Originally Posted by LTD02
as far as fir vs iir for crossovers, is it audible under music conditions or only some controlled contrived scenarios?
Fair question - and I don't know the answer. I have heard that we can't really hear the phase relationships of different frequencies. I have also heard that the phase relationships between the harmonics of a musical instrument are what make it sound as it does. I don't know which is true - I just do the math.
i thought one reason why linkwtiz 4th order was used was that its 360 degree phase roll isn't actually audible, or do i have some piece of that misunderstood?
You understand that correctly. Personally, I think the Linkwitz–Riley filter is a piece of brilliance. It is actually a cascade of Butterworth IIR filters, whose total phase-delay goes full circle back to zero. Can't argue with that!
I know that the phase-delay of IIR filters is an issue in many fields, like communications, but I'm not sure how important it is with audio. I probably should have mentioned that my above post talks about FIR and IIR filters in general, and skirts the topic of its relevance to audio. My bad.