So i am looking today at Fry's for 7.1 receivers and I noticed on 3 of them I looked at they had Rear Surround RCA jacks...My Oppo does not have those jacks so how would I be able to use the 7.1? Does the receiver just convert the signal internally for the rear speakers ? This is totally confusing to me...I think I need the rear speakers due to the size of my room but I don't want to have to buy a new DVD player as my Oppo is great...I am going out thru the 5.1 analog out puts