W W W . P S S O . D E
31
Adjusting the Level
1
First, set the volume controls of the preamplifiers to zero and turn both level controls of the amplifier to
mid-position. There should be no loud humming. Should humming persist, check the connection cables
between the preamplifier and the amplifier (switch off components before).
2
Adjust the level controls to the desired volume value. If the signal LED lights, the sensitivity at the
outputs is approx. 0.35 V. The LEDs
“-10 dB
” and
“-5 dB
” show the adjusted input level. In case of
overload, the red
CLIP
indicator lights up. In this case, reduce the volume correspondingly.
3
In bridge mode the level control for channel 2 is disabled. Volume adjustment is made with the level
control for channel 1.
Additional information on the operation
When operating the amplifying system, please make sure that the loudspeakers always sound well. When
distortions can be heard, either the amplifier or the loudspeaker is overloaded. Overloads can quickly lead to
amplifier or speaker damage. In order to avoid damage, please reduce the volume immediately when distortions
can be heard. When speaker systems are destroyed by overload, the guarantee becomes void. Always check the
sound pressure level with a meter in order to keep to the threshold.
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8
PROTECTIVE CIRCUITS
The integrated protective circuits prevent damage to the speakers and the amplifier. If activated, the
speakers are electrically separated from the amplifier and the protect indicator
PROT
lights up:
•
for approx. 10 seconds after switching-on until the speaker outputs are ready for operation
•
in case of overheating of the amplifier
•
in case of a VHF signal above 10 kHz at a speaker output
•
in case of a short-circuit at a speaker output
•
in case of a DC voltage at a speaker output
If the red protect indicator
PROT
lights up during operation or if it does not extinguish after switching on, the
amplifier has to be switched off and the cause of the fault has to be removed.
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9
PROBLEM CHART
PROBLEM
CAUSE
REMEDY
No power.
•
The power cord is not connected.
•
Check the power cord and any
extension cables.
No sound.
•
The power cord of the respective
device is not connected properly or
not connected at all.
•
The connection socket or the plug is
dirty.
•
Check the power cord and if the
plugs are tightly connected with the
sockets.
•
Clean the socket and/or the plug.
Fans do not work, LEDs do
not light up.
•
The power cord is not connected.
•
Please check if the power is
available
Protect LED lights up
permanently.
•
Amplifier is overheated due to
impurities.
•
Impedance of speakers too low.
•
Short-circuit in speaker connection
or in speakers.
•
Technical default of amplifier.
•
Clean the fan grille.
•
Connect other speakers.
•
Check speakers.
•
Switch amplifier off and have the
device checked by a service
technician.
