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MakeItSo
Contributor I
August 1, 2021
Answered

Why is Sonos Arc having eARC issues?

I have a Sonos Arc connected to an LG CX TV and the two devices aren’t working well together when eARC is enabled.  After much, much research into the topic online it appears to be an issue with the Sonos Arc and newer Samsung TV’s too.  It appears the implementation of eARC by Sonos and the higher end TV manufacturers attempting to implement eARC is not going so well.  I would encourage Sonos to work with LG and Samsung to get this figured out as consumers are spending a lot of money on this high-end equipment and deserve a better experience.

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MakeItSoAnswer
Contributor I
August 2, 2021

Played around with the LG settings this evening and when I changed the setting Digital Sound Out from “Pass-Through” to “Auto” everything was working fine.  Non-Atmos sound now showing up as “Dolby Multichannel PCM 5.1” and Atmos content still showing as Atmos, with no DD+ downgrade.

 

 Thank you.

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MakeItSoAuthorAnswer
Contributor I
August 2, 2021

Played around with the LG settings this evening and when I changed the setting Digital Sound Out from “Pass-Through” to “Auto” everything was working fine.  Non-Atmos sound now showing up as “Dolby Multichannel PCM 5.1” and Atmos content still showing as Atmos, with no DD+ downgrade.

 

 Thank you.

tricksy
Contributor I
September 23, 2021

I have an LG Nano86 with Sonos Arc/2xOnes/Sub. It worked perfectly for about 6 months, after which the LG started to lose the eARC connection and revert to its internal speakers. I assume this is a result of a software “upgrade” - either LG or Sonos - as nothing else has changed.

 

I’ve tried switching the Digital Sound Out setting to Auto (previously Pass-Through) but the problem persists.

 

Hugely frustrating! I don’t know whether this is Sonos’ fault or LG’s. I am quite certain that each will blame the other. Meanwhile I have a full Sonos equipped cinema sound system but we are listening to the tinny internal speakers.

 

I am thrilled.

tricksy
Contributor I
September 24, 2021

LG are sending an engineer (!?) to my home to look into this. I am sceptical (anticipating only some power cycling…) but will report back if anything of interest should be identified.

    MakeItSoAuthor
    Contributor I
    November 26, 2021

    Looks like latest LG CX firmware update (4.30.35) finally fixed this issue.  I am able to set TV audio (Digital Sound Out) to “Pass Through” and have non-Dolby Atmos audio play properly from the AppleTV4K through the LG CX to the Sonos Arc via eARC.

      Traderofkind
      Contributor I
      December 24, 2021

      Audio seems to be mostly sent correctly from Apple TV as LPCM but 5.1 content is passed as lpcm 7.1.  It seems the channels are all passed correctly but it causes a significant decrease in volume when using eArc. Switching back to Arc from eArc appears to work correctly at first but after restart Dolby Atmos does not come through.  Deleting the universal control profile for my Apple TV immediately cause Atmos to return. Is short.  It’s a mess and appears the lag CX is indeed effecting eArc improperly. 

      MakeItSoAuthor
      Contributor I
      December 24, 2021

      Indeed it is a mess.  Every time LG does a firmware update it works fine until I turn off the TV.  After that it stops working again.  My solution at this point is to leave the TV audio set to “Pass Through” and change the setting in the AppleTV to Change Format: On, except for when I watch Dolby Atmos content.  Pain in the a$$ but it seems to work around the issue.

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