Bedienungsanleitung Teufel Kompakt 30 (Seite 11 von 12) (Englisch)

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· Kompakt 30

“The subwoofer is making a humming noise“

The Kompakt 30 system employs a powerful trans-

former and an amply sized power pack, which are

necessary to produce the system's high output.

These components may cause a barely inaudible

constant hum, which you may be able to hear

from the rear of the subwoofer when there is no

music or other sound in the room. This electri-

cal hum can only be avoided using very expensive

high-end componentry, and it is perfectly normal

for the large majority of active speakers. As soon

as the loudspeakers receive a signal, the hum is

masked by the audio output and disappears.

However, if the hum remains clearly discernible

from further than one metre away, this may in-

dicate a fault – especially if the subwoofer is not

connected to any other devices. If the subwoofer

is already connected to other devices, the hum

may be caused by an equalising current, e.g., be-

cause the external devices have differing electric

potentials.

If you think this may be the case, try the following

methods to remove the hum:

1. The subwoofer is connected to a different elec-

trical circuit than the other components. Make

sure that all the connected devices (including any

computers) 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).

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 connector

plug by 180° (if your mains socket allows it), 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 an-

other 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.

7. Try adding an additional earthing signal; fasten

a wire (e.g., spare speaker cable) to one of the am-

plifier's metal screws, and fasten the other end to

a ground point (e.g., heater pipe, computer hous-

ing).

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Teufel Kompakt 30 Seite 11

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