Audio connections

See this link for the Sonos Home Theatre Audio Formats…

https://support.sonos.com/en-us/article/supported-home-theater-audio-formats

Have the connected TV, or player, pass-through, or transcode, them to one of the supported audio formats.

How can it detect something that’s not there? If whatever your watching or listening to does not produce what your looking for then it will not detect. I may be not completely understanding your question thoroughly though. When I want to listen to Atmos I have to look and see if what I am watching is producing Atmos. Perhaps I am not quite understanding your question correctly and if not, sorry. 

Already knew that; TY

My ? Is why doesn’t it support the other sources

i have lots of DVD/A, & SACD5.1 discs, & DTS /CD’s

the only way I can play them is through my Sony OLED 77” TV

Sounds good, but not like the Arc

I’m strictly referring the to DISCS; not TV audio

I hear you on the sound for sure. Nothing like listening to a song produced in Atmosphere or lossless. I would post this in one of the Sonos groups and see if there is someone there that can help. They do have some people in there that really know their stuff. Try that bud and find out . I don’t know if you have joined one of those groups, but I have found lots on there regarding my Sonos system. Give it a try and see. Sorry I could not help you but maybe your tv settings?  Heck them out and see and maybe download a new app as it could be the problem and I read that some guy had to download a new one twice to get his system going. Only trying to help here. 

I said I CAN PLAY Dolby/True/HD, & DTS VIDEO DISCS, not DTS/audio discs

Off the subject a bit but has anyone noticed an improvement with their sound after the last update? I really noticed my gen3 had a deeper sound and the dialog seems to be clearer coming from my soundbar.    Let’s just hope the rest of the updates improve our systems. 

Dunno then - maybe see what Sonos Support say. I’d perhaps reproduce the issue and and then immediately submit a Sonos system diagnostic report from within the Sonos App, note it’s reference and then contact/chat with Sonos Support Staff via this LINK and see what the Staff can perhaps suggest to help you to resolve the matter. They can perhaps see what the audio format is that the Arc is receiving and then maybe go from there.