I just purchased a Yamaha RX-V2500 receiver and will use it with Definitive tech. BP2004 & CLR3000 center. Any advise on how to setup the subwoofers? I am upgradeing from the Yamaha RX 795a, and was never quite satisfied with the settings. Also anyone out there have any input on 7.1 setups? My room is 20' wide by 17' deep with 9' ceiling. Thanks for the info.