I have a 509 and recently ordered two additional speakers and an amp to expand my speaker setup from 5.1 to 7.1. In doing so, it looks like I have many more options in terms of listening modes. With the 5.1 speaker setup, I was letting the DVD or Blu-ray coding determine which mode (i.e. Dolby Digital, Dolby TrueHD, DTS, DTS-HD Master Audio). Since I don't have a cable box (just getting basic cable in the home theater), I was setting the listening mode to All Ch Stereo for cable TV viewing. Here's my questions:
1. Now that I'll have a 7.1 speaker setup, which of the following listening modes would be better suited in place of All Ch Stereo for cable TV viewing (given that I don't have a cable box and only basic cable):
Dolby Pro Logic IIx
2. Would the use of Dolby EX, DTS-ES Discrete, or DTS-ES Matrix enhance the listening experience over Dolby Digital, Dolby TrueHD, DTS, or DTS-HD Master Audio for DVDs and Blu-rays?
3. In essence, if Dolby Digital, Dolby TrueHD, DTS, or DTS-HD Master Audio either reproduce the sound in native 7.1 or convert the sound from 5.1 to 7.1 (depending on the source being DVD or Blu-ray and what the 509 can do with it), why would I ever want to use any of the other listening modes?
I apologize in advance if these seem like dumb questions, but with 5.1 (at least for watching DVDs or Blu-rays), I just let the 509 decide what to do based on the source. With 7.1 there may or may not be a whole new world of listening enhancements.