I'm working on a rather complex passive crossover circuit for a pair of speakers. It has grown so much that, while I have equalized spl to within +-1/2 of a db, there are phase errors between simultaneously playing drivers up to 77 degrees according to my SPICE simulation. This would be extremely problematic: not only would destructive interference create dead zones for certain tones in certain parts of the room (**edit**I guess this would happen even if the drivers were perfectly in phase, since you'd have two waves emanating from different points in space, but I assume, although, I haven't done the math that there would be some phase difference at which the error would be minimum. That angle might not even be 0 if the drivers were displaced on the axis that the sound was radiating on (these speakers are highly directional). My instinct is that this phase angle would be low, however, assuming the wavelength to be short, and besides my drivers are not so displaced.**edit**), I'm told phase errors this large are audible too.
I wanted to insert some sort of phase delay circuit, preferably passive, to prevent this from happening. I've been gravitating towards the bridged t delay equalizer since it appears to be most simple, but the circuit I designed with this topology both has an incorrect phase correction AND seems to have a resonance frequency close to the band I'm correcting to boot (although not at it, so I don't think I did something as stupid as inputting the correction frequency as the maximum usable frequency).
Can anyone explain or tell where I can download a text explaining how to design one of these things?
I wanted to insert some sort of phase delay circuit, preferably passive, to prevent this from happening. I've been gravitating towards the bridged t delay equalizer since it appears to be most simple, but the circuit I designed with this topology both has an incorrect phase correction AND seems to have a resonance frequency close to the band I'm correcting to boot (although not at it, so I don't think I did something as stupid as inputting the correction frequency as the maximum usable frequency).
Can anyone explain or tell where I can download a text explaining how to design one of these things?
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