I, personally,think the main reason for not hearing a difference between DD/DTS, and the HD audio formats, is the speakers you have. Your speakers must be able to distinguish the subtle differences of the formats. Unless you have golden ears, you're not going to hear a difference with HTIB speakers, and probably won't even then. Even if they're not HTIB speakers, speakers that are real cheap won't let you hear the differences either. I always try to talk people out of buying real cheap speakers, for this very reason...........