For the most part, I agree with Mr Hardesty's approach. I use a passive high pass filter, but a 4th order, not first. 6db per octave is just too shallow and minimises the benefits pointed out about the lowering of mains speaker and mains amp distortion. The penalty, of course, is the group delay and phase anomalies pointed out by Mr Hardesty, but it is my experience, and I've read about it as well(sorry I don't have a source to quote), that at frequencies below 100hz the ear is just not as sensitive to these errors as it is in the critical mid-range. Its a compromise, as is almost any aspect of system building is. As for subwoofers, sealed is what I use and have never heard a ported design that didn't produce the artifacts that Hardesty points out. There are interesting reports though of servo controlled open baffle and Earl Geddes' multiple box(more than 3) approaches that are reported to be excellent, but I haven't heard them myself.
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