bi-amping question

if I have a 5-channel amp (Krell TAS 200x5) and want to bi-amp my speakers (B&W N802) how would I go about doing that? Would the sonic gains be worth it for 2-channel? then I can simply add another 200x2 amp for the rears correct?
also, how would I handle the connection from processor to amp? currently using xlr's.
One of the downsides to bi-amping with a multichannel amp is that if the four channels you are going to use for bi-amping share the same power gain from reduced load as you would get from seperate amps.

If you add a two channel amp to the mix that matches the Tas's specs you may be very happy with the new setup. I would put the two channel Krell on the bass section of the 802's.