I tried watching Dunkirk UHD Blu ray this morning which has a DTS-HD MA soundtrack. I know the Arc cannot decode DTS and cannot currently receive 7.1 LPCM, but I thought the Xbox One X could encode Dolby digital on the fly? If I have my Xbox set to bitstream Dolby digital or Dolby Atmos I get no sound (Sonos app says it is receiving ‘silence’) from the arc if my C9 is set to pass through (eARC on). If I change the tv to PCM I get 2.0 stereo (presumably this is the tv downsampling the bitstream signal to LPCM). Given the recent C9 firmware upgrade, once Sonos have released their promised update enabling 7.1 LPCM I presume I can just set my Xbox to output to 7.1 uncompressed and away I go. However, anyone got any idea how I can get this working before then? UHDs and games with Dolby Atmos soundtracks work perfectly already btw.
Best answer by Turnwood2011
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