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EPX Series Power Amplifiers
User Manual
9
Operating instructions
Operation
After having connected your amplifier to the mains, turn both gain controls counter clockwise to the
“min”
position. The last product to be switched on is amplifier. The
“ON”
and
“PROTECT”
LED lights 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 to the
“OFF”
position, turn the gain controls of
your amplifier to mid-position. Now adjust the volume with the gain controls CH A and CH B.
All important operating modes of the amplifier are arranged on the front panel.
If you want to switch off the system,
switch off the amplifier first
in order to avoid
acoustic shocks on the speakers.
Problem Chart
-20 dB to 30dB
- 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 is activated
Problem
Cause
Solution
No power
The power cable is not connected
Check the power cable and any extension cables
No sound
The power cable of the respective product is
not connected correctly or not at all.
Check the power cable and if the plugs are properly
connected with the sockets
The connection socket or the plug is dirty
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 cable is not connected
Connect the power cable
Protect LED lights
up permanently
DC voltage on input
Switch amplifier off and have the product checked
by a service technician
Amplifier overheats due to obstruction
Clean the fan grill
Impedance of speakers too low
Ensure minimum 4Ω load
Short circuit in speaker connection
or in speakers
Check speakers and connections
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