Installation; Avoiding Feedback - Omnitronic KM Serie Bedienungsanleitung

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INSTALLATION

The stage monitors can be placed as desired or put onto a PA speaker stand via the stand flange on the
lower side. Always install the speakers 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).
• Stands or satellite systems must only be installed on a plane area with a maximum inclination angle of 5°.
• When using stands or satellite systems under the influence of horizontal forces, e.g. through wind, the
standing safety can be impaired. This is why additional safety measures like attaching ballast weights have
to be taken.
• If inclined tension cables or prolonged outriggers are used, the area of danger has to be marked or even be
blocked.
• Before lifting or lowering the telescopic tubes, you must always block a safety area around the stand or
satellite system. This safety area must have a diameter of 1.5 times the maximum height.
• Lifted telescopic tubes always have to be secured with a secondary securing!
• The total weight of the installation (=total weight of all individual parts) must never exceed the maximum
load of the installation area.
• The stand has to be installed out of the reach of people.
• An unintended movement of the load has to be avoided - also in case of fire!
• The installer is responsible for adhering to the carrying capacity given by the manufacturer, the safety
requirements and the qualification of possible co-workers.
• When people are located below the load, all necessary safety measures have to be taken in order to avoid
injury.
• The personnel have to be instructed on the content of the user manual and on the dangers related with
operating stands.
• Depending upon the individual installation spot, all necessary measures against movement and for
securing the standing safety have to be created.
• The installation is only allowed on carrying areas. In some cases, an appropriate substructure, e.g. via a
balancing foot, has to be created. When choosing the installation material, optimum dimensions have to be
chosen in order to secure maximum safety.
• Speaker systems installed on stands or satellite systems may cause severe injuries when crashing! If
installing on slippery surfaces, the legs must be secured with screws or nails via the provided holes or an
anti-slippery mat has to be used.

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.
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