Arc Ultra/sub4/ERA300 not playing dolby atmos

Same for me. Just set up Ultra, no Dolby Atmos in any movie. Inexcusable, especially with all of their recent problems. This launch had to be perfect. Going to try suggestions here and if it doesn’t work tonight, it’s going back tomorrow. 

This thread is about streaming Dolby Atmos music with Apple Music, not movies.

You would be better to start a new thread explaining your tv setup and movie source.

 I don’t have an Arc Ultra, but I do have the system Arc-Sub3-300s.  Lately when I start one of my Apple Music Atmos playlists something weird happens.  I’ll start the Atmos playlist at which point the stream for the first track is reported as Lossless.  At that point I open the queue, scroll down a bit and choose another track.  Now the stream is reported as Dolby Atmos.  Next I scroll back up to the first track that was reported as Lossless.  Starting that first track again now reports it as Dolby Atmos.

 Makes me wonder if the same thing would happen with a movie.  Maybe the stream is Dolby Atmos, but not showing as such.  Movies are not a series of tracks so that incorrect format report might stick for the entire movie.

 Have not tried the Apple Music Atmos playlist test, as described above, since the last app & firmware updates.  Will try tomorrow.  Tonight is Thursday Night Football.

@MoPac 

Good idea… but I saw that behavior only on Apple Music. Not on Amazon Music and never on a movie delivering Atmos sound via hdmi eARC. 

I’m sorry, I thought it was about Dolby Atmos not working on the new Arc Ultra. Does it matter what the source is? Obviously the problem is the Arc Ultra and it’s ability to decode Dolby Atmos properly.

As, apparently, many people are discovering, they just purchased a $1000 Dolby Atmos sound bar that doesn’t do Dolby Atmos.

Music streaming is different to tv audio, although the thread title is ambiguous.

Of course it matters what the source is and how your equipment is connected together, but you provide no details for any troubleshooting.

Three things you need to check before definitively stating “Obviously the problem is the Arc Ultra and it’s ability to decode Dolby Atmos properly.”

1. Are you sure you are using a Dolby Atmos source?  Note: YouTube sources, even when marked as Atmos or DD are almost always downgraded to stereo PCM when posted.
2. Are your TV and/or streaming devices you use Atmos capable?
3. Are your TV and/or streaming device set to correctly pass Atmos?

You see, it’s not as simple to just blame the soundbar, especially when the vast majority of users have been able to get Atmos.  So why don’t we dial it back a few and get a detailed description of what your system is like before making a blanket indictment. 

Yes, yes, and yes. I moved from an Arc to an Arc Ultra and the Arc worked flawlessly for four years.

LG C2

ATV 4K 2022

Arc Ultra

Sub 3
Era 100’s

I realize that my original post was lacking detailed information. It was meant as “I am having this problem too”. I am not looking for help or solutions, I am just very frustrated with Sonos in general. Given the year they’ve just had, I expected the Arc Ultra to be fully vetted before being introduced. Apparently that’s not the case. And not just because of the problems I am having, several people are reporting similar issues (the purpose of this thread). I did try the suggestions posted here, as well as many others that I have researched and found from people having the same problem. I am not a novice or noob, as some people like to assume (given the tone around here), just because I am having a problem. I can fairly assume that I have a defective product at this point. I will try their support line before returning, but being a first run of a brand new product, it happens.

Then I leave you to your assumptions.  Good luck.

 If you’re familiar with how Atmos sounds with a favorite track can you play it and definitively say that’s not Atmos?  I’m wondering if the flaw is the reporting of the codec.  Does it show any codec like maybe Lossless or something else?