Hi All, I hope someone here can help me out with this so here goes: I have Klipsch RF3II speakers that are bi-wireable/bi-ampable. I also have an Onkyo 797 receiver with an external Parasound 5 channel amp. This is what i would like to do: I want to use 4 channels of the Parasound to bi-amp my main speakers. I would then use the remaining channel to run the second rear center(Onkyo has the pre-out for the second rear center but only one of the rear centers is powered.) My question is this: Do i need an external crossover to bi-amp my mains? If so, will the Outlaw ICBM work for this? I believe the main speakers have a 1975hz internal crossover if that helps. An help/suggestions would be greatly appreciated.