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The centre frequencies of the graphic equaliser are chosen for
perfect filter interpolation. For some frequencies this means a
slight deviation from the ISO proposed centre frequencies. The
maximum deviation is about 2% so there should be no problem
when using the equaliser in combination with commercial real time
analysers that, generally, use the ISO centre frequencies.
The 30 controls of the graphic section provide you with a lot of
possibilities for shaping sound. In doing so, it is best to regard
following principles :
• It is generally better to attenuate peaks, rather than to boost the
surrounding frequencies to the same level.
Noise will be lower and the sound will be more natural in this
way.
• Do not attempt to correct narrow peaks or dips with the graphic
section. Use the parametric filters for this purpose. These
aredesigned for narrowband operation and are much more
versatile .
• Do not use the graphic equaliser as a gain fix-up device. It is far
better to use the 6dB of available gain from the LEVEL control
than to put a lot of equaliser controls in the boost position.
that even at lower Q these non reciprocal filters remain essentially
inaudible.
In the overlapping regions, between two filter sections, you can
adjust two adjacent sections to the same frequency. Because of
the perfect combining response of the filters, responses are added.
This is another way for building a deep, less sensitive notch. You
can adjust two -15dB filters to get a 30dB notch and because of
Graphic equaliser
