does anyone know approximately what boston crosses their z's over at? playing around with the crossovers i noticed that even dropping the tweet from 1.3k to 1k you can easily hear that it picks up more range... which seems pretty low for a tweet xover frequency to me, but perhaps that has something to do with their nifty AMD stuff... and of course they certainly don't want anyone messing with their stuff and will not release any info whatsoever to someone trying to go active with it because they don't want you to ditch their xover network. was considering going active with it, but i don't want to go out and destroy a $300 set of speakers 'experimenting' to see if i can improve anything, or should i just let it be. they are currently bi-amped through the z passive xovers. i really have no knowledge about how crossovers are built and what parts to what (i know the very basics, but that's about it) is there anyway to tell mathmatically what they're crossed over at by adding up values on inductors and capacitors? or does the signal go through different capacitors say when you change the switch from -2db to 0db, etc or sq1 to sq2. any ideas would be appreciated.