Parametric SubWoofer Equaliser

Posted on Jul 24, 2012

In essence, it uses the same principle as a graphic equaliser, but the simulated inductors are made variable, so the frequency can be swept back and forth. The four 10K pots provide cut (when on the left or anti-clockwise side of centre) or boost, and in the centre position have no effect at all. Maximum boost and cut is about 12 to 14dB (typical).

Parametric SubWoofer Equaliser
Click here to download the full size of the above Circuit.

The low frequency section can be swept from 35Hz to 150Hz in peaking mode (this is the normal form of operation for a parametric equaliser), but also offers the option of shelving. Shelving is similar to the operation of conventional tone controls, but th

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