Behringer B1220 PRO ユーザーガイド

EUROLIVE PROFESSIONAL SERIES

Troubleshooting

8

Make sure that your mixing console is indeed carrying a signal 

 

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(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 

 

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are active.
Check if the cable connection is interrupted/damaged some-

 

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where in your setup.
To test your configuration, connect another amp. If you now 

 

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get a signal, the power amp is the culprit.
To test your configuration, connect another speaker. If you 

 

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now get a signal, the fault lies within the speaker.

Make sure that your mixing console is working properly (is the 

 

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signal present on both outputs (L/R)?).
If using a crossover, check if the relevant channel is active.

 

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Check if the cable connection to the silent channel and to the 

 

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corresponding speakers is interrupted/damaged somewhere 

along the path.
Connect the silent loudspeaker onto the amp channel that 

 

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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.

Make sure that all signals on the mixing console have been 

 

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set to optimal levels in order to avoid distortion.
If  using  a  crossover,  check  if  all  signals  have  been  set  to 

 

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correct levels.
Make sure that the power amp channels are not overdriving. 

 

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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 

 

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is not too high, causing distortion.
Check your EQ settings. Excessively increasing the frequen-

 

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cies can result in distortion. 
If distortion is still occurring despite everything you have tried 

 

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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 

 

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distortion,  its  cause  was  with  the  loudspeaker  (perhaps  a 

defective loudspeaker).
Check if the cable connection is interrupted/defective some-

 

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where along the path. 

Check the EQ settings on your mixing console or on an ex-

 

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ternal EQ, if applicable.
Make sure that the tweeters on your loudspeakers are po-

 

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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, 

 

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please  contact  a  BEHRINGER  service  branch  office  near 

you.

Check the EQ settings on your mixing console or on an ex-

 

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ternal EQ, if applicable.
Check the speaker cable pin assignment (see fig. 1.3). Incor-

 

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rect pin assignment can cause phase cancellation and the 

frequency incursions related to it.

Check the speaker cable pin assignment (see fig. 1.3). Incor-

 

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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) 

 

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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 

 

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on a set of headphones.
Also see the instructions in the chapters 7.3, 7.4 and 7.5.

 

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