 220-230V,50Hz/60Hz,500VA
Stereo mode
Parallel mono mode
Bridged mono mode
4
4
8
330W
330W
660W
500W
500W
1000W
2
2
4
Rated Power

3
8
PARAMETERS-UA330
<0.05%(10%Rated power
<0.1%(60Hz/7kHz,10%Rated power
Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc
Four fans stepless shifting,
Cooling airflow from front to back
483 310 88mm
11kg
90%
Working temperature: -10 ~40
Storing temperature: -25 ~80
1V
>50V/ s
Unbalanced input 10k ,Balanced input 20k
Three pin XLR/6.35mm
Speakon binding post,NL4 speakon
Parallel/Stereo/Bridge, LF cutting,Grounding,Limit
Yellow-Bridge,Red-Overload,Green-Signal
20Hz~20kHz(+0/-0.25dB)
<15
>800(8 /100Hz)
>75dB
>108dB(A-Weight)
32 0.5dB
<0.25dB
THD
Intermodulation
distortion
Frequency response
Phase difference
Damping factors
Segregation
S/N
Total gain
Input sensitivity
Slew speed
Input impedance
Input connectors
Output connectors
Cooling
Controls on front panel
Controls on rear panel
Indicator on front panel
Amplifier protection
Dimensions
Net weight
Power supply
Environment humidity
Environment
Temperature
Difference of
Channel gain
Switch of AC,Gain controlling knob for channel A and B
AC 220-230V,50Hz/60Hz,300VA
Stereo mode
Parallel mono mode
Bridged mono mode
8
8
16
200W
200W
400W
300W
300W
600W
4
4
8
Rated Power

3
9
PARAMETERS-UA332
<0.05%(10%Rated power
<0.1%(60Hz/7kHz,10%Rated power
Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc
Four fans stepless shifting,
Cooling airflow from front to back
483 310 88mm
11kg
90%
Working temperature: -10 ~40
Storing temperature: -25 ~80
1V
>50V/ s
Unbalanced input 10k ,Balanced input 20k
Three pin XLR/6.35mm
Speakon binding post,NL4 speakon
Parallel/Stereo/Bridge, LF cutting,Grounding,Limit
Yellow-Bridge,Red-Overload,Green-Signal
20Hz~20kHz(+0/-0.25dB)
<15
>800(8 /100Hz)
>75dB
>108dB(A-Weight)
29 0.5dB
<0.25dB
THD
Intermodulation
distortion
Frequency response
Phase difference
Damping factors
Segregation
S/N
Total gain
Input sensitivity
Slew speed
Input impedance
Input connectors
Output connectors
Cooling
Controls on front panel
Controls on rear panel
Indicator on front panel
Amplifier protection
Dimensions
Net weight
Power supply
Environment humidity
Environment
Temperature
Difference of
Channel gain
Switch of AC,Gain controlling knob for channel A and B
AC 220-230V,50Hz/60Hz,300VA
Stereo mode
Parallel mono mode
Bridged mono mode
4
4
8
200W
200W
400W
300W
300W
600W
2
2
4
Rated Power

3
10
PARAMETERS-UA880
<0.05%(10%Rated power
<0.1%(60Hz/7kHz,10%Rated power
Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc
Four fans stepless shifting,
Cooling airflow from front to back
483 452 88mm
25kg
90%
Working temperature: -10 ~40
Storing temperature: -25 ~80
1V
>80V/ s
Unbalanced input 10k ,Balanced input 20k
Three pin XLR/6.35mm
Speakon binding post,NL4 speakon
Parallel/Stereo/Bridge, LF cutting,Grounding,Limit
Yellow-Bridge,Red-Overload,Green-Signal
20Hz~20kHz(+0/-0.25dB)
<15
>800(8 /100Hz)
>75dB
>108dB(A-Weight)
38 0.5dB
<0.25dB
THD
Intermodulation
distortion
Frequency response
Phase difference
Damping factors
Segregation
S/N
Total gain
Input sensitivity
Slew speed
Input impedance
Input connectors
Output connectors
Cooling
Controls on front panel
Controls on rear panel
Indicator on front panel
Amplifier protection
Dimensions
Net weight
Power supply
Environment humidity
Environment
Temperature
Difference of
Channel gain
Switch of AC,Gain controlling knob for channel A and B
AC 220-230V,50Hz/60Hz,1200VA
Stereo mode
Parallel mono mode
Bridged mono mode
8
8
16
800W
800W
1600W
1260W
1260W
2560W
4
4
8
Rated Power

4
11
INSTALLATIONS
76.2mm
446mm
441mm
435.7mm
430.5mm
482.4mm
465.0mm
ÆøÁ÷·½ÏòÆøÁ÷·½Ïò
Æø
Á÷
·½ÏòÆø
Á÷
·½Ïò
446mm
425mm
433.0mm
87.9mm
ÆøÁ÷·½ÏòÆøÁ÷·½Ïò
air flow
76.2mm
376mm
371mm
365.7mm
360.5mm
482.4mm
465.0mm
ÆøÁ÷·½
Ïò
ÆøÁ÷·½
Ïò
ÆøÁ÷·½ÏòÆøÁ÷·½Ïò
376mm
355mm
433.0mm
87.9mm
Æø
Á÷
·½ÏòÆø
Á÷
·½Ïò
air flow
UA2000/UA2002/UA880:
UA1330/UA660:

76.2mm
376mm
371mm
365.7mm
360mm
482.4mm
465.0mm
ÆøÁ÷·½ÏòÆøÁ÷·½Ïò
Æø
Á÷
·½ÏòÆø
Á÷
·½Ïò
376mm
355mm
433.0mm
87.9mm
ÆøÁ÷·½ÏòÆøÁ÷·½Ïò
76.2mm
310mm
302.5mm
298mm
292.5mm
UA1332/UA662:
UA332/UA330:
482.4mm
465.0mm
ÆøÁ÷·½ÏòÆøÁ÷·½Ïò
Æø
Á÷
·½ÏòÆø
Á÷
·½Ïò
310mm
289mm
433.0mm
87.9mm
ÆøÁ÷
·½
ÏòÆøÁ÷
·½
Ïò
4INSTALLATIONS
12
air flow
air flow

5FRONT PANEL
UA SERIESUA SERIES
RRPRO DESIGN
BETA THREE UA2000
BRIDGE
PEAK
SIGNAL
00
-2-2
-4-4
-6-6
-8-8
-10-10
-12-12
-14-14
-16-16
-18-18
-20-20
-24-24
00
-2-2
-4-4
-6-6
-8-8
-10-10
-12-12
-14-14
-16-16
-18-18
-20-20
-24-24
CHBCHA
POWER
ON
OUTPUT ASSIGNMENT:
BRIDGE MONO OUTPUT:
CHA :
PIN1+ : SIGNAL
CHA: PIN 1+ :
PIN 1 - :
PIN 2+ :
PIN 2 - :
CHA SIGNAL
CHA GND
CHB SIGNAL
CHB GND
CHB: PIN 1+ :
PIN 1 - :
PIN 2+ :
PIN 2 - :
CHB SIGNAL
CHB GND
GND
PIN2+ :
12
3
4
5
6
789
6REAR PANEL
13
1 air input port
2 signal indicator of channel A
3 overload indicator of channel A
4 bridge indicator of channel
5 overload indicator of channel B
1 signal input of channel A(XLR JACK)
2 signal input of channel A(1/4 mic jack)
3 switch of working modes
4 limiters
5 signal output of channel B(binding post)
6 signal output of channel A(binding post)
7 fuse
6 signal indicator of channel B
7 power switch
8 gain adjustment pots of channel A
9 gain adjustment pots of channel B
8 signal input of channel B(XLR plug)
9 signal input of channel B(1/4 mic jack)
10 filter switch
11 grounding switch
12 signal output of channel A(NL4 JACK)
13 signal output of channel B(NL4 JACK)
14 cable
CHA
BRIDGE IN
CHB
PIN1:
SIGNAL GND
PIN2:
SIGNAL +
PIN3:
SIGNAL -
BRIDGE
PARALLEL
STEREO
MODE LF FILTER GROUND
CLIPLIMITER
ON
OFF
50HZ
25HZ
ON
OFF
CHB OUTPUT
CHA OUTPUT
POWER
CABLE
FUSE
INPUT
-
B
+
-
A
+
-
+
5HZ
BRIDGE
12
345
67
89
10 11
12
13 14
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
!
Special design for big power£¡

7POWER SUPPLY
The XLR jack and 1/4 microphone jack in same channel are paralleled;
Input the signal from either connectors and output the signal for connecting next amplifier;
If the amplifiers connected are too many, the sound quality may be affected;
Please do not input the signal from two connectors in same channel at the same time.
Input connectors
8
14
Please assure the local voltage comply with the voltage indicated on rear panel before
connecting power supply ( );
Please assure the cable and jack of power supply not damaged before connecting power
supply; Put off the plug after power off;
AC 220-230V,50Hz/60Hz
Output connectors
The binding post and NL4 jack in same channel of UA series amplifier are paralleled;
Do not connect loads to the two connectors at the same time;
The red end of binding post is connected with anode of speaker, the black end connected
with cathode of speaker;
Only the load suited with the power and impedance of amplifier can be connected
with the output connectors of amplifier.
INPUT/OUTPUT CONNECTORS

1> :Limiter setup
2> LF cutting setup:
9
LF FILTER
50HZ
25HZ
5HZ
+1
-2
-3
-4
-5
-6
0dB
-1
20 30 40 50
60 80100 200 300 400
500
Hz
15
As the below drawing, when switch is OFF, the limit is off,
thelimit circuit is out of work, if input signal is too strong,
output can cause clip distortion and also raise overload on
loudspeaker
As the below drawing, when the switch is ON, the limit is
on, if the input signal is too strong, the limit circuit can
control the gain and reduce the distortion, also control the
average output power, but it does not affect peak power,
protect the loudspeaker and assure the dynamic of music.
Note: Please set to "ON" position when using.
When LF cutting is at 50Hz,it equals discrete a 50Hz
high pass filter on input, the signal lower than 50Hz will
be accordingly attenuated, then can reduce the
noneffective swing and lower the distortion.
Like the right drawing:
When LF cutting is at 25Hz, it equals discrete a 25Hz
high pass filter on input circuit, it just attenuate the signal
lower than 25Hz.
Like the right drawing:
FUNCTION SETUP AND CABLE CONNECTING
LF FILTER
50HZ
25HZ
5HZ
+1
-2
-3
-4
-5
-6
0dB
-1
20 30 40 50
60 80100 200 300 400
500
Hz
CLIP
LIMITER
OFF
ON
CLIP
LIMITER
OFF
ON

3> Mode option and signal cable connection,
AStereo connecting mode:
BMono paralleled mode:
C Bridged mode:
16
When LF cutting is at 5Hz, the audio signal
can be amplified really.
Like the right drawing:
Like the right drawing:
Connecting direction:
Put the switch of mode at stereo,
like the right picture:
Under the stereo mode, the signal on channel Aand
channel B is independent, the signal to channel Ais
just for channel A, the signal to channel B is only for
Channel B. Like the right drawing:
Put the switch of mode at PARALLEL, like the
below picture:
Under the mono parallel mode, the effect of input
signal from channel A and channel B is same. The
signal on input channel Acan be provided to output A,
also to output B. The signal on input channel B not only
provide to output A, also to output B, But please not
input the signal from channel A and B at the same time.
Note: The mono parallel mode just means the
parallel of input signal. Never parallel the output
terminals, Like the drawing:right
Put the switch of mode at BRIDGE, like the
right picture:
Under the bridged mono, signal just can be input from
channel A, no voice if input from channel B, the anode
of output Ais the anode of bridged output, the anode
of output B is the cathode of bridged output.
like right drawing:
FUNCTION SETUP AND CABLE CONNECTING
MODE
BRIDGE
PARALLEL
STEREO
+1
-2
-3
-4
-5
-6
0dB
-1
20 30 40 50 60 80 100 200 300 400 500 Hz
LF FILTER
50HZ
25HZ
5HZ
XLR unbalanced
XLR asymetrique
unsymetri is che XLR
XLR no balanceado
1
2
3
TRS unbalanced
TRS asymetrique
TRS no balanceado
Unsymetriscbe jStereoklinke
Unbalanced
Asymetrique
Unsymmetrisch
No balanceado non-inverting input +
Ground
12
3
Balanced
Symetrique
Symmetrisch
Balanceado
Ground
inverting input -
non-inverting input +
Under the bridge mode, The output voltage is so high enough to make a
electronic shock. Please power off the unit before operate it under bridge mode.
If need bridge operation under 4 please select UA2002

10
11
12
17
Please follow the steps during using the equipment
1> Start
a Setupthefunction and connection according to the above functionsetupand
connecting;
b Check if the output cable is short circuit and the load is too low;
c Check if the local voltage complies with the user's manual;
d Be sure the switch of power supply at "0" and the volume is the lowest;
e Connect the power supply, turn on the equipment of sound source, pre and effect
equipment and assure these equipments work in order;
f Turn on the switch of power supply(put it at"1"position);
g Adjust the knob of volume clockwise to right position.
2> Off
a Adjust the knob of volume unti-clockwise to the lowest;
b Turn off the switch of power supply on the front panel(put it at "0"position);
c Turn off the pre and effect equipments, sound source equipments;
1>If signal indicator flashes, it means if there is signal output in two channels;
2>If peak indicator flashes, it means that the input voltage is too high. You should turn
down the volume;
3>If the peak indicator always lights,it means faults.The reason is like this: loading is too
low,short on loading,temperature is too high.You should check it after power off. Turn
on again if no abnormity;
4>If bridge indicator lights, it means the amplifier is under the bridged mode.
Perfect protection function can prevent the damage for amplifier andspeaker caused by
short circuit and output DC and overheat.
1>Short circuit protection: when the load at the output end is short circuit, the equipment
can cut off the signal and protect the equipment;
2>Output DC protection: when the equipment has faults and there is DC in output signal,
the equipment can cut off output automatically and avoid damage for speaker caused
by DC;
3>Overheat protection: If the temperature of heat sink is over the allowed temperature,
the sensor will cut off the output, avoid damage caused by high temperature and
protect the amplifier.
OPERATIONS
INDICATORS ON FRONT PANEL
PROTECTION FUNCTION

13
Trouble SN Troublele shootings
Check if the power plug and jack are connected well.
Check if the music signal cable is connected well.
If the power jack corresponds
with .AC 220-230V,50Hz/60Hz
Check if the power of music source is turned on and
the volume is turned on.
Check if the fuse on rear panel is broken.
If the volume pots is turned on.
If the music source output is too big.
If the CLIP LIMITER is at the "ON"position.
Check if there is any short circuit in output
connectons and if the load is correct. The restart.
If the LF FILTER on rear panel is at the LF 50Hz or at
LF 25Hz, setup the switch at appropriate place.
Check if the switch of MODE on rear panel is
at the PARALLEL,please put it at PARALLEL if it not
at the position.
Check the input signal can comply with voltage,
please enhance the input signal if not sufficient.
1
1
2
2
3
3
1
2
3
1
1
1
1
1
Check if input SIGNAL voltage is suited, please
enhance the input SIGNAL if not sufficient.
2
Check the local voltage is same as the voltage of the
equipment.
Check if the setup and connection are accordant with
the user manual.
No voice, Power indicator
lights off
No voice, Power indicator
Lights, Signal indicator
Light off
CLIP indicator last slighting
on, Voice is abnormal
The bass is not sufficient
No voice on one
channel under paralleled
mono mode
Output of bridge is too low
Burning the fuse when start
Others
18
TROUBLES AND TROUBLE SHOOTINGS