I've finally completed my vision of running bi-amped. I made a homebrew 2x6 cab using an Avatar B115, Eminence Alpha6, and an Eden 6 that I picked up on the bay. WOW! This rig has amazing clarity (see sig). I was a little concerned that using a 4th order Linkowitz-Riley crossover would detach the drivers too much but that is not the case at all. I like the idea of the steep slope for protection of the 6 inch drivers, and I'm not at all afraid to try different crossover points as a result. Right now 500hz sounds best to me. Anyway, for those of you considering biamping I believe it is key to use drivers that are not intended to overlap frequencies but specialize in there own. Thanks for allowing me to gush a little!