Originally Posted by BrentSP
So wouldn't you use the auto setting so that it can flip back and forth from MIX and DIRECT depending on the disc?
So here is where things get confusing.
The "Auto" and "Mix"/"Direct" are actually two different settings in the 550.
The "Auto" setting is located in the option for "HDMI Audio" you have two choices "2ch PCM" or "Auto"
The "Mix"/"Direct" option is located in the option for "BD Audio". This setting is apparently supposed to "selects whether to mix or not to mix interactive audio and secondary audio (commentary) when playing a BD that contains such audio" (pg 49) So I'm assuming that this mixes the commentary from BonusView content in with the normal audio.
It says "direct" "outputs the primary audio only".
The chart on pg 66 seems to indicate that the normal default behavior when dealing with BD is to output multichannel LPCM for every format. It specifically states Dolby TrueHD is output LPCM 7.1, DTS-HD MA is output LPCM 7.1. However all the DD and DTS format for BD in this column have a sneaky little a footnote number *5.
"When "BD Audio Setting" is set to "direct" audio recorded by the source is output by bitstream. However, this audio maybe output as follows depending on the audio formats supported by the AV amplifier (receiver).
- When the AV amplifier (receiver) does not support HD Audio (Dolby Digital Plus, Dolby TrueHD, DTS-HD High Resolution Audio and DTS-HD Master Audio) but supports Multi-ch LPCM, up to LPCM 7.1ch is output.
-When the AV amplifier (receiver) does not support HD audio or Multi-ch LPCM but supports Dolby Digital/DTS, a Dolby Digital or DTS bitstream is output.
-When the AV amplifier (receiver) does not support HD Audio, Multi-ch LPCM or Dolby Digital/DTS, LPCM 2ch is output"
So in my case my Sony STR-5300es supports all these formats. So it according to the chart it normally be outputting everything as multi-channel LPCM...including DTS-HD MA. When the "direct" option is set it should be bitstreaming the format to the receiver (which in my case it is doing).
But I think it is not handling DTS-HD MA properly. I believe when set to the normal "mix" option it is only decoding the core 5.1 and outputting 5.1 LPCM hence the reason when playing Golden Compass the 550's OSD said DTS 3/2.1 when the option was set to "mix" and then "DTS-HD Master audio 3/4.1" when set to direct.