Arc/Atmos - TV support for passthrough from Apple 4k?

Really??? My new LG 75NANO90UNA has EARC which I have connected to the Sonos Arc, I have tried all settings on the tv ate arc and ATV, currently passthru on lg tv and ATV set to Dolby Atmos, and so far I have not been able to get the arc to play any sound when the movie is Atmos, it plays the theme music when on the menu for the movie but as soon as I hit play there is not sound at all. So I totally feel that the arc. cannot process the Atmos signal being send thru the LG tv by ATV (MAT) to it. When I use Netflix on the tv app and play an atmos show (Space Force) it works perfectly, but does not for the LG appletv+ app which apparently does not support atmos at the moment but LG states it will, hopefully on their next update. This is totally frustrating to not have Sonos accept the signal from so many set top boxes like ATV. ! The only thing that gives me hope is that Sonos has stated they will update Arc to accept  LPCM, again hopefully soon. As an aside the Sonos app shows the dolby 

I’m glad that i found this thread as I thought I was the only one having this issue. I have a nano90 and the Apple TV 4K. I also have all brand new 2.1 HDMI cables and whenever anything with atmos tries to play i get no sound at all. If it doesnt have atmos then it plays fine. I currently have atmos just turned off on the Apple TV. Are we sure though that once the ARC supports LPCM then we will have atmos support? My tv also supports atmos on the internal speakers and I tried playing things from the Apple TV with atmos and again got no audio. Meanwhile i played a blu ray and got atmos on the internal speakers. Has any one else tried this?

Really sad to see how Sonos dint really learn from it’s experience with the Playbar and later the Beam. 
 

I haven’t bought a an Arc myself so of course cannot ad anything in terms of possible remedying this issue but I do recognize the years of frustration from working with all of previous Sonos soundbars. 
 

Best advice when buying Sonos for home theater is to plug them in, lean back and enjoy whatever comes out of the speaker. Just hope that whatever setup you have will give you the best the speaker has to offer but don’t ever check the Sonos app for confirmation - that will likely lead to frustration and a long road of frustration end expenses to maybe get things working the way they should. 
 

As always: if you care about what codec you are getting, Sonos really isn’t for you unless you buy a third-party receiver with support for Works with Sonos. 

Seems a very mixed bag of results at the moment, hopefully the arc update isn’t far off, can only imagine those with a lesser interest in the forums etc purchasing an arc and thinking it’s faulty.
 

Like many I have a C9 which has updated to the the latest FW, I do get Atmos from ATV4K on supported movies, but, anything outside that and any app run from ATV that requires 5.1 does not output any dialogue, so it’s ATV for movies & C9 internal apps for anything else.

How are you getting atmos from the arc thru your tv to the arc I guess your lg has a different software that works better with arc to get the signal to the arc any insight would be gelpful

Hi. What TV have you got? The LG C9 has earc and supports ATMOS pass through, so movies I’m playing off the Apple TV will pass ATMOS to the Sonos, but, due to the recent LG firmware update to support LPCM, it’s stuffed the delivery of any content like DD5.1 from the ATV to include vocals as the Sonos can’t process it. 
 

I’ve not made any changes just had to use ATV for only Atmos movies & TV apps for everything else (Netflix etc on the tv will also play Atmos if it’s included so it’s all a mixed bag really.

HDR

Model:75NANO90UNA which has EARC on one of the hdmi. I have the Sonos Arc connected to that and the ATV to one of the. other HDMI 2.1 inputs. Mine must have something in the lg that stops it sending the signal to the arc as if I try an Atmos movie from ATV there is not sound unless I go to the top menu for the movie with extras then. it plays the theme music but again once I start the movie and look at the Sonos app it states silence, at least they got that right it is silent lol. I know it works with the Netflix and amazon prime on my tv and when I look at the Sonos app on iPhone. it has Dolby Atmos as the input. 

Again I guess my tv has a different piece of software than yours that works.

Hi, Hmmm...sounds odd then as logically with earc all should be fine regardless of software. I’m sure you have but as another check ensure:

TV, Go to Settings > Sound > Sound Out. There should be some settings for HDMI ARC. Check it is set for ‘Digital Sound Out’ as ‘Pass Through’.

Yup I just rechecked everything and the HDMI earc is on, the out is passthrough, Atmos is enabled on ATV and the hdmi input for the hdmi that the ATV is connected to is bitstream (I also tried it on PCM ). All results the same no sound when actually playing the movie in Atmos but sound when. its not an atmos movie. I looked at. the app on my phone and it had 2.0 for the input. When everything else is played is states 5.1

Weirdly I just updated the Sonos apps on. my iPhone and MacBook just before this conversation so I really thought perhaps that. update would be support of LPCM

Hi everyone.  I also bought the new LG 75NANO90UNA and Atmos does not work through Apple TV with Sonos Arc. I tried everything and then decided to check the forums..thought I had a bad TV.   Whew., I normally don’t use the apps that come with the tv but I read that Netflix app on LG TV supports ATMOS if you have the Ultra HD plan….I set it up and it works with the ARC.   So I am just going to disconnect the Apple TV 4K until Apple and Sonos fix this.   I have been an Apple and Sonos user for a long time and it is really getting old when they say it supports „this“ and it doesn’t.  Anyway I hope they correct soon.