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· Concept E
»The subwoofer is buzzing«
The Concept E 100/200/300/400 has a power-
ful transformer and a generously proportioned
power pack that make its high output perform-
ance possible. These components can produce a
very quiet, unobtrusive buzzing sound that can
be detected a short distance from the side of
the subwoofer in quiet rooms in the absence of a
signal. During operation this minimal buzzing will
disappear as it is masked by the sound output.
On the other hand, if the buzzing can clearly be
heard from a distance of more than a metre and/
or can also be heard from the satellites, there
is possibly a fault assuming the subwoofer is
not touching other appliances. In some cases, it
could come from connection to other appliances,
through equalising currents that are caused by
different casing potentials or similar. Please read
the following instructions for a solution to the
case above:
1. The subwoofer is connected to a different
power circuit from the rest of the equipment.
Ensure that all linked appliances (including
the PC if connected) are connected to a sin-
gle power circuit or plug.
2. The aerial connected to the equipment or TV has
a different ground potential than the socket. To
test this, simply remove all aerial cables from the
wall socket. If the interference stops, you need a
sheath current filter (available for around 5–10
euro from electronics retailers). Insert the filter
between the aerial socket and the TV or receiv-
e r.
3. A mains filter that can be bought separately, to
which all appliances must be connected, may be
useful in eliminating the buzzing. Please ensure
you have the right to return the filter if it fails to
yield positive results.
4. In some cases a multi-socket extension has
been shown to cause the buzzing. To test
this, disconnect the plug strip and plug the
subwoofer’s mains plug directly into a wall
socket.
5. You can also try turning the mains plug
around and inserting it into the socket the
other way up, inasmuch as your mains plug/
socket allows this.
6. To narrow down the source of the buzzing,
plug the subwoofer in to the power socket in
another room (e.g. using an extension lead)
and check if the buzzing can still be heard.
You should also try disconnecting the cinch
connection between the subwoofer and the
PC/DVD player/receiver in order to cross off
interference by other connected compo-
nents.
7. It can be useful to create an additional earth
by fixing a cable (e.g. speaker cable) to the
metal screw of the power amplifier and fixing
the other cable end e.g. to the heating pipe or
PC casing.
»There is no sound neither from the satellites
nor the subwoofer«
Please check to see if the
LEDs on the front of the
subwoofer display are il-
luminated; if not, change
the fuse. The main fuse
on the subwoofer might
have blown as a result of
a power surge. The fuse
compartment on the
Concept E subwoofer is
underneath the IEC power connector (see illustra-
tion on page 16, item T). Always disconnect the
subwoofer from the mains supply before replacing
the fuse! Use a small screwdriver to open the lid,
replace both fuses and return the fuse holder to
the fuse compartment. The subwoofer should now
be ready for use again.
»There is no sound from one of the satellites,
or the sound is distorted all of the other sat-
ellites are working«
In order to pinpoint the defect more specifi-
cally, please swap the non-functioning satellite
for a functioning satellite in order to determine
whether the defect is in the satellite or the sub-
woofer. If the non-functioning satellite now plays
on a different subwoofer channel, the fault is
probably with the subwoofer electronics. If the
satellite fails to play on a different channel, the
satellite itself is faulty.
»There is no sound from the subwoofer all of
the other satellites are working«
You can check the function of the subwoofer by
connecting the subwoofer cinch input on the sub-
woofer only to the output from one of the front
channels L/R front on the sound card or a device
such as a portable CD player. If the subwoofer now
Troubleshooting
18


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