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rmartin7
August 5, 2023
Answered

Sonos Arc, Apple TV 4K and eARC setting on LG OLED C3

I just bought a new Sonos Arc and LG 65OLED65AUA tv.  Everything seems OK but I am having problems with sound from my Apple TV 4K (latest version).  I only get sound when Dolby Atmos content is played, no sound with Dolby 5.1, HD, etc.  I spent and hour with Sonos phone  support yesterday.  We were unable to find a solution.  I tried different settings on the Apple TV and LG tv.  Today I turned off the eARC setting on the LG tv and now all is working.  I think with eARC there is more information transferred with ARC and there might be a slight difference in sound  with Dolby Atmos.  The eARC was turned on automatically when I installed the Sonos Arc on the LG tv.  Just curious why the eARC setting seems to fix the problem.  Thanks.

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GuitarSuperstarAnswer
Lead Maestro
August 6, 2023

Set the TV to these settings:

HDMI Input Audio Format: Bitstream

Digital Sound Output: Pass Through

eARC Support: On
 

Set the Apple TV audio settings to this:

Change Format: Off

Dolby Atmos: On

 

Then do this:

Disconnect everything from the TV and unplug the Arc, Apple TV, and TV from power for a couple of minutes. Plug everything back in but keep everything disconnected. Make sure Simplink is enabled in the TV settings. Run TV Setup in the Sonos app and follow the app instructions. When the app instructs you, connect the Arc to the TV’s HDMI eARC port using the Sonos-supplied HDMI cable. After the Arc has been successfully connected, connect the Apple TV to the TV.

"Receive with simplicity everything that happens to you." - Rashi
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BrokenHope
Lyricist III
August 27, 2023

Try disabling 4:4:4 pass through, that setting shouldn’t be used for the Apple TV. It’s for PC/Consoles.

like I said I have zero issues on both a C9 and G3 so no idea why you’re having so many problems.

rmartin7Author
August 27, 2023

When I had everything working I tried disabling the 4:4:4 pass through just to see if I could and the problem recurred.  At least with those settings I could get it to work for a while.

Juno8
Lyricist III
September 11, 2023

After six months… LG is finally refunding me the entire purchase price of my G2. 

rmartin7Author
September 11, 2023

Wow.  I am not sure a different TV would solve my problem.  All of my devices work fine except for the Apple TV 4K 3rd generation.  I think the problem lies there.  It’s good to know LG would provide that level of support.  Thanks for the reply.

Juno8
Lyricist III
September 11, 2023

I have the same exact problem as you. The problem lies between the LG, the Apple TV, the Sonos Arc.  I will likely attempt buying the G3. If that doesn’t work, I’ll return it and buy the Sony A95L. 

Juno8
Lyricist III
September 11, 2023

If that fails… i’ll dump the Sonos Arc and start fresh.  Life is too short for this kinda trouble!

Juno8
Lyricist III
September 16, 2023

by the way, and just to be clear, LG support service was the worst I’ve ever experienced. Absolutely horrible. It took six months to find a resolution with their support department. The only reason I was successful is I was willing to spend hours and months pressuring them for a resolution. I’m gnarly like that, beyond what most healthy humans would tolerate :)

    rmartin7Author
    September 18, 2023

    I updated the Apple TV 4K 3rd generation to tvOS 17.0 today.  That had no effect.  Back to using Apple TV 4K 2nd generation. 

    rmartin7Author
    September 19, 2023

    Is there a way for an author of a question in Sonos Community to remove the “best answer” label?  Initially I thought the problem was solved but it turned out it wasn’t?

    Also just a comment.  I would think the Sonos Arc, LG OLED C3 and Apple TV 4K 3rd generation are popular products.  I have only found one or two discussion about similar  problems that I am having with eARC and Dolby Atmos sound and I have searched many websites.  Am I one of the few that has this problem?  I could see many people having this particular combination of products not just me because of their popularity.  Seems weird.

    Airgetlam
    Airgetlam
    September 19, 2023

    Not for the author, no, it requires a forum moderator. However, it does seem that the vast majority, at least from what I can see, ignore that ‘function’ completely, likely for that very reason. 

    Bruce
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