I have been reading a little about this pre/pro and the specs state that it has six-channel direct inputs. When I look at a photo of the rear of the unit I see only a center, sub woofer, and l/r surrounds. What happened to the l/r main inputs. What am I missing here?. I don't want to purchase a pre/pro that doesn't have 5.1 inputs (sacd, dvda, etc..).