Behringer E1220 - Manual (Page 8)

8
EUROLIVE PERFORMER SERIES
7. TROUBLESHOOTING
7. TROUBLESHOOTING
7.1 No signal when loudspeaker is connected
s 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.
s When using a crossover, make sure that the relevant
channels are active.
s Check if the cable connection is interrupted/damaged
somewhere in your setup.
s To test your configuration, connect another amp. If you
now get a signal, the power amp is the culprit.
s 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
s Make sure that your mixing console is working properly (is
the signal present on both outputs (L/R)?).
s If using a crossover, check if the relevant channel is active.
s Check if the cable connection to the silent channel and to
the corresponding speakers is interrupted/damaged
somewhere along the path.
s 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
s Make sure that all signals on the mixing console have been
set to optimal levels in order to avoid distortion.
s If using a crossover, check if all signals have been set to
correct levels.
s 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.
s Make sure that the level of the signal getting into the speakers
is not too high, causing distortion.
s Check your EQ settings. Excessively increasing the
frequencies can result in distortion.
s 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.
s As a test, connect another speaker. If you no longer hear
distortion, its cause was with the loudspeaker (perhaps a
defective loudspeaker).
s Check if the cable connection is interrupted/defective
somewhere along the path.
7.4 Treble signal too low
s Check the EQ settings on your mixing console or on an
external EQ, if applicable.
s Make sure that the tweeters on your loudspeakers are
positioned at the same height as the ears of the people in
the audience. If not, please modify the speaker position.
s 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
s Check the EQ settings on your mixing console or on an
external EQ, if applicable.
s Check the speaker cable pin assignment (see fig. 1.3).
Incorrect pin assignment can cause phase cancellation
and the frequency incursions related to it.
7.6 Poor sound characteristics
s Check the speaker cable pin assignment (see fig. 1.3).
Incorrect pin assignment can cause phase cancellation
and the frequency incursions related to it.
s Check if large objects (e.g. effect racks and similar
equipment) are placed in front of the loudspeakers. They
too can negatively influence sound dispersion.
s Check the sound quality of the input signal by listening to it
on a set of headphones.
s Also see the instructions in the chapters 7.3, 7.4 and 7.5.