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throwawaybeam2
Trending Lyricist I
June 29, 2022

Multichannel PCM 5.1 dropping out since 14.10 update

Anyone else experiencing the same issue? Multichannel PCM 5.1 blanks out for a second every 1-2 minutes. I don’t think it’s a bandwidth issue as it works flawlessly with Multichannel PCM 7.1 (thorough test) and Dolby TrueHD Atmos (quick test). And it may have been caused by the Sonos 14.10 update. Setup is PS5→ LG C1→ Beam 2 (via earc).

 

2 weeks ago before the 14.10 update, I watched a bluray film wherein I had my PS5 transcode the DTS-HD MA 5.1 audio to Multichannel PCM 5.1 (as the C1 does not support DTS) and had no issues. Earlier today, I played a bluray film for the first time in 2 weeks and I encountered consistent audio dropouts every 1-2 minutes. It had the same setup where DTS-HD MA 5.1 → Multichannel PCM 5.1. I tested other bluray discs including the one I watched 2 weeks ago and they all now have the same issue.

 

Curiously, I’ve been gaming heavily on my PS5 the past two 2 weeks and haven’t had any audio issues. Then I realized that I’ve been using Multichannel PCM 7.1 when gaming on my PS5. So I made some changes under the PS5 sound settings to make it output Multichannel PCM 5.1 instead. Lo and behold, I am now getting the same consistent dropouts in games and even on the PS5 main menu.

 

I think it’s due to the Sonos 14.10 update as that’s the only firmware update I’ve done in the last 2 weeks. No PS5 update, no LG C1 update. Well actually while I was composing this post, I received and applied the latest LG C1 firmware update and I still have the same issue.

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    Pinned Reply By Corry P

    Hi @throwawaybeam2 et al

    We now recommend you reach out to the TV manufacturer (LG) as this behaviour is also occurring with different soundbar manufacturers (so it’s not a Sonos-specific issue).

    Alternatively, please utilize different audio formats from McLPCM 5.1 (e.g., McLPCM 7.1, DD+, etc).

    I hope this helps.

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    RANDUSR23296
    Enthusiast I
    October 16, 2022

    @RANDUSR23296 , could you keep us updated here if you receive a reply to your support case? Many thanks.

    Coincidentally I did follow up on progress on the support chat a few days ago. We went through the same L1 questions and was asked to submit a diagnostic. When I pointed out the diagnostic ID already tagged to the issue I was told to then use the phone support for further updates/escalation, which I may try if I can find enough time/patience.

    I did try transcodong LPCM and DTS to Dolby but there was too much lag introduced which I wasn't inclined to investigate.

    RANDUSR23296
    Enthusiast I
    October 25, 2022

    In my case, I have 1 second cutoff every exactly 59 seconds.

    My dropout frequency has also change now to every 59.8 seconds, but the drop remains approximately 1 second. The only relevant thing that I’m aware has changed (other than the dog destroying the TV remote) is Sonos firmware, now on 14.18 (without the grey dots in the app).

    Mrlovalova69
    Lyricist II
    October 26, 2022

    I'm also having this issue when watching blu ray amd uhd discs on my ps5 that's linked to a lg c1.

     

    All of my setting are 110% correct as I've spent hours going through them one at a time to see if they was causing the issue.

    Please let us know of you get an update/solution!

     

    Fskies
    Lyricist III
    November 5, 2022

    Same issue here with a LG C1 and Sonos Beam (gen 2).

    I get dropouts on Multichannel PCM 5.1 from my Shield Pro.

    It start after the Sonos update 14.18.

    It seem that restart the Sonos Beam (unplug power) temporarily fix the issue but dropouts are back few time after. 

    Airgetlam
    Airgetlam
    November 5, 2022

    Have you provided hard data to Sonos via a diagnostic, and called them to discuss it? Unless you notify them in a call, they don’t automatically look at each diagnostic….

    Bruce
    kikeminchas
    Lyricist III
    November 5, 2022

    Yes, there is at least one user from this post that has done that (see some messages above). Still waiting for a solution/fix.

    Airgetlam
    Airgetlam
    November 6, 2022

    Sure, but there’s no guaranty that the cause of your issue is exactly the same as the previous poster, even if the expression of the issue is the same. 

    Bruce
    Fskies
    Lyricist III
    November 6, 2022

    @Airgetlam I will contact the support this week. We will see ! 

      Airgetlam
      Airgetlam
      November 6, 2022

      Even if it turns out to be the same cause, giving Sonos programmers more hard data to analyze is only a win. And if it turns out to be a different issue causing what may be similar problems, then they can identify that, and help resolve it. 

      Bruce
      Fskies
      Lyricist III
      November 7, 2022

      Okay, so I fix it by myself. It wasn’t a Sonos issue but an LG issue. I saw that a lot of people with that issue own an LG TV. So I look for more information on that. I found an issue on Reddit link to 5.1.

      What I did on my LG C1

      • Remove my Sonos Beam from the external output as a sound bar
      • Reconfigure Sonos Beam as a sound bar (Sonos is not directly proposed by LG you have to enter the brand in the search bar)
      • Uncheck one of the conditions of use to reboot of my LG. 

      Since I don’t have issues anymore and that without reset!

      WebOS version: 03.33.11

      Sonos version: 14.18

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