Problem Possible cause Solution
Speaker system
is buzzing�
1� Signal cables from the source device to the
speaker system too long (Analog Line)�
1� Use shorter and/or higher quality signal cables�
2� Used signal cable not shielded or the shield on
the cable used is interrupted (defective)�
2� Replace the cable with a shielded
and/or higher quality cable�
3� Ground loop (hum loop) “generated”�
A ground loop can occur if at least two
interconnected devices with safety plugs
(e�g� amplifier and computer) are connected
to locally separated power outlets�
3� Connect all devices connected to the speaker system
with a safety plug to a power strip (multiple socket)�
4� A non-interference suppressed consumer
(e�g� fridge) on the same mains phase�
4� For testing purposes, turn off any possible sources of
interference; have the relevant device suppressed for
interference, if the humming sound disappears, or initially
connect the source of interference to another mains phase
(L1, L2 or L3) (consult a specialist if necessary); Insert a
special “sheath current filter” (available from specialist
retailers) between the amplifier and the speaker system
to eliminate the humming� Turn the power plug round to
reduce the so-called hum voltage (particularly important
if the source device is not earthed)�
The speaker system
unintentionally swit-
ches to the BT input�
1� This can happen when your mobile device
issues system sounds, such as typing on the
keyboard�
1� Deactivate the function BTS
(setting on MAN, see Page 80)�
1�1� Disable these system sounds on your end device�
The speaker system
unintentionally
switches on�
2� This can happen when your mobile device is
playing system sounds such as when typing on
the keyboard, a digital source is turned on, or
an analog source is playing�
2� Change the standby function (ECO, MAN or NSB)�
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