Mobil-Katalog Deutsch - Medium

KNOW HOW ›MOBILE-SOUND‹ TECHNOLOGY
Correct installation of mobile systems
The correct assembly of the loudspeakers is most important
when installing a mobile-sound system. The speakers are
preferably positioned in such a way that the addressed
audience is in their main irradiating direction.
Please note the following principles for installation:
● Install your sound system in such a way that the
moderator talks towards the audience. The acoustic
location of the moderator is improved thereby.
● Square rooms, round rooms or rooms with a lot of glass
are generally problematic. Here, many reflections falsify
the sound characteristics and affect the understandability
of speech. You will probably have to experiment a
little from room to room in order to minimize the reflections
of the sound. Inside such rooms, it is recommended
to operate with the lowest possible volume in order to
avoid reflections. To achieve better results in these
rooms, use more highs and less lows.
EVENT WITH 1000 PEOPLE
● Some specific characteristics arise with outdoor events.
It is calculated that the audience at outdoor events
generates a sound pressure level of approximately
75 dB, with an upward tendency. For a sufficient
understandability of speech, the loudspeaker level has to
be ca. 10 dB higher. To be on the safe side, the possibility
of 95 dB should be provided.
BATH WITH 2500 PEOPLE
● On larger outdoor areas and low volume, good results
are achieved with decentralised public address, meaning
the application of more than one loudspeaker.
PANEL DISCUSSION WITH 2500 PEOPLE
● In wide or long rooms, it is often an advantage to use an
additional speaker. Place the additional speaker approximately
in the centre to your audience, and adjust it to the
same irradiative direction as your main speaker.
OPEN-AIR WITH 2500 PEOPLE
Stage
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● Central acoustic irradiations normally are the best possibility
to work without problems. They have the advantage
of easy installation and are free of disturbing echo, as
long as there are no reflective surfaces.
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A few words on feedback
If possible, always position your microphone behind the
loudspeakers. Feedback is a whistling, screaming and very
penetrative noise, which activates itself. If both a
microphone and a loudspeaker are located in the same
room, a self activation of the PA system by acoustic
feedback may occur. The condition for acoustic feedback is
a closed transmission circuit. The microphone picks up a
noise, which then is amplified and radiated by the loudspeaker.
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