Manual
PS Series Amplifier
PS-5000 PS-4000 PS-3000
Professional Amplifiers
for Live Sound
w w w . u n i k a . c o m . t w
UNiKA
Manual
PS Series Amplifier
PS-5000 PS-4000 PS-3000
Professional Amplifiers
for Live Sound
w w w . u n i k a . c o m . t w
UNiKA
12
NOTE
：
When the clip LEDs light, there is distortion present in the amplifier's output section.
if a clip LED remains on or flashes repeatedly, reduce the signal level by lowering the
input level control for channel 1 or reduce the level at the source. During Mono
Bridge operation, the channel 2 level is inactive, however, both channels LEDs
will flash simultaneously and show output conditions.
USING THE SIGNAL GROUND LIFT SWITCH
Depending on you system configuration, sometimes applying the ground will create
a quieter signal path. Sometimes lifting the ground can eliminate ground loops and
hum to create a quiter signal path.
1. With the power amp on, listen to the system in idle mode (no signal present) with
the ground applied
（
the SIGNAL GROUND LIFT SWITCH
（
5
）
in the left positi-
on
）
.
2. Then turn the power off before moving the SIGNAL GROUND LIFT SWITCH
（
5
）
. Lift the ground by moving the SIGNAL GROUND LIFT SWITCH to the right, turn
the power back on and listen to determine which position will provide a signal
devoid of background noise and hum. Keep the SIGNAL GROUND LIFT SWITCH
in the ground position if the noise level remains the same in either position.
CAUTION
：
Do not terminate the ac ground on the power amplifier in any way. Termination of the
ac ground can be hazardous.