I have a Denon AVR-1906 7.1 receiver and I have hooked up my rear speakers to the terminals labeled "Surround" L and R on the back of it. My question is that there are also terminals for a "Surround Back" L and R as well. Do I have my speakers hooked up to the right terminals (or should I hook them up to the "Surround Back" terminals)? My couch is against the wall so I have my rear speakers on stands on each side of the couch (I also have 2 fronts, a center and a sub). If I hook them to the "Surrounnd Back" will there be a difference in the sound? Thanks!