Corrective maintenance
Sound issues
no sound with no error message
(amplied controller is not in standby mode. Refer to the LA Network Manager help)
possible cause diagnosis / procedure
mains failure Inspect the mains.
outputs are muted Unmute the outputs.
incorrect input mode
If the fallback mode is ON, switch it OFF.
Select the input mode according to the audio source format
(analog or AES/EBU).
incorrect preset selection
Select a preset in accordance with the loudspeaker system
connected to the outputs.
gain value is too low on the amplied controller
Set an appropriate gain value on channels OUT1 to
OUT4.
If the AES/EBU input mode is selected, set an appropriate
AES/EBU input gain value.
audio source is not plugged, incorrectly plugged, or
plugged into the wrong input connector
Plug/Replug and secure each XLR cable into the audio
source and the corresponding input connector on the
amplied controller (analog input connector for analog
audio source, AES/EBU input connector for AES/EBU
audio source).
audio source cable is damaged Replace the XLR cable.
incorrect settings on the audio source
Set appropriate parameter values on the audio source,
in particular the output gain value (refer to the third-party
documentation).
non-audible bit stream
Check that the AES/EBU source does not deliver non-audio
bit stream (for example encoded audio).
audio source failure
Inspect the audio source for failure.
Reminder: A digital audio source can meet the following
failures: no clock, loss of lock, invalid audio (validity bit),
CRC error, bipolar encoding error, data slip.
loudspeaker not plugged, incorrectly plugged, or plugged
into the wrong output connector
Plug/Replug and secure each speakON cable into the
loudspeaker and the corresponding output connector on
the amplied controller.
loudspeaker cable is damaged Replace the loudspeaker cable.
loudspeaker is damaged If only one loudspeaker is connected, inspect it.
other causes Contact L-Acoustics.
66 LA4X owner's manual (EN) version 14.1
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