I was under the impression that PCM was a downconverted format. I just bought a whole new setup. Samsung 51' 3d tv, Pioneer elite receiver, and a new samsung 3d blu ray player. I set the audio output from the blu ray player to unencoded bitstream and when I played Avatar, my pioneer stated that it was playing HD DTS MasterAudio. It sounded awesome. Unfortunately the blu ray player was having problems and when I went back to best buy, the sales people there said samsung has all kinds of problems, get a sony or panasonic. I went with a sony bdp-s580. It doesn't have the option to set the output to unencoded bitstream, only auto or pcm. I set it to auto and my receiver says that it is coming in as PCM and it just doesn't sound as good. Not bad by any means, but definately not as intense or accurate to me. What is even more strange, when I hit the audio button on the blu ray remote, it says it is in HD DTS MasterAudio. Can anyone explain whats up? I know my receiver can handle the hd dts signal and my Hdmi cables are pretty high quality 1.4 standard so I know it isn't that. I am tempted to return the sony and try the panasonic, or just try another samsung but I am wary of issues? Please enlighten me.