For me this just worked out of the box for the Netflix and Prime Video apps and with a few audio settings changes for Plex and Kodi. The new Shield TV Pro 2019 has new audio settings that the old model didn't and it is handling the conversion of pretty much any surround sound format into whatever audio formats the connected device can support, which for the Playbar is just AC3 (Dolby Digital). My hardware setup: Nvidia Shield TV Pro 2019 : HDMI Out -> HDMI In : Samsung TV UA65F9000AKXXS : Optical Audio Out -> Optical Audio in : Sonos Playbar This is confirmed both by my ears but also via the Sonos mobile app > System > About My System > Playbar TV > 'Audio In: Dolby Digital 5.1' Last week I picked up the new Nvidia Shield TV Pro 2019 and I'm happy to report that the Sonos is now seeing DD 5.1 from all of the sources I mentioned above. From the number of posts on the Sonos and Nvidia user forums I'm clearly not alone. I'm a long suffering Sonos Playbar owner who has wasted a lot of time and money trying to get 5.1 surround sound working from my Nvidia Shield TV 2015 edition.

Plex nvidia shield pro