I have a Yamaha RX-V2500 on the way. It is 7.1 and my old receiver (also a Yamaha) is 6.1. I won't be getting an extra speaker any time soon and want to know the best way to hook the new receiver up for 6.1. Should I combine both rears with a splitter, use only one side or something else? I did look at the online manual for the RX-V2500, but it didn't help.