How are you bi-amping? If you're connecting two sets of wires to two different outputs on the same receiver or same amp, then it's completely useless.
I have a Denon 3808ci. The Zone 2 terminals on this amp are configurable to be Zone 2, Rear Surrounds, or Bi-Amping. You connect a set of wires from the Zone 2 terminals, to the second set of terminals on the speakers, then you configure them as Bi-Amp. According to where I bought it, and to Denon it is supposed to help make them sound a little smother/fuller. Now just adding a second set of wires is Bi-wiring, and that is of course a completely different thing. But the way I have it is supposed to make a difference. Night and day, no, but I feel better about it.
