Symetrix 528 - Parametric Equalizer;Notch Filter

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esser controls are FREQUENCY, which is variable from 800Hz to 8kHz, and RANGE, which
may be set from 0dB to 20dB. In other words, the 528's de-easer will attenuate selected
frequencies between 800Hz and 8kHz as much as 20dB.
1.16 Parametric Equalizer/Notch Filter
The paramteric EQ/notch filter provides both creative and corrective frequency shapinR -
it can be used to create a more pleasinR sound, and to correct amplitude response
problems. It's desiRDed to provide an asymmetrical +l 5dB/-30dB boost/ cut response to
allow any of its three bands to perform as equalizers or hiRhly selective notch filters.
The term "parametric" simply refers to the fact that the operatinR parameters of the
equalizer may be altered. Those parameters that are user adjustable are (1) center
frequency (or fc• expressed in Hz), (2) bandwidth (sometimes called "Q," or selectivity,
expressed in octaves), and (3) the amount of cut or boost (expressed in dB).
1. Center Frequency is defined as the frequency (in Hz) at the middle of
the bell shaped response curve formed by a filter.
2. Bandwidth is the width of the bell shaped curve, measured between its
-3dB points. The measure of bandwidth in audio equalizers is usually
Riven in octaves or parts of an octave.
3. Cut or Boost is Riven in dB, at the center frequency.
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