Overhead Installation - Omnitronic PAS-15 User Manual

Speaker-systems

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possible from the speaker-systems. When using the speaker-system as monitor-system make sure to avoid

feedbacks.

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. A Full Range speaker-system should be installed at listeners' eye level.

Please refer to the safety instructions under Installation.

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 feedbacks

One of the most frequent problems when operating speaker-systems are feedbacks. They can be

recognized by howling and growling loudspeakers. Feedbacks are created then 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. A feedback

never cover 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 feedbacks, bass-hum or the beats of a dropping microphone can destroy the

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 Compressor/limiters.

Installing the speaker-cables

Connect the speaker-systems among each other using the inputs and outputs. Connect the cable of the first

speaker-system with the Speaker-socket Output CH-1 and Output CH-2 of the amplifier. The signal will be

transmitted to the individual speaker-systems.

Always treat the cables carefully and protect them from damages during transportation.

Install the cables always in a structured way and protect them from damage.

The cables must be installed in a way that no person can stumble over them. Always fix the cables with an

appropriate tape.

Both cables should be of the same kind.

Both cables should have the same length.

Both cables should be installed directly (no loops, S-shaped overlengths)

Always install the cables far away from power cables (never closely parallel)

Never put heavy objects like speaker-systems, flightcased etc. on cables.

Never wind up cables tightly around the elbow, but rather sleek with an interior diameter of 20 to 30 cm.