I have a 7.1 Denon 2803 receiver that is wired for 7.1 speakers. I'm in the process of buying a 6 channel SACD/DVDA cable to play DTS. My question, now that I'm not using my receiver to encode or fake 7.1 with the optical input source from my 5.1 DVD player, how do I wire the analog cable such that I use all of my speakers? Meaning if I use the 6 channel direct analog lines from my DVD player, I won't have anything to feed to the surround center speakers (which defeats having 7.1). If I'm wiring direct analog lines from a 5.1 to 7.1 setup, do I have to use Y-connectors to split the rear/surround left and right among my two surround center speakers? I'm assuming the surround L and R get repeated/split among the rear center speakers via my optical feed today but I could be wrong. Thoughts?