@AllStar @Marino.Manolo @LightFoot
As I expect Marino well knows, either or both of using Optical Out instead of HDMI eARC Out, and using PCM instead of Bitstream will severely compromise what the Sonos can achieve, soundwise, with the resulting signal.
But don’t take my word for it. Instead, get your best-sounding BluRay disc, with a DTS-X or Dolby Digital soundtrack, and, forgetting the TV speakers for the moment, play it on Bitstream out of the ARC HDMI into the Sonos, and then play it on PCM out of the Optical into the Sonos, with the TV speakers turned off, and compare the audio quality in each case, with particular reference to the audio soundstage produced.
Then play the disc out of the TV speakers alone, Bitstream and PCM in turn, and again note the audio soundstage produced.
Finally, use the TV speakers, plus the Sonos via PCM over Optical.
See which of these 5 options you prefer the sound of. And, perhaps as importantly, see which of these options are straightforward to manage, and which have you balancing separate volume controls, and having to manage explicitly switching to and from.
My favourite bedtime reading is a Sony product manual…
