Omnitronic AS-800, Руководство пользователя

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5. INSTALLATION
The satellite speakers can be placed as desired or put onto a PA speaker stand via the stand flange on the
lower side. For optimum sound, place the subwoofer centrically between the two satellite speakers. Roll it to
the desired installation area and carefully turn it onto the standing feet. To prevent accidental displacement,
two of the castors on the base of the subwoofer are provided with brakes.
Always install the PA system at a solid, plane, anti-slip, vibration-free, oscillation-free and fire-resistant
location. Before installing the system, make sure that the installation area can hold a minimum point load of 5
times the system's load (e.g. weight 20 kg - point load 100 kg). The speaker systems must never be installed
higher than 100 cm without secondary attachment.
5.1 Installing and orienting the PA system
When installing a speaker system on e.g. a stage, microphones and turntables should always be located
behind the speaker systems. This way, you can avoid dangerous and unpleasant feedback. If you cannot
install the speaker systems this way, the microphones and turntables should be located as far away as
possible from speaker systems. The speaker systems of a PA system are normally located left and right to
the stage. Do not install the speaker systems on the stage, but rather on appropriate tables or platforms in
front of the stage. In order to produce a clear sound, the speaker systems should be installed in a way that
they throw the sound over the audience's heads.
5.2 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. Never hold microphones directly in front of the speaker system!
Extreme levels like feedback, bass hum or the beats of a dropping microphone can destroy the loudspeakers
within a very short time and produce immediate hearing damage. Such extreme levels must be avoided at
any rate. We recommend using appropriate equalizers and compressors/limiters.