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I did a little reading on the L7s; they're 4-way, meaning you'll be quad-amping each one if you go fully active. Just wanted you to be aware of that.

Here's a good primer on the subject: http://sound.westhost.com/bi-amp.htm

I haven't fooled with the L7, but you should realize that passive crossovers seldom obey textbook filter curves, and are...

Not exactly what you're asking, but you may find this thread interesting: http://www.audioheritage.org/vbulletin/showthread.php?36797-Biamping-with-2-x-identical-amps-breakthrough