I've searched the posts for a 1/2 hour and didn't find an answer on my own, so here goes. To get the quality level up sufficiently, I only want to select either Dolby AC3 or DTS. I'm just wondering if one is preferred over the other and why. Also, is there any reason I can't deselect one or the other? Any insight into what everyone does with the audio stream selections to save data space for quality would be much appreciated.