Anthony, there are two different ways to bi-amp speakers, actively or passively. The active method is what Scott is describing, where you insert an active crossover between the preamp and the amplifiers. In addition you remove the internal crossover of your speakers. This method offers the...
If your receiver has preouts for the front L and R to run to a separate amplifier, this would be the way to go. I would recommend not hooking up to the .1 (LFE) output, as the signal is mono and you would miss the normal bass that is fed though the main speakers. Just one final note, I would...