Omnitronic BX-series, User Manual

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00032561.DOC, Version 1.3 20/29
Avoiding feedback
One of the most frequent problems when operating speaker systems is feedback. It can be recognized by
howling and growling loudspeakers. Feedback is created when a signal is recorded by a microphone,
amplified, played back by a loudspeaker and then again recorded by the microphone.
The prerequisite for feedback is that the played back signal is louder than the original signal. Feedback
never covers the whole frequency range but only one overboosted frequency.
Make sure that you install especially the monitor speakers so far away from the microphone that another
recording of the microphone signal is impossible.
Extreme levels like feedback, bass hum or the beats of a dropping microphone can destroy loudspeakers
within very short time and produce immediate hearing damage. Such extreme levels must be avoided at any
rate. We recommend to use appropriate equalizers and compressors/limiters.
Use in public areas
Please note: When using this speaker system in public or industrial areas, a series of safety instructions
have to be followed that this manual can only give in part. The operator must therefore inform himself on the
current safety instructions and consider them.
DANGER TO LIFE!
Please consider the EN 60598-2-17and the respective national norms during the installation!
The installation must only be carried out by an authorized dealer!
The operator has to make sure that safety-relating and machine-technical installations are approved by an
expert before taking into operation for the first time and after changes before taking into operation another
time.
The operator has to make sure that safety-relating and machine-technical installations are approved by an
expert after every four year in the course of an acceptance test.
The operator has to make sure that safety-relating and machine-technical installations are approved by a
skilled person once a year.
The speaker system should be installed outside areas where persons may walk by or be seated.
The speaker system has to be installed out of the reach of people.
DANGER TO LIFE!
Before taking into operation for the first time, the installation has to be approved by an expert!
Stacking
Speaker systems may only be installed on top of other speaker systems if the systems are protected against
slipping and flipping over (e.g. via appropriate clamping belts).