Equalization Adjustment - PROEL AXIOM - VERSION 2.0 Manual

6. Operating guide
of the sound reinforcement system: the system is not adapted to the sound pressure levels required by
the situation.

6.5.2 Equalization adjustment

The changes in atmospheric and environmental conditions between the set up of the system and the
actual performance can be quite noticeable.
In closed venues, the arrival of the audience drastically augments the acoustic absorption charac-
teristics of the room, with consequential changes in the reverberation decay time. At open air events,
instead, the changes in temperature and humidity combined with the need to project the sound very
long distances can have dramatic effects on the highest-frequency range. Very often shelving filters are
used to compensate this at the source and retain the sound pressure lost to attenuation and therefore
equalize the response of the system for a certain distance. Obviously there are limits to the additional
gain which can be applied to the HIGH pass band that cannot be exceeded without the introduction of
distortion or even the destruction of the high frequency transducers.
In open-air situations other factors can intervene, such as wind and thermal profiles which can create
phenomena of focalization, acoustic shadowing and other general destabilization of the sound field.
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6.5. DURING THE SHOW