I am changing my speakers which require more power to be all they can be. They will need to be bi-amplified. On my Sony STR-DA3ES receiver does the second room (or B) speakers split the front "A" channel in stereo mode? Or does this use say the rear speaker channels to drive them? The reason I ask is, if I were to run the "B" speaker outputs to the second set of inputs on my front speakers, will it just split the same channel between A and B 50/50 and thus not benefit me at all to connect the B spkr wires? Or does the A speaker outs still have the full 100 watts and the B speaker another 100 watts thus enabling me to bi-amp the fronts in stereo mode? Second, I am getting a new center as well and found out it is a 6 ohm speaker while the fronts and rear will still be 8 ohm. The manual says that it if any of the speakers are less than 8 ohms, the receiver should be set to 4 ohms. Is that correct? That doesn't seem quite right to me. Should I still keep it set at 8 ohms even if the center ch spkr is rated at 6 ohms?