Arc Ultra/sub4/ERA300 not playing dolby atmos

@Scalptrash

This thread in detail was reporting about missing atmos from Apple Music. And as you can read above that was resolved for the users who reported about it before. If I haven’t missed something you were the only one talking about movies as source. 
And exactly there, using the eARC source with input from tv and /or other external devices, the reason for missing atmos often are incorrect settings. 
So I suggest you use any atmos audio file via Sonos music library, Amazon Music or Apple Music to check, if atmos on Arc Ultra is working at all. 

Message received! I was done, but people still feel it necessary to correct me. So this thread posted in Home Theater is only about Dolby Atmos in music, not about Dolby Atmos not working properly on the new Arc Ultra. Got it.

@Scalptrash 

I think, most (I also assume all) users over here don’t like to „correct“ you as their first intention, but try to „help“. 
That sometimes results in misunderstanding each other, if someone as you said just comes to get rid of some frustration. 😉

I see why you have so many replies. You must be a hoot at Mensa parties!

No problem… I also can just leave you alone. I‘m sorry for trying to help. 

There is definitely a problem with Arc ultra. I have mine paired with sub 4 and era 300 in one room and another arc ultra with sub 4 and Sonos one SL. When playing music from Sonos app, the sound plays erratically across different channels. The center channel does not seem to be playing on the arc and the surrounds suddenly shoot up in Sound. Never had this problem with arc. When I airplay, does not detect atmos at all. Called Sonos support and their solution was to install a mesh router. How stupid. $3500 down the drain and on top sold my arc and sub 3 dirt cheap to upgrade. 
 

Hope Sonos fixes this problem. I am really upset that they did not do basic testing before launching. 

 

@Sri662 

First time i‘m reading about such music mode channel issues. What source and content did you play? Was ist stereo or atmos content?

Btw… Atmos via Airplay in not possible on Sonos devices because of Apples AirPlay restrictions. 

New Arc Ultra, sub4 and (2) ERA300s.

Playing music from Sonos app, I was expecting all devices to be playing and it appears only the Arc has output.

ERA300s and Sub4 is paired with the Arc ultra and i was hoping This would just work out of the box.

Prior to the Arc4 showing up, I had the ERAs blasting away without the sub and they sounded awesome.

This seems to be taking too much time for a $4000 investment.

​@Lasoff 

Are the Eras bonded as rearspeakers with Arc Ultra? If so, please make sure that surround speaker settings are set to „full“ for music mode instead to „ambient“. Then stereo music should sound on the Eras like on a separate stereo pair. 
If you play Atmos Music sources, the Eras will ignore the settings mentioned above and always play the effect channels signals. The result strongly depends on the audio mix quality.