I have this setup:
Apple TV - HDMI - Samsung UE65NU7172 - HDMI (ARC) - Sonos Arc+2xPlay:1
In the TV I see that Bitstream is chosend and als Dolby Digital. The TV should support also Dolby Digital Plus, however, it is grayed out all the time.
As far as I know, all devices I have connected should support Dolby Digital Plus. How can I activate it or how can I test it? Any idea?
I have exactly the same issue with the same setup but my Samsung model is UE65MU7000. Cannot get Atmos or DD+ working on AppleTV, Blu-ray (using Ps3). The ARC wont work on any other HDMI input