I've go an lg b9 and when I play something that is Atmos it shows on the tv as playing Dolby vision and then in the sonos app it shows dd+ I don't think that is Dolby Atmos is it?. If I unplug the arc and play the same Netflix prog through the tv speakers it says Dolby vision and underneath Dolby atmos

What device are you play content from?

The tv 

If it’s playing Atmos content it should show in the Sonos app that it’s playing Dolby Atmos (DD+) or (Dolby Atmos (TrueHD). What are your audio settings on your B9?

ok so i have 

sound out hdmi arc. when i click  into hdmi arc the settings are

Digital sound out is auto (have tried setting it to passthrough and no different)  

eARC is set to on

when i go into netfrix options it has English (original) ( atmos) ticked.

When i look at the sonos ap it says arc is playing dolby digital plus 5.1

is it simply a labelling thing? nothing actually says ATMOS

What is it you’re watching on Netflix so I can test it out on my set?

This is exactly the same set of gear that I have (except still deciding on the Arc, and a Nintendo Switch). Been chasing lip sync problems for a while with my current soundbar, a Yamaha YSP-2700. 

So a few questions:

1. Are you using a HDMI switch on one of the C9 inputs? And if so, is it introducing any problems with eARC to the Arc?
2. How bad is the overlap with the insanely low C9 stand?
3. How does it sound?
4. Ugh, that Plex issue….

(edit - actually I suspect that the Shield/Plex problem might go away when Arc adds multi-LPCM. I also wonder if the AppleTV Disney+ problem just requires a force close of the app, or an AppleTV reboot).

This is very strange as I have the C9 and Apple TV 4K and in Disney I get 5.1 no issue and on prime i am only get 2.0 stereo?! So it seems I am getting something different to you even with the exact same set up?

Thanks Zophop - I also have a C9 and unfortunately Arc has been held up in delivery so won’t come until tomorrow. Couple of questions:

1. If you stream content through the inbuilt Apple TV app, is it coming through as Atmos or DD 5.1?
2. Do you have a Sky Q box hooked Up to the Tv and if so, any lip sync type issues?
3. Odd the Disney + app isn’t coming through as Atmos, will hopefully sort itself out 

Sounds like it’s pretty much play and play for the C9 which is good!

6 underground..just as a test

Here is what it shows in netflix

1. I’m not using an HDMI switch at the moment, but I’ll definitely be picking one up soon so I don’t have to keep swapping cables. If you’ve got a recommendation for a switch I don’t mind picking one up and testing it.
2. Can’t comment sadly, I’ve got my C9 on the wall precisely to avoid this but I imagine it overlaps by at least an inch.
3. It’s definitely an upgrade over my Playbar, I’ve not had a chance to watch a full movie on it yet as I’ve been testing various configurations but what I have watched of Blade Runner 2049 has been wonderful.
4. The Plex issue is disappointing, but luckily it’s not the end of the world. It actually outputs DTS to the Arc however the Sonos app warns that it doesn’t support DTS and plays no audio. I did try rebooting the Apple TV and force closing the Disney+ app but still had the same problem. I imagine the problems due to a combination of the throttling in the EU and the lack of LPCM support on the Arc, when that releases it should in theory work perfectly with the Apple TV.

What’s your audio settings on the Apple TV set to? That’s really odd!

They are set to change audio NO and Atmos on! So the Atmos stuff on amazon is showing 2.0 and Disney Atmos is showing 5.1

1. Using the inbuilt Apple TV app Atmos supporting content comes through as DD 5.1.
2. I’ve not got a Sky Q box to test with as I’m a Virgin Media customer. The fact that the sync issues with the Xbox & PS4 seem to be solved hopefully bodes well for lip sync and the Sky Q.

Here is what it shows in netflix

 

 

That’s really odd, I’ve just tested with 6 Underground and my Sonos app is reporting Atmos

That is bizarre. I just turned earc off set pass through to no and played it. Turned them back on again and i now have atmos..Thanks for testing this for me zophop its much appreciated. So its all working on my B9 if anyone wants anything testing :-)

Brilliant, glad to hear it’s working for you now matey!

So bizarre. What region are you in if you don’t mind me asking?

I am based in the UK

Cheers - bit frustrating the built in Apple TV app only outputs in 5.1 - hopefully they will fix this through a patch

I’ve just reset my Apple TV and I’m still getting Atmos in Netflix and Amazon but only 2.0 in Disney+, so weird. 

https://www.google.co.uk/amp/s/www.imore.com/dolby-atmos-support-apple-tv-app-coming-lg-smart-tvs-later-year%3famp
 

Looks like built in Apple TV app will be getting Atmos support later this year

When your TV is off, and you power TV on, how long before you hear sound from Arc?

I have LG series8 (previous model), when I power on takes about 2 seconds before I see a picture on TV, and then another 4 or 5 seconds before I see a green LED flash on Arc and I hear sound from Arc.

I previously had a Playbar connected via optical, and I would hear sound as soon as picture appeared, so I’m curious where the delay is.

TIA!

Thanks for sharing and helping out @Zophop!