I recently purchased a Yamaha RX V1000 receiver and have a few questions about the 6.1 setup. First, I need an outboard amp to power the rear center. I have two available, An old Sansui integrated stero amp from the 1980's. and a basic Kenwood HT receiver. How do I hook up the cables? There is one preamp center out on the Yamaha, where should I send it to? Do I have to get a "Y" adapter and connect to both right and left sides of the aux input? How do i hook up the rear center to the preamp? The manual for the Yamaha is sketchy at best. Thanks in advance to any and all helpers.