There's piles of comments about diddling with the passive xovers in the heritage series. I can't help but wonder if a better answer wouldn't be to just disconnect 'em all and go right to multi-amping things. When I was doing pro-audio, this was a given for most applications, so I've never quite gotten why it hasn't flown here.
My current setup has a pair of cornwall fronts, a pair of heresy surrounds, and a 15" reflex subwoofer of my own driven by a DC300
connected to through a 3 channel/2way + subout film theater electronic crossover. You would think another crown for the low end + a tube amp for the horns would be sweet.
curiously,
-dB