12
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Concept R 2
Problems and solutions
If you have any questions, suggestions or criticisms, please contact our support team:
No responsibility can be accepted for
the correctness of this information.
Subject to technical changes. Errors
and omissions excepted.
Lautsprecher Teufel GmbH
Gewerbehof Bülowbogen · Bülowstraße 66
10783 Berlin· Germany
Ph.: +49(30) 30 09 30 0
Fax: +49(30) 30 09 30 30
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The subwoofer is not working
If the Power LED does not
light up, replace the fuse
(see page 11, point 9).
Make
sure
that
the
replacement fuse has the
same rating as the defective
fuse.
If the Power LED lights up, set the subwoofer vo-
lume level to "Min", unplug the subwoofer RCA
cable from the amplifier,turn up the volume
slightly and touch the tip of the RCA connector
with your finger. If this produces a hum or crackle,
the fault is with the amplifier or the amplifierset-
tings. If the subwoofer remains completely silent,
please contact our support team.
The subwoofer is making a humming noise
Hum may be caused by any connected audio de-
vice as well as by problems with the mains power.
In most cases, excessive hum is caused by one of
the following:
1
The subwoofer is connected to a different
electrical circuit than the other components.
Make sure that all connected devices (including
your computer) are powered from the same
electrical circuit, i.e., the same mains socket.
2
The antenna connected to the audio sys-
tem or TV has a different ground potential to
the antenna socket. To test this, simply discon-
nect all the antenna cables from the wall socket.
If this makes the hum disappear, you will need a
ground breaker (available from most electronics
stores for EUR 5.00–10.00). Simply insert the
ground breaker between the antenna socket and
the TV/receiver.
3
A line filter (to be purchased separately) can
also be useful for hum removal. Note that you
will need to connect all your electrical devices
to the line filter. Make sure you can return the
line filter for a refund if it does not produce
the desired results.
4
Some types of power multiboxes are also
known to produce hum. Try eliminating your
multibox and plug the subwoofer's power cable
directly into the mains socket.
5
Unplug the mains cable, rotate the connec-
tor plug by 180°, and plug it back into the
mains socket.
6
If you have trouble locating the source of the
hum, check whether the subwoofer is less noisy
when you plug it into the mains connection in
another room (e.g., using an extension cable).
Also, try disconnecting the subwoofer's RCA
cable from the receiver to see whether the hum
is caused by one of the other connected audio
devices.
