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ENG
Problem
Possible cause
Subwoofer
1. The power cable is not connected from the socket to the
does not turn
subwoofer
on
2. The power has not been turned on
3. The switch for automatic switching on is not in the "ON"
position or the "AUTO" or "AUTO HIGH" positions.
4. The subwoofer is not connected with the amplifier (re-
ceiver) through its speaker outlet (High level) or subwoofer
outlet (cinch) cable
5. Defective signal line (cinch)
6. The volume of the amplifier has been set too low
7. With a "Dolby Digital" receiver (amplifier): the receiver is
not set for subwoofer operation (operating method "Small"
or "ActiveSub = On")
8. The outlet level on the amplifier is set too low for the
subwoofer outlet (cinch outlet)
9. The microfuse in the subwoofer has blown (fused)
1. Switch for automatic switching on (Standby) set to "ON"
Subwoofer
does not
2. Constant humming at inlet of subwoofer
switch off
Subwoofer
1. Signal line from amplifier to subwoofer too long
hums
2. Signal line used is not fault-protected or the protection
has been damaged (defective)
3. ground loop (ripple pickup) generated
4. Another piece of equipment on the same circuit has no
interference suppression (e. g. fridge)
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Solution
Check connection
Switch to "ON"
Check switch setting
Check connection
Test with another cinch cable and change cable if necessary
increase volume level to test
Check operating mode
increase the outlet level of the amplifier
get a specialist to change the microfuse
Switch to "Auto" or "OFF"
use a shorter signal line from the amplifier to the subwoofer or remove any possible sources of
interference (see "Subwoofer hums")
use shorter signal line
Change signal line for a fault-protected line
A ground loop can be generated when two or more devices connected via a signal line (cinch)
are plugged into separate sockets (e. g. amplifier and computer). All devices connected to the
amplifier should be plugged into the same multiple socket outlet
Switch off possible sources of interference to test; unplug the device concerned to see if the
humming noise disappears or connect the source of interference to a different circuit (l1, l2
or l3). (Where necessary take advice from your electrician.)
Insert a special "ferrite common mode filter" (available from specialist retailers) between the
amplifier and the subwoofer to eliminate the humming
Disconnect and rotate the mains plug to reduce the so-called ripple voltage.
(Particularly important if the amplifier is not earthed)
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