Just replaced my Bravia with a Roku 50" 4k TV and Audio setting 'passthrough' does not work as it did with my Bravia. Some DVDs (Blu Rays) will display a message in the Sonos app:
"Unsupported TV Audio"
And nothing is heard through the speakers. On the Bravia, this was overcome by choosing PASSTHROUGH, and then DTS/DOLBY were all working fine and automatically. My Sonos is S2 - it's new. Streaming sources work fine, but it's only the certain Blu Rays that seem to confuse the TV. It's a week old, considering returning if this cannot be resolved as it's a deal breaker.
In addition to Passthrough, I've tried all the other settings - CUSTOM, as well as AUTO, and the results are the same with these disks.
Thank you for anything you can provide.