Dear Sonos users.

i have a new arc and sub plus 2 era 300 speakers and have set as a surround sound system. It sounds great and

have tested a few blu rays and works great. The question

i have or I have noticed,

when I play the gladiator film On Netflix the sound comes up with Dolby digital plus 5.1 but when  I  play the same film as a 4k blu ray it comes up with PCM 5.1 and the surround feature doesn’t seem to come through the rear era300.

can anyone explain why??, and is their a way or any setting I can do to help