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OPERATION
After having connected your amplifier to the mains, turn both gain controls counter-clockwise to Min-position.
The last device to be switched on is the amplifier. The "ON" and "PROTECT" LED light up now. If it does not,
check if the amplifier is connected to the mains correctly.
After the turn-on delay the speakers are activated (PROTECT-LED is off).
After having set the volume controls of the pre-amplifier in null-position, turn the gain controls of your
amplifier to mid-position. You must not hear any loud humming. If there is humming nevertheless, check the
connecting cables between the pre-amplifier and the amplifier. Now adjust the volume with the gain controls
CH-1 and CH-2.
All important operating modes of the amplifier are arranged on the frontpanel.
-20 dB to 30 dB output level
CLIP short-circuit or impedance too low or signal distorted
PROTECT active during stabilisation period after switching on or when one of the
protective circuits started
If you want to switch off the system, switch off the amplifier first and then the pre-amplifiers in order to
avoid acoustic shocks on the speakers.
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.
Noise. • The input-signal is too strong. • Reduce the input-signal via the Gain-
control.
Fan does 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
• Inputs receive DC-voltage.
• Amplifier is overheated due to
impurities.
• Impedance of speakers too low
• Short-circuit in speaker connection or
in speakers
• Technical default of amplifier
• Switch amplifier off and have the
device checked by a service-
technician.
• Clean the fan-grille.
• Connect other speakers.
• Check speakers.
• Switch amplifier off and have the
device checked by a service-
technician.
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