Trending Lyricist I

Multichannel PCM 5.1 dropping out since 14.10 update

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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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Mrlovalova69

Lyricist II

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

Can you tell me how to do the first two steps please, can’t seem to figure it out :/ help would be appreciated!

F

Fskies

Lyricist III

On the main page I go to param of (input/ouput)

And I got settings screen:

M

Mrlovalova69

Lyricist II

On the main page I go to param of (input/ouput)

And I got settings screen:

Thank you for taking the time to show, it’s greatly appreciated. All done and I’ll test it tomorrow! :)

R

Romancin

Lyricist II

@Fskies Really awesome! Followed the steps you indicated and the problem is solved for the moment (fingers crossed!). Thank you very much for sharing!

S

speakers_haver

Lyricist I

I’ve been having this same issue (audio cuts out for 1 second every 1-2 minutes) the past few months with my set up: LG C1, PS5, Sonos Beam gen 2 + One surrounds (with all the OEM cables). Configured with eARC/bitstream/pass through on the C1, AV receiver 5.1 linear PCM on PS5. It’s really been maddening. I usually unplug/replug everything and toggle all the settings for a few hours and then it’ll go away, and come back in a month 🤦‍♂️ Please fix this Sonos…

Looks like this go round, toggling TV sound share on and off in the TV’s settings as someone previously suggested broke the curse. Will try this first going forward

S

speakers_haver

Lyricist I

I’ve been having this same issue (audio cuts out for 1 second every 1-2 minutes) the past few months with my set up: LG C1, PS5, Sonos Beam gen 2 + One surrounds (with all the OEM cables). Configured with eARC/bitstream/pass through on the C1, AV receiver 5.1 linear PCM on PS5. It’s really been maddening. I usually unplug/replug everything and toggle all the settings for a few hours and then it’ll go away, and come back in a month 🤦‍♂️ Please fix this Sonos…

Looks like this go round, toggling TV sound share on and off in the TV’s settings as someone previously suggested broke the curse. Will try this first going forward

Spoke too soon… issue is back this morning and toggling the tv sound share setting isn’t resolving it…

Ken_Griffiths

Spoke too soon… issue is back this morning and toggling the tv sound share setting isn’t resolving it…

What else is connected to the TV HDMI ports? Have you switched off CEC on those ‘other’ connected devices to see if that solves the issue?

R

RANDUSR23296

Enthusiast I

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.

Would be interesting to understand the theory of how this helps, I find this area of WebOS quite mysterious and not sure what it manipulates, CEC command set I suppose but I don’t understand why it needs to know the make/model of the sound bar to do that. I’d also have thought that my C1 factory reset would have covered this step, but it didn’t seem to help in my case, maybe some reset commands are sent during the first step (I don’t know if such things exist in CEC).

On the plus side, I dismantled my setup for a week and there have been no drops for several hours today after I reconnected it.

S

ste_ms

Enthusiast I

I’m having the same problem. I recently upgraded to the new Apple TV 4K which fixed the problem of everything being sent as PCM 7.1 but now with PCM 5.1 I’m getting audio drop outs every minute or so. I’ve tried all the fixes in this thread to no avail.

I’ve done a diagnostic that should capture the issue so hoping to get some feedback if possible @Corry P

Diagnostic 1711446570

S

samjhathaway

Trending Lyricist I

Hi all,

I’m having the same issues.

I’ve recently bought a Sony UBP-X700 4k Blu ray player. Up until now I’ve been using my PS5 but wanted to take advantage of the Dolby Vision and better quality from a 4K player.

However, any 4K disc that doesn’t output Dolby Atmos seems to have issues. It outputs the audio as Multichannel PCM 5.1 but every 20-30 seconds I get a momentary drop out of audio and sometimes no audio output at all. As I said Dolby Atmos plays fine.

My setup:

TV: LG C1

Sonos Beam 2

2x Ones as surround

Sub Gen 3

I had similar issues when first trying 4k discs on my PS5 but I bought a better HDMI cable and this seemed to fix the issue. I’ve done the same this time to no avail.

Any help would be greatly appreciated or if a fix is known.

thanks

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