3
59
English
Problem
Possible cause
Solution
Loudspeaker system
hums
1� Signal cables from source device to loud-
speakers system too long (Aux)�
1� Use shorter signal cable�
2� Signal cable is not shielded or shielding has
been damaged (defective)�
2� Exchange the signal cable by a shielded one�
3� Ground loop (ripple pickup) generated�
3� A ground loop can be generated when two or more devices
connected via a signal line (cinch) are plugged into separate
sockets (e� g� amplifier and computer)� Connect all the
devices connected with the loudspeaker system to a multiple
socket strip using a safety plug�
4� Another piece of equipment on the same
circuit has no interference suppression
(e� g� fridge)�
4� Switch off possible sources of interference to test; unplug
the device concerned to see if the humming noise disap-
pears or connect the source of interference to a different
circuit (L1, L2 or L3)� (Where necessary take advice from
your electrician�) Insert place a sheath current filter“ (avai-
lable from specialist retailers) between the source device
and the loudspeaker system to eliminate the humming; flip
the mains plug round to reduce the so-called ripple voltage
(particularly important if the source device is not earthed)�
Summary of Contents for C 500 Aktiv
Page 33: ...31 English C 5 0 0 A k t i v...
