Contributor I

LG C9 + Arc + UB820 / Multichannel PCM for DTS Blu-Ray discs

Forum|Forum|5 years ago
November 17, 2020
344 replies
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I’m running an LG C9 with a Panasonic UB820 Blu-ray player, Sonos Arc + Sub gen 3 + One SL surrounds. The lack of DTS support on the Arc has been frustrating for non Dolby encoded Blu-ray discs, so I have been eagerly awaiting the multichannel PCM update.

It’s finally arrived (thanks, Sonos!) and I tried playing a DTS encoded Blu-ray and… no dice. Still stereo PCM 2.0. Has anyone running a similar set-up managed to get 5.1 PCM output from the Arc?

The C9 supports eARC and multichannel PCM, I’m using 48gbps HDMI cables that support up to 8k60Hz, all of the devices are up to date, I have the C9 set to PCM with eArc enabled, DTS output set to PCM on the UB820… I’m really at a loss here. Any ideas or suggested settings?

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Robboadam

Trending Lyricist I

Hey all,

Has anyone yet got round the issue of DTS being unsupported when you have eARC turned on?

I have a B9 (which supports DTS), but the only way I can get DTS is either turning off eARC, or changing Secondary Audio (on the blu ray player) to On - but then that removes Atmos for those discs.

Funnily enough, when I switch the audio to play through the TV, it all works fine. So maybe the issue is partly on Sonos’s side too?

Do I have any other options apart from toggling eARC on/off every time?

EDIT: Also, I tried it with another Blu ray player, and still had the same issue. So I’m not convinced this is a handshake issue with the TV and Blu ray player - I think there’s a separate issue happening.

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LBJ2

Lyricist III

I just wanted to add a little more info here:

I have a C9, Sonos Arc and had the Panasonic 820. While many DTS UHD discs has a core lossy stream (Gladiator plays perfectly fine on my setup for example in lossy DTS 5.1), all releases from Arrow Video don't. Both Donnie Darko and Pitch Black only has a lossless DTS stream, and won't output any audio when playing the discs. The only option is to turn on PCM, but that only gives you 2.0 audio.

I returned my 820 and went with the Sony 800m2. Seems like the best option now. Or an Xbox.

I have never been able to pass LPCM 5.1 7.1 from the Panasonic 820 through my LG CX to Sonos ARC. only PCM 2.0. Thanks to someone else’s post in this community, I found the very affordable $150 Sony X700/M player w/ great IQ BTW will pass LCPM 5.1/7.1 from the player through the LG CX TV and to my Sonos Arc for my DTS: HD only blu-rays. It was too late for me to return the Panasonic, so I use the Panasonic 820 for all my Dolby Atmos blu-rays discs HDMI 3 and the Sony player for DTS only blu-rays HDMI 4.

A new day !

For the first time ever…I am now able to pass through Multichannel/LPCM 7.1 from the Panasonic 820K playing a 4K UHD DTS:HD disc through the LG CX TV to my Sonos Arc 🤩🤩

Something changed via recent firmware probably with the LG CX TV since the Panasonic 820K has not received a firmware update in some time.

With the LG CX TV sound set to “pass through” I now see Multichannel PCM 7.1 when playing both of these 4K UHD DTS: HD discs on my Sonos App:

"Jurassic World Dominion"4K UHD DTS:HD

"The Revenant" 4K UHD DTS:HD

Previously I would only see PCM 2.0 pass through the LG CX TV with these DTS discs played on the Panasonic 820K player.

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Laird M Malamed

Enthusiast I

Alas, no joy from my Panasonic 820 + LG C9 55”. I did update to the latest software today, and if what Panasonic says is right, then this is still a LG issue. I thought I saw someone with a B9 got DTS 5.1/7.1 to work, but maybe I read that wrong (just with eArc off). I do see that CX machines are working, so perhaps LG did not want to go back so many versions for fixes.

So, HD Fury still in the stack for me! Oh well. No complaints though since it does work.

(Also, separately, no issues with Xbox Series X streaming 5.1 or Atmos though the C9 to the Sonos Arc. That seems fine and while I don’t the Atmos test really shows off the imaging, it does track to position correctly.)

Ken_Griffiths

Alas, no joy from my Panasonic 820 + LG C9 55”. I did update to the latest software today, and if what Panasonic says is right, then this is still a LG issue. I thought I saw someone with a B9 got DTS 5.1/7.1 to work, but maybe I read that wrong (just with eArc off). I do see that CX machines are working, so perhaps LG did not want to go back so many versions for fixes.

So, HD Fury still in the stack for me! Oh well. No complaints though since it does work.

(Also, separately, no issues with Xbox Series X streaming 5.1 or Atmos though the C9 to the Sonos Arc. That seems fine and while I don’t the Atmos test really shows off the imaging, it does track to position correctly.)

Forgive me if I’m misunderstanding your post as I haven’t read this entire thread but I have the LG C9 OLED and I get both DTS 5.1 and MC LPCM 5.1 to pass-through the TV, but I don’t have the Panasonic 820. I’m just using an old PlayStation 3 (slim). Is it DTS you’re trying to pass through?

TV firmware here is 05.30.11 (WebOS 4.5)

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LBJ2

Lyricist III

Alas, no joy from my Panasonic 820 + LG C9 55”. I did update to the latest software today, and if what Panasonic says is right, then this is still a LG issue. I thought I saw someone with a B9 got DTS 5.1/7.1 to work, but maybe I read that wrong (just with eArc off). I do see that CX machines are working, so perhaps LG did not want to go back so many versions for fixes.

So, HD Fury still in the stack for me! Oh well. No complaints though since it does work.

(Also, separately, no issues with Xbox Series X streaming 5.1 or Atmos though the C9 to the Sonos Arc. That seems fine and while I don’t the Atmos test really shows off the imaging, it does track to position correctly.)

You've probably already checked this 100 times… but just in case something was reset at some point:

TV set to: Sound = Passthrough

820 Digital Audio Output set to: Bitstream, Bitstream, Off

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Robboadam

Trending Lyricist I

I thought I saw someone with a B9 got DTS 5.1/7.1 to work, but maybe I read that wrong (just with eArc off).

Yep, B9 works like a charm, but only if you turn eARC off. It’s a right pain having to keep toggling it back and forwards.

I have tried it with other Panasonic Blu Ray players though and have the same issue, and when I dug into it further I have a sneaky suspicion that something’s not right on Sonos side either. But I’ve not got round to going through support with them about it.

R

Robboadam

Trending Lyricist I

I thought I saw someone with a B9 got DTS 5.1/7.1 to work, but maybe I read that wrong (just with eArc off).

Yep, B9 works like a charm, but only if you turn eARC off. It’s a right pain having to keep toggling it back and forwards.

I have tried it with other Panasonic Blu Ray players though and have the same issue, and when I dug into it further I have a sneaky suspicion that something’s not right on Sonos side either. But I’ve not got round to going through support with them about it.

Some interesting comments from Sonos support today when I contacted them:

“Based on the diagnostic when the eARC is on the format of the audio being received by the Arc is Unsupported DTS4 when the eARC is off it transcodes to DTS.”

“Based on checking this Blu-ray player is not included in the list that we have that transcodes the audio format. This is not expected behavior and it requires further investigation.”

They want me to call the support line next week to delve into it further. Hopefully we can get more information on what’s going wrong.

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Robboadam

Trending Lyricist I

So after speaking with Sonos over the phone, and doing diagnostics, they basically are saying that all/most of Blu Ray DTS is a version of DTS called ‘DTS4’, which Sonos don’t actually support.

And the reason I get it when eARC is turned off is because my TV then converts DTS 4 to DTS.

In case this is derailing this thread (which is more about C9 and the lack of DTS at all), I’ve made a new thread about DTS 4 -

If you’re in a similar situation to me, and having to toggle eARC on/off to get DTS, please feel free to get involved in this thread.

Ken_Griffiths

So after speaking with Sonos over the phone, and doing diagnostics, they basically are saying that all/most of Blu Ray DTS is a version of DTS called ‘DTS4’, which Sonos don’t actually support.

And the reason I get it when eARC is turned off is because my TV then converts DTS 4 to DTS.

In case this is derailing this thread (which is more about C9 and the lack of DTS at all), I’ve made a new thread about DTS 4 -

If you’re in a similar situation to me, and having to toggle eARC on/off to get DTS, please feel free to get involved in this thread.

I have the LG C9 TV and it passes-through the supported DTS 5.1 and for other unsupported formats like DTS-X/HQ, I simply switch/use the Mc-LPCM codec on the sending device.

R

Robboadam

Trending Lyricist I

So after speaking with Sonos over the phone, and doing diagnostics, they basically are saying that all/most of Blu Ray DTS is a version of DTS called ‘DTS4’, which Sonos don’t actually support.

And the reason I get it when eARC is turned off is because my TV then converts DTS 4 to DTS.

In case this is derailing this thread (which is more about C9 and the lack of DTS at all), I’ve made a new thread about DTS 4 -

If you’re in a similar situation to me, and having to toggle eARC on/off to get DTS, please feel free to get involved in this thread.

I have the LG C9 TV and it passes-through the supported DTS 5.1 and for other unsupported formats like DTS-X/HQ, I simply switch/use the Mc-LPCM codec on the sending device.

Are you using the UB820 player? I know there’s a way to downgrade DTS-HD to DTS, but it does the same with Dolby too if you turn it on, so you lose Atmos and the like.

I mean, I can also get DTS 5.1 when I turn eARC off, but it’s a pain having to keep switching it every time (and remembering to switch it back on after you’ve watched a movie).

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