[sdiy] Ladder filters and gain drop, that old chestnut

Richie Burnett rburnett at richieburnett.co.uk
Sun Aug 30 00:09:24 CEST 2015

> I was referring to a comparison with an unfiltered signal, not a resonant 
> TB sound. :-) The passband is not flat with the resonance turned down, but 
> gets much flatter when resonance is turned up a tiny bit (but not to the 
> point where a resonant peak is starting to take form).

Yes, definitely agree with that.  That's negative feedback doing it's 
classic thing of flattening and widening the frequency response.  (Two of 
the main reasons why negative feedback is used in almost all modern 
amplifier designs!  The other major benefit is "linearisation" or reducing 


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