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8.4 Switching on the limiter
The integrated limiter reduces the input signal if a limit level at the output is reached. This will prevent
distortions and protect the connected speakers. With the selector switch LIMITER it is possible to switch on
the limiter circuit.
• left position:
limiter is switched off
• right position: limiter is switched on
8.5 Ground lift switch
If an interfering hum noise can be heard without a music signal, a ground loop may be the reason for this.
The ground lift selector switch allows for interrupting the ground loop and the humming should be eliminated.
For this purpose the set the selector switch to position LIFT. Thus signal ground and housing ground are
separated.
9 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 lights up:
• for a few seconds after switching-on until the speaker outputs are ready for operation
• in case of overheating of the amplifier
• 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 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.
10 PROBLEM CHART
PROBLEM
No power.
No sound.
Fan does not work, LEDs
do not light up.
Protect
LED
lights
permanently.
CAUSE
The power cord is not connected.
•
The power cord of the respective
•
device is not connected properly or
not connected at all.
The connection socket or the plug is
•
dirty.
The power cord is not connected.
•
up
Inputs receive DC voltage.
•
Amplifier
is
overheated
•
impurities.
Impedance of speakers too low.
•
Short-circuit in speaker connection or
•
in speakers.
Technical default of amplifier.
•
Check the power cord and any
•
extension cables.
Check the power cord and if the
•
plugs are tightly connected with the
sockets.
Clean the socket and/or the plug.
•
Please
•
available
Switch amplifier off and have the
•
device
technician.
due
to
Clean the fan grille.
•
Connect other speakers.
•
Check speakers.
•
Switch amplifier off and have the
•
device
technician.
28/31
REMEDY
check
if
the
power
checked
by
a
service-
checked
by
a
service
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is
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