Troubleshooting; No Signal When Loudspeaker Is Connected; Signal Present Only On One Channel; Signal Distorted - Behringer Eurolive B1220 Pro User Manual

EUROLIVE PROFESSIONAL SERIES
7.

Troubleshooting

7.1

No signal when loudspeaker is connected

= Make sure that your mixing console is indeed carrying a signal
(is the master fader raised? Are channels active?) and that
the gain control on your amp is turned up.
When using a crossover, make sure that the relevant channels
=
are active.
Check if the cable connection is interrupted/damaged some-
=
where in your setup.
= To test your configuration, connect another amp. If you now
get a signal, the power amp is the culprit.
= To test your configuration, connect another speaker. If you
now get a signal, the fault lies within the speaker.
7.2

Signal present only on one channel

= Make sure that your mixing console is working properly (is the
signal present on both outputs (L/R)?).
= If using a crossover, check if the relevant channel is active.
= Check if the cable connection to the silent channel and to the
corresponding speakers is interrupted/damaged somewhere
along the path.
Connect the silent loudspeaker onto the amp channel that
=
works properly. If you now get a signal, it is the amp channel
that is at fault. If you still can not hear anything, the fault lies
either within the loudspeaker or the cables used.
7.3

Signal distorted

= Make sure that all signals on the mixing console have been
set to optimal levels in order to avoid distortion.
= If using a crossover, check if all signals have been set to
correct levels.
= Make sure that the power amp channels are not overdriving.
If so, turn the gain control down a little. However, it could also
be the case that your power amp doesn't have enough power
headroom, so that the required volume can not be generated
without starting to distort.
Make sure that the level of the signal getting into the speakers
=
is not too high, causing distortion.
Check your EQ settings. Excessively increasing the frequen-
=
cies can result in distortion.
If distortion is still occurring despite everything you have tried
=
to eliminate it, try connecting a different power amp. If you no
longer hear distortion, its cause was with the power amp.
= As a test, connect another speaker. If you no longer hear
distortion, its cause was with the loudspeaker (perhaps a
defective loudspeaker).
Check if the cable connection is interrupted/defective some-
=
where along the path.
7.4

Treble signal too low

Check the EQ settings on your mixing console or on an ex-
=
ternal EQ, if applicable.
Make sure that the tweeters on your loudspeakers are po-
=
sitioned at the same height as the ears of the people in the
audience. If not, please modify the speaker position.
= The internal tweeter fuse may have opened. In this case,
please contact a BEHRINGER service branch office near
you.
7.5

Bass signal too low

Check the EQ settings on your mixing console or on an ex-
=
ternal EQ, if applicable.
Check the speaker cable pin assignment (see fig. 1.3). Incor-
=
rect pin assignment can cause phase cancellation and the
frequency incursions related to it.
8
7.6

Poor sound characteristics

= Check the speaker cable pin assignment (see fig. 1.3). Incor-
rect pin assignment can cause phase cancellation and the
frequency incursions related to it.
Check if large objects (e.g. effect racks and similar equipment)
=
are placed in front of the loudspeakers. They too can nega-
tively influence sound dispersion.
= Check the sound quality of the input signal by listening to it
on a set of headphones.
= Also see the instructions in the chapters 7.3, 7.4 and 7.5.
Troubleshooting