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Trouble shooting
What to do if the subwoofer...
... does not switch on
1.1
Is the mains cable connected to the power outlet and to the
subwoofer ?
1.2
Is the mains switch switched on ?
1.3
Is the switch for automatic switch-on set to „On" or „AUTO"?
1.4
Is the subwoofer connected to the amplifier (receiver) via its
loudspeaker output (high level) or subwoofer output (Cinch) ?
1.5
Is the signal line (Cinch) defective ? Use another Cinch cable to
test this !
1.6
Is the signal level setting at the amplifier (volume) too low ? Try
increasing the volume level !
1.7
Do you have a „Dolby digital" receiver (amplifier) ? Check
whether it is set to subwoofer operating mode („Small" or „ActiveSub =
On").
1.8
Is the output level at the amplifier set too low for the subwoofer
output (Cinch output) ? Check the output level of the amplifier!
1.9
Has the equipment fuse blown in the subwoofer (fuse
„blown")? This can also happen without a fault in the subwoofer, e.g.
due to ageing or excessive voltage (lightning). Get the fuse replaced by a
technician !
... is not loud enough
2.1
Is the level control at the subwoofer (volume) set too low ? Turn
it slowly in the clockwise direction !
2.2
Are both inputs of the subwoofer (right and left) connected ?
Use a so-called Y-cable if only one Cinch input is connected (this cable
must have one Cinch socket and two Cinch plugs, and is available from
your dealer), or install a second loudspeaker cable from the amplifier to
the subwoofer if you are using the high level inputs !
2.3
Only for the high level input: Is one of the two inputs connected
with reversed polarity ? The outputs of the amplifier designated with red
colour or + must be connected to the red input sockets of the
subwoofer! Check the polarity (phase)!
2.4
See also case 1.8 above ! If the signal level of the subwoofer
output cannot be increased any more, instead reduce the signal levels of
the other outputs by the same amount each !
... reproduces mains hum
3.1
Are the signal lines from the amplifier to the subwoofer longer
than necessary ? Use shorter signal lines !
3.2
Is your signal line not shielded, or is the shield of your line
interrupted (defective) ? Replace the signal line with a properly shielded
one !
3.3
Have you „produced" a ground loop ? A ground loop can result
when two or more devices connected via signal lines (Cinch) are
connected to mains power outlets with mains grounding contact in
different places (e.g. amplifier and computer). Connect all devices which
are connected to the amplifier, via grounded mains plugs to the same
strip of power outlets (multiple mains voltage distribution strip) !
3.4
Is a consumer device (such as a refrigerator) without interference
suppressor connected to the mains? Test by switching off the possible
sources of disturbance. If the hum disappears when a particular device is
switched off, get it fitted with interference suppression, or try connecting
it to a different phase line of the supply mains (consult an electrician if
necessary).
3.5
Interpose a so-called „sheath current filter" between the
amplifier and the subwoofer to suppress the hum. This filter is available
from your dealer.
... does not switch off
4.1
Is the switch for automatic switch-on (standby) set to „ON"? Set
this switch to „Auto" or „OFF" !
4.2
Is there a continuous hum signal (ripple signal) at the input of
the subwoofer ? In this case investigate 3.1 to 3.4 above !
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