Unless you've got some specific goal you might want to reconsider bi-amping, unless you're going all the way and can use an active crossover. Even with this route, you'll have obstacles since you (to get best results) should bypass the built-in x-overs and this means becoming, in effect, a speaker designer.

A bigger amp wouldn't hurt probably, though.

Bi-amping without a x-over will reduce the broadband current load (effectively raising impedance) each amp sees, but the 755 seems capable of driving most reasonable loads without duress.

[This message has been edited by charlie (edited January 28, 2003).]