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In Reply to: Re: How best to integrate subwoofers in HT/Stereo setup posted by fitzjohn on February 19, 2003 at 00:00:50:
like this one from Hsu. It has a 2nd order high pass, and you could select 2 crossover freq. Make sure you don't get one of those high pass crossovers that has the infinitely adjustable crossover freq. They are implemented with a inferior sounding circuit design, or are implemented with a high precision and expensive multi-ganged pot.
Follow Ups:
Frankly, I think it's a pretty bad idea to try and match a 2nd order high-pass crossover filter to the 2nd order rolloff of you main speakers (if they are truly 2nd order rolloff which is mostly only true for acoustic suspension) and then try to match that mess with the internal low-pass crossover of the sub.For smoothly blending bass frequencies between mains and sub(s), I prefer something like a symmetrical Linkwitz-Riley (zero degree phase offset) crossover with a rather steep 24dB/octave slope.
This equalizes signal amplitude at the crossover frequency, and IMO makes it easier to pick a correct crossover frequency for a specific set of mains and sub(s).
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