I'm considering a Denon 4802, a 7 channel receiver, but I have a standard 5.1 channel speaker setup and don't plan to add any additional speakers. Front speakers are a pair of NHT VT2.4, and I have read they can be bi-amped with great success. Here's my question: can the 2 extra channels on the Denon 4802 be used to bi-amp the NHT VT 2.4 speakers? Or, alternatively, can the other room mode on the Denon be used to bi-amp the speakers? Or, alternatively, is there any other way I can use the 2 extra amp channels in the Denon 4802? Thanks.