Re: Sony BDP-S350 & BDP-S550
I don't believe this player actually decodes DTS-HD Master Audio. Try it for yourself. You are supposed to set the BD Audio Setting to "Direct" when you want it to pass the track through bitstream to have it decoded at the receiver. This feature does work with the BDP-S550. However, you are supposed to set the BD Audio Setting to "Mix" when you want the player to decode the track, but when you do this, it passes through standard DTS (not Master Audio) to the player. The reason I know this is true is when you try to do this with Dolby TrueHD, you get Dolby TrueHD out on the other end regardless of whether the BD Audio Setting is set to "Direct" or "Mix".
My suspicions are further confirmed by the fact that their website doesn't actually say you can decode Master Audio (it says DTS-HD - not Master Audio) nor does the box mention Master Audio. I've also heard on other forums that Sony went back and forth on the specs on whether they were going to include native Master Audio decoding functionality - I guess they decided against it.