Stacking - Omnitronic PAS-151 PRO Bedienungsanleitung

Loudspeaker combinations need to be installed bass, middle, high (from bottom to top). Make sure that the
membranes of all speakers are in one line vertically and horizontally. Only in this way all frequency ranges
are produced at the same time and without any time or phase delays.
Always install the speaker systems in a way that a minimum distance of three meters to the audience is kept.
This is the only way to avoid hearing damage for unreasonable listeners. Block the area in front of the
speaker systems with appropriate means.
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, then a signal is recorded by a microphone,
amplified, reproduced by a loudspeaker and then again recorded by the microphone.
The prerequisite for feedback is that the reproduced 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.

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).
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