threers:

I assume you’ve read page 2 of this thread.
http://ubb.outlawaudio.com/ubb/Forum14/HTML/000110.html

Unfortunately I don’t have active bi-amp system but there’s a remote possibility I may in the future. So far, I gather that active crossover is better than passive one when calibrated properly. That can also mean no crossover is better than any crossover especially when there’s no need for calibration. I’ve heard about such speakers. Lowther and Fostex (plus a few others) both make full range drivers. I don’t think they are truly full range since they start to roll off quickly below 40 Hz but going up to 20 KHz at relatively flat response is pretty amazing. Except for a few types of music, this kind of driver may be a possible alternative to active bi-amp configuration.