Various low cut, high cut, mid reduce or mid boost etc can be implemented as follows. There are useful for restoring psychoacoustic presence due to Fletcher Munson and voice effort curves.
Everything is connected in parallel to signal ie on pin 2 and 3 of mic output.
Multi tap inductor or various switched inductors in series with a variable resistor and the whole lot in parallel, for high pass.
Same but with switched capacitors for low pass. This is parallel with 2 and 3 too.
Switched capacitors in series with switched or multi tap inductors in series with a variable potentiometer resistor. The resultant in parallel again. This is for reducing a certain band of frequencies and making a mic with a peak to become flat.
Switched capacitors in parallel with switched or multi tap inductor, a series variable resistor and the resultant in parallel with signal. This can be useful for increasing a middle band of frequencies to restore psychoacoustic presence.
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