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DSP filters

I haven't had the opportunity to listen to a digital crossover, so I can't comment on how well they work. It would seem to me that symmetrical impulse response is highly desirable - no subwoofer lag - but who knows, maybe the ear just doesn't expect pre-ringing (it is rather unnatural to have ringing preceed the event!)

I believe gradual crossover slopes are much more desirable than steep slopes. Steep filters have ripples that extend well into the passband. This is the basic problem with CD. One day I made a CD-R with sine waves that were slowly swept in frequency (one octave per minute). The waveforms were computed mathematically by a program with proper dithering - as close to "perfect sound" as is possible. The only problem was the CD-R didn't sound perfect when played. There was audible beating or pulsating, particularly with sine waves in the 200-800Hz range. It was plainly audible on both CD players I tried. This puzzled me and I eventually realized the beating was due to amplitude ripples in the CD player's filters as the sine wave frequency was slowly swept past the ripples. Very disappointing. It convinced me that steep filters can do a lot of damage to signals well within the passband. I now listen a lot more to vinyl.
Regards,
Ed



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