Sonos Arc and Samsung Q900 Dolby Atmos Support

Theoretically you should be fine. This set seems to support Dolby Digital Plus over ARC which, depending on your source, should allow it to pass Atmos to the Sonos Arc.

If you’re using built-in apps, you’ll probably be in luck based on what early users have been saying so far; if you’re using an Apple TV 4K or some other streaming box the answer is a giant who knows. Many of us are in this same boat (I’ve got a Vizio E-Series that I’m very curious to find out if it will be compatible)  

(The biggest difference between ARC and eARC is that eARC is part of the newest HDMI 2.1 spec, very few TVs support it, but it has enough bandwidth to pass uncompressed Dolby TrueHD / Dolby Atmos signals to devices that can support it like the Sonos Arc)

Good luck, and if you pull the trigger make sure to report back to us your results! 

Thanks!  My arc is scheduled to arrive on or after June 19th.  I’ll make sure to give an update based on my results from the built-in apps and using my Apple 4K TV.

So good news and bad; I’m in New Zealand, I got the arc today, and have the Samsung Q900R which I stupidly purchased for more money than I have ever spent on a tv on the promise of earc update being imminent several months ago. Dolby Atmos works with Netflix which appears to be the only Samsung app that supports it (I have tried Disney plus and amazon to no avail) but when I play games or uhd movies in my Xbox due to the lack of arc it will not play any Atmos. I expected this to be the case and will not be purchasing a Samsung tv ever again as for a 2019 8k flagship tv not to have this basic functionality is very very poor. 

So for me, Arc with Q900R, I have not had any success for Atmos. 

Apple TV 4K only gives me DD with Netflix, etc. 

All the native apps on the TV only give me DD+ and no Atmos. 

I had to play around a lot to get Netflix working, little trick, go to amazon prime video, play something, go to settings change the audio setting to Dolby digital plus, then go back into Netflix and then some shows had the Atmos logo. Disney doesn’t work and neither does amazon, nor my Xbox etc. basically the native Samsung apps are crap and we can’t get round this using an external device as there is no earc 

OMG. How stupid is that. But it did the trick, native Netflix App on the TV is now working with Atmos. Thanks - but yeah Disney+ and Prime nada

Better than nothing, I had hoped Apple TV 4K would work as that would solve some more problems with Disney plus and amazon, seems it’s only the LG panels that can decode the mat to dd plus from reports so far. Wish I’d got an LG tv, the Q900 has turned into an expensive nightmare, especially if rumours about it not supporting the future 8k streaming codec turn out to be true 

I got my arc yesterday and had similar results.

Dolby digital plus wouldn’t even allow me to select in the settings using native Samsung TV apps with exception of Disney Plus (Frozen 2 of all things)!  Even then, I didn’t get Atmos.. just DD+.

External streaming devices should be in DD+ and should not require eARC, ARC should do it.  If it’s not working, then your TV isn’t passing it through.

I said external devices and they do not use DD+ they use higher quality codecs such as Dolby true HD, DTS etc. external streaming devices such as Apple TV 4K also don’t all use DD+ they use Dolby MAT which the arc does not support, though some tvs can decode this for the arc eg LG