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More About the Graphic Equalizers
Each slider is detented
so it "clicks" at the center ("flat")
point of its boost/cut range. These equalizers provide far.
more
flexibility than typical tone controls. Acoustic feed-
back can be reduced by lowering the slider which covers the
frequency
range
where
the
feedback
occurs,
Feedback
frequencies can be estimated by comparing them to notes on
a piano
or
other
instrument
('middle
С" is 256Hz,
one
octave above is approximately 512Hz, etc.).
Feedback
control
is actually a minor
application
for the
Graphic Equalizers. Judicious use of the Equalizers can help
the PA system sound more natural in troublesome acoustic
environments, and can add desired color, warmth or penetra-
tion even in good acoustic environments. For example, some
clubs
have
large
amounts
of
sound-absorbing
carpeting,
drapery,
furniture,
etc.
Since
absorptive
materials
affect
mostly the high-frequencies, the sound may be too mellow or
bassy. Other rooms with very hard walls and ceilings, or hard
surfaced dance floors, may sound too bright. Or perhaps the
speaker system
is deficient
in one frequency
band
yet is
peaky in another band. Adjusting the Graphic Equalizer .can
compensate partially for these problems in a way that would
be difficult to achieve with input channel EQ controls.
The Graphic Equalizers may also be used for many special
effects. As with any equalizer, greater amounts of boost or
cut cause greater phase shift. Therefore, use graphic equaliza-
tion sparingly; extreme settings should be reserved for solving
severe problems or for special effects. To keep distortion at a
minimum, avoid excessive boost at a single frequency. Since
removing feedback frequencies with the Graphic Equalizers
can also remove portions of desirable program material, you
should first attempt to solve feedback problems by careful
speaker and microphone placement.
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