I'm about to buy a surround sound system, but didn't know if I need to buy one with an av receiver. My t.v. has enough inputs for all my components plus more. So I was wondering, if I just bought one of those systems with a dvd player, could I have a digital audio out from t.v. go to the dvd player and have everything working fine? My friend told me that it won't decode the signals into 5.1. I know the dvd sound should work fine, but having something like my 360 go through the t.v., then to the player, will 5.1 sound still work? Thanks in advance.