Skip to main content
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.

    This topic has been closed for further comments. You can use the search bar to find a similar topic, or create a new one by clicking Create Topic at the top of the page.
    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.

    View in thread

    516 replies

    Show previous replies
    MJW75
    Enthusiast I
    May 19, 2023

    Is this one good?

    https://a.co/d/3ulDEy2

    It was linked here before, and I can order it, not sure whether it works though.

    This is the one I originally posted about which is on UK Amazon and in stock. 
    GeoHN.G 8K Fiber Optic HDMI Cable 1M

    MJW75
    Enthusiast I
    May 19, 2023

    Just found this thread from a version of the issue linked on Reddit.

    Do you have a link please? I searched Reddit and found nothing. 

    OmriP
    Lyricist III
    May 19, 2023

    Is this one good?

    https://a.co/d/3ulDEy2

    It was linked here before, and I can order it, not sure whether it works though.

    This is the one I originally posted about which is on UK Amazon and in stock. 
    GeoHN.G 8K Fiber Optic HDMI Cable 1M

    Yeah unfortunately it says unavailable for me on that one, probably because it doesn’t ship here. Was looking for alternatives.

    TheCaseAce
    Lyricist II
    May 21, 2023

    Just to put another confirmation in the thread, GeoHN.G 8K Fiber Optic HDMI Cable 1M worked for me. 

     

    Basically as other posters have said, use the cable with the ‘display’ end plugged into the Sonos and the ‘source’ end plugged into the TV. I’ve used this for little more than a week and had no problems with it. 

    Elvis33
    Lyricist II
    May 21, 2023

    Well, I've been using the hdmi 8k cable solution for more than a month and there had been no problem. This week LG updated its firmware and the cutting problems returned, be careful with your update, I'm talking about firmware 03.33.15. It seems that the problem is LG, or at least that both companies hate each other. 

    pcfarrar
    Lyricist III
    May 23, 2023

    15.4 is out now, I’ve installed it on my system but not tested it yet. Prepared to be disappointed though. 😁

    pcfarrar
    Lyricist III
    May 23, 2023

    Can confirm drop outs still happen on 15.4. 🙄

    OmriP
    Lyricist III
    May 23, 2023

    The dropouts are back again, completely randomly.

    Turned on the TV and they’re suddenly back after several weeks that they were gone.

    Nobody cares apparently.

    Neither Sonos nor LG got back to me even after contacting support multiple times.

    This was my first and last Sonos product.

    Completely embarrassing service and support.

    Manofgeek
    Lyricist III
    May 23, 2023

    I was just in a chat with Sonos support, who said to purchase a CEC-less HDMI cable to fix this issue. Which is ridiculous as everything was working fine for me until recently. I’ve noticed that the HDMI 1 port on my LG CX isn’t affected by this bug, it’s only HDMI ports 3 and 4 but if I switch the HDMI cables then HDMI 1 is affected. 

    ste_ms
    Enthusiast I
    May 23, 2023

    So a few months ago we had confirmation that Sonos were investigating this issue - can we get an update @Corry P?

    I remember about the same time somebody had a response from Sonos saying that they were committed to resolving the issue - did that person ever get a follow up from Sonos support?

    Show more replies
    Terms & ConditionsAccessibility statement