28 Sep 15:57
Subtracting IIR filters has issues. Yes, the signal will reconstruct perfectly, but as soon as one band is processed things break spectacularly because of phasing issues.
Just change the gain on the central band and look at the spectrum of the reconstructed signal. It won’t be a step, it will have ripples. The more poles/steepness the worse it becomes, being 1 pole pretty usable.
In any case, by coincidence on MixMaxtrix 1.1 I added a crossover based on this, but just for creative purposes/des…
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