Sonos Arc soundbar DTS to AC3 Transcoding not working

@georgejolliffe Thanks for your reply.
But I can’t find any options to disable DTS in Plex Player settings on Shield TV. What I can get is to change the web player settings in the Shield TV IP’s Plex Media Server web console.

Home theater topology:
Sony TV
|-- HDMI – nVIDIA Shield TV
|-- HDMI – SONOS Beam


Update: I have already solved the transcoding issue of SONOS Beam.
That was really simple:

  1. open Shield TV
  2. open Plex
  3. setting – advanced – channel, just choose to disable it, neither HDMI nor Optical
  4. It would transcode DTS to AC3

Hope this could help someone who faced the same issue about SONOS Beam.