Sonos Staff

Please read if you have encountered issues with 7.1 LPCM playback on Sonos via an LG TV

75 replies
11342 views

Hi,

We want to gather some details from people experiencing issues with playback of 7.1 LPCM audio streams on a Sonos Arc or Beam (Generation 2), via an LG television set. Specifically, when channels are playing from the wrong speakers - for example, but not limited to, if you hear dialogue only coming from the rear speakers, consistently.

If you have experienced this channel mis-mapping, please provide, in this thread, the following details:

Your LG TV model number

Your media source device name and model number or TV app that the issue was noticed on, and the name of the movie/show that was affected

Models of any other HDMI devices connected to the TV (if applicable)

The confirmation number of a Sonos system diagnostic submitted while the affected media was playing and 7.1 LPCM was reported in the Sonos app.

Thank you for your assistance.

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.

Show previous replies

E

efrem81

Lyricist III

Just for information, I don't have problems of wrong audio channels, but with lg C1, arc, sub gen 3 and two one as surround the “source also consistently shows as “multichannel 7.1” problem is completely solved with Apple TV 4K 3rd generation (2022) in fact now always shows "multichannel 5.1" when the track is in that format

S

slongChez

Trending Lyricist I

Just for information, I don't have problems of wrong audio channels, but with lg C1, arc, sub gen 3 and two one as surround the “source also consistently shows as “multichannel 7.1” problem is completely solved with Apple TV 4K 3rd generation (2022) in fact now always shows "multichannel 5.1" when the track is in that format

Seriously? I have my CX and ATV4K 2nd Gen and of course still have the 7.1 issue on it. If you had the previous version and were getting 7.1, did you happen to notice an audio difference at all now that the new model shows proper 5.1?

I don’t have the misaligned audio issues with my full setup at all.

E

efrem81

Lyricist III

Just for information, I don't have problems of wrong audio channels, but with lg C1, arc, sub gen 3 and two one as surround the “source also consistently shows as “multichannel 7.1” problem is completely solved with Apple TV 4K 3rd generation (2022) in fact now always shows "multichannel 5.1" when the track is in that format

Seriously? I have my CX and ATV4K 2nd Gen and of course still have the 7.1 issue on it. If you had the previous version and were getting 7.1, did you happen to notice an audio difference at all now that the new model shows proper 5.1?

I don’t have the misaligned audio issues with my full setup at all.

no, I didn't notice any audio difference, simply now the writing on the Sonos app is the right one.
I had the previous Apple TV (2021) and I too was affected by the 7.1 bug instead of 5.1 read on the app, all resolved with Apple TV(2022)

S

slongChez

Trending Lyricist I

Just for information, I don't have problems of wrong audio channels, but with lg C1, arc, sub gen 3 and two one as surround the “source also consistently shows as “multichannel 7.1” problem is completely solved with Apple TV 4K 3rd generation (2022) in fact now always shows "multichannel 5.1" when the track is in that format

Seriously? I have my CX and ATV4K 2nd Gen and of course still have the 7.1 issue on it. If you had the previous version and were getting 7.1, did you happen to notice an audio difference at all now that the new model shows proper 5.1?

I don’t have the misaligned audio issues with my full setup at all.

no, I didn't notice any audio difference, simply now the writing on the Sonos app is the right one.
I had the previous Apple TV (2021) and I too was affected by the 7.1 bug instead of 5.1 read on the app, all resolved with Apple TV(2022)

Strange, wonder what it’s doing different compared to the previous version.

S

ste_ms

Enthusiast I

I can confirm, went from 2021 to 2022 model and 5.1 shows correctly. However that now means I get the problem of sound dropouts on MPCM 5.1 signals reported elsewhere in this forum

A

Arisk0

Lyricist I

Apple tvOS 16.2 didn’t solved the issue and tvOS 22 from LG CS 2022 neither. Happy new year :(

B

bernd_brot

Lyricist II

I can confirm, went from 2021 to 2022 model and 5.1 shows correctly. However that now means I get the problem of sound dropouts on MPCM 5.1 signals reported elsewhere in this forum

Hi, could you do me a small favor and verify something for me? I have the same issues with the 2021 ATV4K (2ndgen) and I’d like to be completely sure the that the 2022 ATV will solve my issues before I upgrade. Could you please play some 5.1 content on your Apple TV and go into the LG settings → general → channels (or whatever the english translation for that menu point is, should be the 3rd under general) → channel search (it’s the 1st menu point in that submenu) and now press “1” on your LG remote for 5 times: this will open the HDMI diagnostics, now navigate to DVI/HDMI status and expand that part, now you will see a new screen with a “general” subsection at the top left corner, here it will now say either PCM 8ch (if it’s still bugged) or (I pray to god) PCM 6ch. Would be really nice if someone with the newest ATV4K and LG CX/C1/CS/C2 could verify this for me (also “passthrough” should be selected in the audio settings instead of “auto”)!

S

ste_ms

Enthusiast I

It’s definitely 6 CH, just checked;

GENERAL

HDMI3, HPD: HIGH, 5V : HIGH, R×Sense : HIGH 3840×2160P @ 23.97Hz RGB 8BIT NODATA PCM 6Ch 48000HZ

HDMI Mode : HDMI, HDR Type : SDR