Thanks zombie for that post, but with my new receiver(granted it is still very new, I have NOT learned all with it yet) I have it set to straight, that gives me straight audio from the BD, receiver is not changing it in anyway, it just plays it the way it is directly on the BD, so I get beautiful DTS-HD MA 5.1 or Dolby TrueHD 5.1

When I go to my Star Wars BD(the Blu-ray Set I am currently working on) and switch to that 1 channel mono it plays out my center speaker alone, I am pretty sure no front left and right towers, I will check, but when I play a movie that has DD 2.0 mono, it plays out both front left and right towers and maybe the center as well, again, I will have to check, but I lose all my surround and subwoofer, and to me these are very important for great sound.

When I watch movies, I want to feel the rumble of the ships when they go by, I want to hear when an explosion happens behind me, and only behind me, I want to hear that ship go racing by on the left of the screen and hear it out of only that surround speaker and no other, mono audio does not do all that, and if you say it does, than I guess I need to do some research.