Behringer EUROLIVE PROFESSIONAL B2520 PRO/B1800X PRO/B1520 PRO/B1220 PRO/B2520/PRO/B1800X PRO/B1520 PRO/B1220 - Manual (Page 9)

9 EUROLIVE B2520 PRO/B1800X PRO/B1520 PRO/B1220 PRO User Manual
Troubleshooting 7.
No signal when loudspeaker is connected 7.1
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 somewhere 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.
Signal present only on one channel 7.2
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.
Signal distorted 7.3
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 frequencies 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 somewhere along
•
the path.
Treble signal too low 7.4
Check the EQ settings on your mixing console or on an external EQ, •
if applicable.
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.
The internal tweeter fuse may have opened. In this case, please contact a
•
BEHRINGER service branch office near you.
Bass signal too low 7.5
Check the EQ settings on your mixing console or on an external EQ, •
if applicable.
Check the speaker cable pin assignment (see fig. 1.3). Incorrect pin
•
assignment can cause phase cancellation and the frequency incursions
related to it.
Poor sound characteristics 7.6
Check the speaker cable pin assignment (see fig. 1.3). Incorrect 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 negatively 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.
•