Troubleshooting - ELAC SUB 211 D Bedienungsanleitung

Troubleshooting

Symptom working state
No signal
No signal
No signal
No signal
Output level too low
(speaker cable)
Output level too low
(RCA jack)
max output slightly too low
(living-room)
Uneven sound
Sound during loud tracks
somewhat distorted espe-
cially in surround mode loud
buzzing noises
Loud hum
Soft hum (during pauses)
Possible problems
Mains fused released
No mains fuse connection
Power mode switch in OFF position
No input signal
One channel inverted
Output level from source is too low (pre-
amp, surround decoder)
Placement of subwoofer too „open"
Unfavourable polarity
Overdrive of centre or effect speakers
and their power amps
Contact problems with RCA connector
(adapter for extensions)
Hum for source, ground loop with RCA
multi-connections
Solution
Check/replace mains fuse
Check mains switch, plugs and socket
Switch MODE switch to AUTO or ON
Check input connections, exchange
RCA connector, check source signal (is
a different audio component fed by the
same source playing correctly?)
Disconnect one channel, is the bass
level higher now? Connect 2
again, but now with inverted polarity,
check cables for polarity error
Increase output level of pre-amp (min
0.2 Volts), reduce power amp again for
compensation or: slightly reduce again
for main (centre, effect) speakers, for
compensation increase master volume
Place subwoofer in front of a wall or a
corner.
Switch polarity, if no signal difference,
move subwoofer by 0.5 – 2m and re-
peat.
Reduce centre or effect level at surround
decoder; use centre mode 'normal'
Check all connections; reduce the level
an ELAC sub to -30dB; the outer rings of
the RCA plugs may have to be re-
adjusted.
Check of ELAC sub for inherent hum:
switch MODE to OFF, disconnect all
inputs, switch to ON, normal settings.
Now, with the ear near the speaker there
may be a soft hum, but none at the
listening place.
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