I've noticed something strange surround wise about my Yamaha RX-V671....or more than likely it's just me (nothing new for me to read something the wrong way). Bought this AVR last spring (it's a 7.1 I should add) and it's performed flawlessly. Until a month ago, I was only running 5.1 with 2 rears, no sides. I bought the immersion copy of Wish You Were Here and noticed a bunch of instruments MIA on the blu-ray pcm. No background 12 string on the WYWH track opening, missing effects from Welcome To The Machine. Hmmm. Ran the audio check on the speakers from the AVR, no problems. Tried the blu-ray on my son's equipment, it's fine. About a month ago, I finally bought 2 side surrounds. Put the WYWH blu-ray back in, everything I was missing is there...on the side surrounds. Today I got my first 2 SACDs to go with the new Oppo 103, Brothers In Arms and Tommy. Both awesome btw, thanks to the folks on here for their recommendations. The 5.1 they're playing in utilizes the side surrounds as well, no rear action. Am I just nuts or is this the way it should be? I have no issue with it at all, sounds great but I thought these discs would use the rears, not the sides at 5.1. I did check my hook up on the AVR btw, and did another sound check after turning it into 7.1. and the speakers are all in the locations they should be. Thoughts (about this issue, or my sanity, your choice)?