I'm trying to process an audio stream through a series of peak filters at static frequencies that range from 0 to nyquist. If I start the range from anything below about 25Hz, the audio gets corrupted in some way (I haven't looked at the values yet, so I don't know what the corruption looks like) that results in no sound. But making the range ~25Hz to nyquist is fine. This happens even when all the filters are at zero gain.
Is anyone aware of theoretical problems with using a low frequency peak filter? Maybe it's a problem when its bandwidth might cross over 0Hz? (Do standard biquad equations address that possibility?)