Over the last few weeks, I have bought an Arcam 8R/8P combination and a Rotel RMB1066 6 channel amp. I was bi-amping the fronts using the 8R/8P and then using the Rotel. When I connected my Denon 3802 to these in turn, both times, I have noticed a buzz in the speakers. The buzz is not very loud, but it is there. Anyone have any ideas as to what's going on? Why the buzz is there and how to minimise/eradicate it?