Will, if what you say is true, then why not implement a true symmetrical -24dB slope high-pass/low-pass electrical xover in the prepro. Doing it that way would provide a smoother match-up with a wider variety of mains and subs.

As you said the low frequency rolloff is all over the map for different types of main speakers, and this way would actually reduce the pollution of mains into the bass region much better than most current prepro's -12db electrical high-pass xover.

Another advantage is that a Linkwitz-Riley 4th order (-24dB slope) symmetrical xover actually SUMs to a zero signal level increase at the exact xover frequency as well as having a zero degeree phase offset. This is in contrast to other types of xovers with as much as a 2-3dB signal increase at the xover frequency and 90-270 degree phase offsets.

[This message has been edited by bstan (edited October 31, 2002).]