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

Y disculpa por no informar de los dispositivos, en mi caso tengo:

LG C2
PS5
XBOX X
APPLE TV 4K 3 Gen Chip A15
SONOS BEAM GEN 2

La configuración correcta es la que da como resultado LPCM 5.1, pero tiene problema con el sonido. Si Dolby digital funcione para tí, puedes quedarte con eso.

danimiguelm

Lyricist III

Adjunto la información que me da la aplicación Sonos

JUST be HAPPY

danimiguelm

Lyricist III

Y disculpa por no informar de los dispositivos, en mi caso tengo:

LG C2
PS5
XBOX X
APPLE TV 4K 3 Gen Chip A15
SONOS BEAM GEN 2

La configuración correcta es la que da como resultado LPCM 5.1, pero tiene problema con el sonido. Si Dolby digital funcione para tí, puedes quedarte con eso.

Me gustaría saber qué configuración tenéis vosotros de momento que funcione bien. Gracias

JUST be HAPPY

O

OmriP

Lyricist III

Adjunto la información que me da la aplicación Sonos

Esto es correcto. Si no te haces problemas quedate con esto.

danimiguelm

Lyricist III

Adjunto la información que me da la aplicación Sonos

Esto es correcto. Si no te haces problemas quedate con esto.

Pues tengo cortes, lamentablemente tengo corte de audio cada minuto es muy molesto así que tendré que pasar Dolby digital de momento..

JUST be HAPPY

O

OmriP

Lyricist III

Adjunto la información que me da la aplicación Sonos

Esto es correcto. Si no te haces problemas quedate con esto.

Pues tengo cortes, lamentablemente tengo corte de audio cada minuto es muy molesto así que tendré que pasar Dolby digital de momento..

Si esto es el problema que tratamos de resolver.

Puedes configurar tu ps5 para usar dolby digital o DTS hasta que se arregle. No tengo Xbox pero estoy seguro que es posible también.

R

RANDUSR23296

Enthusiast I

When I’m on my ps5 and audio is playing, I turn on my Apple TV (without switching to its source) and the moment it turns on, the audio cuts, just as it does regularly. It returns moments later.

I can repeat this behaviour, as you say it does sound exactly like the regular audio drops. I pulled the power on the ATV a few seconds after the PCM 5.1 dropped on the active HDMI port. There were 3 short audio drops whilst the ATV booted and then the next scheduled dropped occurred at 59 seconds. I’ll try with the A1 next time I have access to the HDMI ports.

Also, I managed to trap the bug into a single HDMI port. Further to observing the PS5 was bugged and the ATV wasn’t, I then repeatedly swapped the HDMI cables between ports 1 and 3 at the TV end. It didn’t matter which device was playing on port 3, it was the bugged one. HDMI 1 also continued without dropouts, regardless if the source device was PS5 or the apple TV. Suggests the C1 isn’t blameless?

C1 firmware updated to 3.34.70, no change in audio drops.

I also sacrificed a “high speed with ethernet” HDMI cable and cut what I think is pin 13 (CEC), but whilst the HDMI 2 video is intact, and I’m now able to de-activate CEC (the remote also stays working), the TV doesn’t engage either eARC or ARC and audio is limited to the TV speaker. I cut the red wire - maybe I should have cut blue 😬

O

OmriP

Lyricist III

When I’m on my ps5 and audio is playing, I turn on my Apple TV (without switching to its source) and the moment it turns on, the audio cuts, just as it does regularly. It returns moments later.

I can repeat this behaviour, as you say it does sound exactly like the regular audio drops. I pulled the power on the ATV a few seconds after the PCM 5.1 dropped on the active HDMI port. There were 3 short audio drops whilst the ATV booted and then the next scheduled dropped occurred at 59 seconds. I’ll try with the A1 next time I have access to the HDMI ports.

Also, I managed to trap the bug into a single HDMI port. Further to observing the PS5 was bugged and the ATV wasn’t, I then repeatedly swapped the HDMI cables between ports 1 and 3 at the TV end. It didn’t matter which device was playing on port 3, it was the bugged one. HDMI 1 also continued without dropouts, regardless if the source device was PS5 or the apple TV. Suggests the C1 isn’t blameless?

C1 firmware updated to 3.34.70, no change in audio drops.

I also sacrificed a “high speed with ethernet” HDMI cable and cut what I think is pin 13 (CEC), but whilst the HDMI 2 video is intact, and I’m now able to de-activate CEC (the remote also stays working), the TV doesn’t engage either eARC or ARC and audio is limited to the TV speaker. I cut the red wire - maybe I should have cut blue 😬

What you’re saying is interesting. For me the ATV is on HDMI 1 and I don’t have sound drops (although it’s usually playing Atmos or stereo content), and the Switch is on HDMI 3 and the PS5 on HDMI 4.

Perhaps it’s HDMI 3 and 4 only which are bugged…

Anyway it’s looking like something with some kind of device polling every 59 seconds.

R

RANDUSR23296

Enthusiast I

Perhaps it’s HDMI 3 and 4 only which are bugged…

Anyway it’s looking like something with some kind of device polling every 59 seconds.

I’ve observed the bug mostly with a single HDMI device connected, which makes me think any polling is coming from the beam2 or C1 itself (hence Quickstart+ setting seemed like a viable lead a few pages back, maybe an LG app interfering in the background).

I’d forgotten about HDMI 4. My C1 is wall mounted since before I noticed the bug. I’d need to re-attach the stand, something for when I have more spare time.

The 1 second dropout might be how an eARC handshake sounds, which could have various triggers - a new EDID appearing upstream, a faulty cable, a buffer overflow...

Y

yofalat611

Enthusiast I

Hmm… I did all my previous tests on ports 3 and 4. When the ATV4K arrived, I moved my PC to HDMI1 but had since set it to either Atmos or PCM 7.1. I set it to PCM 5.1 just now and played a 3 minute song uninterrupted.

Whether this is a “workaround” or just a case of the common “randomly works, but mostly bugged”, can’t say yet. As shared before, my ATV4K worked at first and bugged out on the next use but it wasn’t on HDMI1. Maybe if this persists for over a week, I’ll switch over a different device that heavily uses PCM 5.1.

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