Trending Lyricist I

Multichannel PCM 5.1 dropping out since 14.10 update

516 replies
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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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Dwarrelpoot

Trending Lyricist I

Yeah it’s pretty annoying. Sometimes the screen goes black for a bit and then comes back, it restarts the connection to the beam when this happens. This is on the optical cable. Normal cable doesn’t do that but I can’t live with the dropout every minute.

lots of the gaming I do is in 5.1 LPCM. The switch doesn’t have any other surround mode and Xbox has a huge delay on Dolby related stuff, and 7.1 is nice and all for movies, but it messes up some positional stuff in games.

the Apple TV is just fine, as long as inputting everything in Dolby digital instead of atmos with fallback to lpcm, but then I miss atmos AND I get the delay the lg c1 adds to Dolby.

live TV same thing; Dolby sources are delayed. 100 percent the TV that does this sadly. Except when I plug in my PC; that just works fine on atmos and Dolby digital. Super weird, but at least a workaround for the lpcm issue (and being able to set atmos to 5.1 instead of 7.1 is a nice touch as well since windows messes up the rear tracks by not sending them at all)

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yofalat611

Enthusiast I

Don’t know if it’s even an HDMI 1 workaround

If you backread, a couple of folks did some tests and found HDMI 1 alone to be somewhat resistant to this bug for some reason. My experience coincide with their findings but as I said it hasn’t been flawless.

Was looking into alternatives if I do choose to refund and the closest comparable device seems to be the Bose 600, but the more I look into that the more I see pages and pages of people complaining that it doesn’t work properly with LG TVs!

I looked into the Bose 600 awhile back and found that there was an issue upon launch where it didn’t work with LGs. But Bose acknowledged the issue and released a fix via software update. Not sure though if you’re referring to new issues that came up since then.

Yeah it’s pretty annoying. Sometimes the screen goes black for a bit and then comes back, it restarts the connection to the beam when this happens. This is on the optical cable. Normal cable doesn’t do that but I can’t live with the dropout every minute.

Do you have a broken fiber optic cable or is the cable “fix” bugged as well? Was just considering to finally purchase one as I currently have a good offer from Amazon lol.

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Wrnhfx

Contributor I

so glad i found this thread as i was starting to lose the plot. Same as everyone else, Gen2 <> LgC2 intermittent sounds drops when PCM 5.1 which is very annoying. Just ordered the cable from Amazon Uk that the OP links too and it was 25% off so if a £13.50 spend fixes it that will make me happy. Just annoying having to spend more to get things to work. Will post back once cable has arrived and I have done some tests

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MJW75

Enthusiast I

Just ordered the cable from Amazon Uk that the OP links too and it was 25% off so if a £13.50 spend fixes it that will make me happy.

It was the OP that posted the fix. 😉

Make sure you have the TV at the source end and the Beam at the other end of the cable when you connect it up otherwise it won’t work.
Fingers crossed a fix will come as I’m sure there are many Beam owners with this issue that haven’t seen this thread.

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Wrnhfx

Contributor I

Ok let's say mixed results. Got the cable all hooked up and then popped a disk in that I knew I had the issue with. Sonos app shows multi channel 5.1 pcm and seemed to play ok, no sound drops. Then we've watched netflix, 4k Atmos and that played fine which was expected. Now we went back to watching the disk again and there was no sound at all from the main film. The menu had background music but nothing when watching the film. Did a full power off and back on and managed to get some sound but now Sonos is only saying stereo pcm. Confused

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MJW75

Enthusiast I

Ok let's say mixed results. Got the cable all hooked up and then popped a disk in that I knew I had the issue with. Sonos app shows multi channel 5.1 pcm and seemed to play ok, no sound drops. Then we've watched netflix, 4k Atmos and that played fine which was expected. Now we went back to watching the disk again and there was no sound at all from the main film. The menu had background music but nothing when watching the film. Did a full power off and back on and managed to get some sound but now Sonos is only saying stereo pcm. Confused

I believe this is a different issue. I get this too occasionally - always after switching HDMI input.

Anyone else get this?

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Wrnhfx

Contributor I

Should have said I've never had this problem before, first time tonight since using the new cable

Fendera

Lyricist III

Seeing as there are no new replies I think this still hasn’t been fixed?

we have bought a Samsung wh-q930c for the bedroom (also lg c1) and there’s no issue on that system at all.

using the optical hdmi still fixes the problem luckily. But lately the screen has been flickering black for 4 seconds before coming back on, as if earc is reapplying.

Also have some audio delay issues on live TV lately; only on Dolby digital streams. Channels that use PCM work just fine, but I think thisnactually is an LG issue since the Samsung had the same thing.

Unfortunately I have the black screen issue as well. I’m using a fiber 2.1 HDMI cable between the Beam Gen 2 and my LG C1. I was playing my Series X and all of a sudden after 10 minutes, I had a short black screen for like 5 seconds, after that the picture and sound came back. It wasnt a one time thing, the black screen issue is there and comes random while playing games, regardless the console I’m using.

I’m sick of dealing with this, sending my Beam Gen 2 back, replacing it with the Arc that apparently doesn’t have this issue at all.

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yofalat611

Enthusiast I

I’m sick of dealing with this, sending my Beam Gen 2 back, replacing it with the Arc that apparently doesn’t have this issue at all.

Sonos: Just as planned. 😆

Fendera

Lyricist III

I’m sick of dealing with this, sending my Beam Gen 2 back, replacing it with the Arc that apparently doesn’t have this issue at all.

Sonos: Just as planned. 😆

Exactly, I wish I could laugh about it. I already have a sonos eco system, sub mini and surrounds as well. There's no going back. The Arc is the only choice at this point, fortunately it's on sale right now.

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