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Zophop
Trending Lyricist I
June 10, 2020

LG C9 and Sonos Arc

Hey all, my Arc was delivered this morning and I've had a chance to hook it up to my LG C9 directly via eARC and ran a few tests regarding Atmos and other features.

Built in apps:

  • Netflix - Reporting Dolby Atmos (DD+) for Atmos content.

  • Disney+ - Reporting Dolby Digital Plus 5.1 (though this is likely due to the current throttling taking place in the EU)

  • Amazon Prime - Reporting Dolby Atmos (DD+) for Atmos content.

Xbox One:

  • HDMI Audio set to Bitstream out and Bistream Format set to Dolby Atmos has no delay, finally! Displays Dolby Atmos in Sonos app.

PS4:

  • Like with the Xbox, there's no delay on Bitstream HDMI audio

NVidia Shield Pro:

  • Netflix - Reporting Dolby Atmos (DD+) for Atmos content.

  • Amazon Prime - Reporting Dolby Atmos (DD+) for Atmos content.

  • Disney+ - Reporting Dolby Digital Plus 5.1 (though this is likely due to the current throttling taking place in the EU). After connecting up to a US VPN it's reporting Dolby Atmos (DD+) for Atmos content.

  • PLEX - This is where it gets slightly annoying. Playing TrueHD content it reports Stereo 2.0. Setting Passthrough to HDMI reports Dolby Atmos (TrueHD). For DTS content you need to switch the Passthrough setting to Optical which in turn causes TrueHD to playback in Dolby Digital Plus 5.1.

Apple TV:

  • iTunes Content - Reports Dolby Atmos for Atmos content. Non Atmos content reports Stereo 2.0. With Change Format > On and New Format > Dolby Digital 5.1, I receive Dolby Digital 5.1 from non-Atmos iTunes content. I ran this test using Beetlejuice and Avengers Assemble.

  • Netflix - Reports Dolby Atmos for Atmos content.

  • Amazon Prime - Reports Dolby Atmos for Atmos content.

  • Disney+ - Reporting Stereo 2.0 for all content bizarrely. Setting audio output on the Apple TV to Dolby 5.1 allows all content to playback in 5.1 rather than stereo.

My C9 is running firmware 04.80.03 with the following settings:

Sound Out

HDMI ARC selected

Digital Sound Out set to Passthrough

eARC set to ON

Additional Settings

DTV Audio Setting set to Auto

HDMI Input Audio Format set to Bitstream.

 

If there's anything else I can test or any questions, let me know!

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    134 replies

    Bezzer
    Trending Lyricist I
    June 10, 2020

    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

      ZophopAuthor
      Trending Lyricist I
      June 10, 2020

      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?

      Bezzer
      Trending Lyricist I
      June 10, 2020

      The tv 

       

      ZophopAuthor
      Trending Lyricist I
      June 10, 2020

      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?

      Bezzer
      Trending Lyricist I
      June 10, 2020

      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

       

      ZophopAuthor
      Trending Lyricist I
      June 10, 2020

      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?

      Nocturne1
      Lyricist I
      June 10, 2020

      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).

      danielkea
      Enthusiast II
      June 10, 2020

      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?

      Wolf
      Enthusiast I
      June 10, 2020

      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!

        Bezzer
        Trending Lyricist I
        June 10, 2020

        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?

        6 underground..just as a test

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