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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O

OmriP

Lyricist III

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?

I was that person and no nobody ever contacted me back.

Y

yofalat611

Enthusiast I

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?

I was that person and no nobody ever contacted me back.

Well the Sonos mod did say “Please don't expect an immediate resolution” on the pinned response from 2.5 months ago. And this thread is nearing its 1 year anniversary. Wonder what the word “immediate” means in Sonos Time™?

Corry P

Sonos Staff

Hi @ste_ms

Unfortunately, I have no further information to share at this time.

"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein

K

kikeminchas

Lyricist III

When I wanted to order the cable recommended a month ago it was out of stock ,other options were quite expensive so I decided to try taping pins 10-12 with a sliver of tape as suggested by @RANDUSR23296 , see page 13 of this thread. HDMI2 does not show the Sonos screensaver anymore (no signal) and I haven't had any audio dropout anymore since 1 month ago. I have not noticed any adverse side effect. If you don't have the cable and/or can't find it you might want to give this a try (be careful though).

Corry PPinned

Sonos Staff

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.

"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein

O

OmriP

Lyricist III

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.

Hey Corry, if that’s truly an LG problem how come the Arc works perfectly fine? As well as any other sound bar I’ve tried except for the beam 2?

M

mjsound

Lyricist III

What Sonos seem to be ignoring is that this became an issue specifically after one of their software updates.

why is it so difficult to get them to look into the issue and acknowledge it.

have now told multiple people not to bother with the Sonos beam due to this issue

R

RANDUSR23296

Enthusiast I

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.

Would be helpful if anyone has links to any discussions about other manufacturers’ soundbars exhibiting the same symptoms, or knows what those sound bars have in common in their eARC implementation that my AV amp and the ARC do not.

I bought my beam and LG from the same shop and both are still under warranty so I guess I still have the option to attempt to send both back and see what happens. I believe other users have already contacted LG.

Corry P

Sonos Staff

Hi @OmriP & @mjsound

I personally really don’t know much about it - I just found the information and shared it with you.

A search will reveal that many people with these particular TVs and all kinds of (non-Sonos) audio equipment experience the same. Here are three examples:

https://www.avforums.com/threads/lg-c1-oled48c16-issues-with-5-1-lpcm-over-earc.2422032/

https://www.reddit.com/r/LGOLED/comments/v9ly92/lg_c1_after_new_update_033006_uncompressed_51_and/

https://discussions.apple.com/thread/254122268

The issues also coincided with an LG firmware update for these particular models, and LG are actively seeking videos and other evidence from their customers in an effort to troubleshoot.

"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein

O

OmriP

Lyricist III

Hi @OmriP & @mjsound

I personally really don’t know much about it - I just found the information and shared it with you.

A search will reveal that many people with these particular TVs and all kinds of (non-Sonos) audio equipment experience the same. Here are three examples:

https://www.avforums.com/threads/lg-c1-oled48c16-issues-with-5-1-lpcm-over-earc.2422032/

https://www.reddit.com/r/LGOLED/comments/v9ly92/lg_c1_after_new_update_033006_uncompressed_51_and/

https://discussions.apple.com/thread/254122268

The issues also coincided with an LG firmware update for these particular models, and LG are actively seeking videos and other evidence from their customers in an effort to troubleshoot.

So you’re saying LG is aware and is actively working on fixing this?

Is there any way to get in touch with the team that works on this to send them videos, diagnostics etc?

Because every time I tried to contract them they responded once after several days then simply stopped answering, it seems impossible to contact them.

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