15
Teufel
·
Theater 4 Hybrid
The subwoofer is producing a humming noise
Hum may be caused by any connected audio device
as well as by problems with the mains power. In most
cases, excessive hum is caused by one of the follow-
ing:
1.
The subwoofer is connected to a different elec-
trical 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 system or
TV has a different ground potential to the an-
tenna socket. To test this, simply disconnect 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).
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.
If possible:
Unplug the mains cable, rotate the
connector 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 cinch cable from
the receiver to see whether the hum is caused by
one of the other connected devices – LCD/plasma
screens can be particularly noisy.
The subwoofer is not working
If the Power LED on the rear
panel does not light up, re-
place the fuse with a fuse of
equal rating (see page 14,
I
).
If the Power LED lights up, un-
plug the subwoofer cinch ca-
ble from the amplifier, set the “Bass Level” control to
+3 dB, and touch the tip of the cinch connector with
your finger. If this produces a hum or crackle, the
fault is with the amplifier or the amplifier settings.
If the subwoofer remains completely silent, please
contact our support team.
Problems and solutions
