Hi,
Just bought a sonos arc and paired with an old LG UH770V. Connected via the HDMI arc port and getting sound from the arc. However nothing I do gets anything better than Dolby 5.1. No films on netflix play in anything other than 5.1 (I have the premium subscription.) The Tv has no dolby atmos settings but does have a Dolby digital plus setting (or auto). On my laptop, Netflix offers spatial audio so must be something in my TV/soundbar set up preventing this.
Any ideas? Thanks