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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

8th-order subsonic filter
8th-order subsonic filter
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Old 4th November 2017, 03:10 AM   #11
PRR is offline PRR  United States
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I'm still wondering how ANY audio system, and especially a playback system (getting mastered recordings) could ever need 8th-order bass filtering.

2nd and 3rd order cover the case of too-small sealed and vented woofers getting bass-heavy sources. Another 2nd order might be needed on badly isolated phonograph. There are mis-designed phono preamps with subsonic bumps which *might* want another slope. So worst-case I figure 5th or 6th order. And that's a troubled system. 4th order sound more than enough for any non-sick system; 3rd for too-small woofers.
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Old 5th November 2017, 07:57 PM   #12
alex5612 is offline alex5612  Austria
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Originally Posted by Fast Eddie D View Post
Phase shift can cause audible anomalies. That's why we sweat the crossover so much - nonlinear phase shift between two drivers can cause some very audible effects; including cancellation at certain frequencies, and a (subjective) "garbling" of the reproduced signal.

Crossovers make or break a system. A good crossover can make two drivers play well together.
You do have a point there. The filter was supposed to go into a subwoofer controller/preamplifier. It does work just fine on its own, but when one tries to simulate the whole system the response is plain awful. Including poor response at the crossover region and many, many notches all over the audio band.

I'll guess this will be addressed in a different way. Maybe I'll post something later on when the project has progressed.
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