Avoiding Feedback - TECshow BAM 10A UHF Manual De Usuario

Installation
Removing the Miexer and Accessories
When the PA system leaves the factory, the mixer and the ac-
cessories are installed in the speakers.
1. To remove the mixer, slide the button on the upper side in
the direction of the arrows.
2. The other speaker features a convenient storage com-
partment for the microphones, antennas, power cable and
speaker cables. Remove the compartment from the speaker
and disengage the latch on the rear to open the cover. Re-
move the items you need and close the cover again.
Installing and Orienting the PA System
The speakers can be placed as desired or put onto a PA speak-
er stand via the stand flange on the lower side. Always install
the PA system at a solid, plane, anti-slip, vibration-free, os-
cillation-free and fire-resistant location. Before installing the
system, make sure that the installation area can hold a mini-
mum point load of 5 times the system`s load (e.g. weight 20
kg – point load 100 kg).
When installig 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 system should
be installed in a way that they throw the sound over the au-
dience's heads.

Avoiding Feedback

One of the most frequent problems when operating speaker
systems is a feedback. It can be recognized by howling and
BAM 10A UHF
ENGLISH VERSION
growling loudspeakers. Feedback is created when a signal is
recorded by a microphone, amplified, played back by a loud-
speaker 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 di-
rectly in front of the speaker system!
Extreme levels like feedback, bass hum or the beats of a
dropping microphone can destroy the loudspeakers whithin
a very short time and produce immediate hearing damage.
Such extreme levels must be avoided at any rate. We recom-
mend using appropriate equalizers and compressor/limiters.
Stacking
This speaker system may only be installed on top of anoth-
er speaker system if both systems are lashed up with each
other via appropriate clamping belts and protected against
flipping over.
p. 8