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

Yes, that is my preliminary finding. Also, I suspect that the HDFury Arcana will NOT work if the source audio is decoded 192 or 96 kHz. However, with the DR HDMI 4K, the result looks doable. I am using my fix now and playing back 192 kHz files correctly as downsampled 48K.

As far as I can tell (and others on this thread), the only way to get decoded DTS in multichannel PCM is to use an intermediary device or swap out the Panasonic for a different player. It really depends on how many discs you have and in which formats. You could also rip discs and decode the DTS at that time. Of course, that is a whole other source of pain.

I was just looking at old LG C9 threads at their site, and this was spotted back in 2019. LG said they had fixed MC LPCM then and people reported it working, at least from PlayStations and Xbox’s.

I want to do a few more tests this weekend using the LG 90 UHD player to confirm that does work as expected. (The issue with that player is you cannot chose to decode DTS without doing the same to Dolby Atmos too.) After I have that info, I will chase LG and Sonos on this issue.

That is what I am wondering too. Or could be LG’s. They show 8 channel support, but not which configurations those go to in the EDID.

Thanks @Laird M Malamed for your work on this!

Keep going gents, once we have concrete evidence which manufacturer is to blaim i will be read to bombard them with your findings :D

At the minute all three manufactureres blame the other, however i didn’t think Sonos were to blaim at all initally!

So here’s my experience. I have the LG B9(same as C9/E9 from an Earc standpoint), Sonos Arc + One sl surrounds. I run 4k disc on my Sony ubp-x700 player. For the longest time I couldn’t play any DTS disks in anything other than stereo 2.0. I haven't had a chance to test the LPCM update for the Arc until last night. With my LG B9 set to “passthrough” instead of “Auto” under the HDMI ARC setting I put Inception 4k(DTS-HD Master Audio 5.1) in the x700 player, changed the “Digital Audio Output” to PCM and Hallelujah. Sonos app reads Multichannel PCM 5.1. The sound is by far better than that stereo 2.0 crap. I am one happy camper. I should also note 2 things. (1) I tried this with the Inception standard blu-ray on my ps4(slim) with it set to LPCM and the result was same. Multichannel PCM 5.1. (2) The tv HAS to be set to “Passthrough”. When switching back to “auto” I DO NOT get Multichannel PCM 5.1, only stereo 2.0. 

I'm gonna test Bad Boys for Life 4k as it has a DTS-HD Master Audio 7.1 to see about any possible downmixing issue with the Arc update. 

@Sonosrookie20 unfortunately, there are still indeed issues when down-mixing LPCM from 7.1 to 5.1.

That being said, has anyone confirmed whether Dolby TrueHD down-mixing from 7.1 to 5.1 experiences the same issue? I know the CEO/tech team has acknowledged the LPCM issue on twitter and reddit, but not sure if it affects Dolby content as well.

@jkossis I tested a Dolby TrueHD 7.1.2 test tones video from my Dolby Atmos demo Blu-ray on my 5.1.2 Arc/Sub/Play:1s setup. The test tones for the left and right side surround channels played perfectly clear out of my Play:1 rear surround speakers indicating that the Arc will take a 7.1 track and mix the two side surround channels into the two rear surround channels. 

I plan on testing the same with a DTS demo disc next week.

Perhaps the point has been made above but just to reiterate:

1. 
   Using HDFury to direct LPCM audio from a DTS 4k audio stream running in a blu-ray player into HDMI port direct of LG CX or bypassing LG CX to Sonos ARC directly if it is a DTS 7.1 audio stream turns into LPCM 7.1 (from Blu-ray player)
2. This runs into the issue Sonos arc has which has still not been fixed of downsizing being wrong for LPCM 7.1 to surround 5.1 setup.

there is no issue for blu-ray disks supporting DTS 5.1

The Arcana only solves the handshake issue between UB820 and LG Cx to get UB820 to output LPCM for DTS mastered disks. As others have pointed out Sony blu ray player doesn’t have the handshake issue but regardless we still run into the following problem:

if it is LPCM 7.1 output ( DTS Mastered 7.1 streams) Sonos arc still has an unresolved bug after LPCM update that it doesn’t downmix properly from 7.1 to 5.1. @GuitarSuperstar @iBoyley @Laird M Malamed 

So if you have UB820 and LG CX, you need Arcana and Sonos arc firmware update. If you have Sony blu-ray player and a TV capable of passing LPCM you need Sonos arc firmware update. If you have either blu-ray player and a Samsung 2020 TV or projector LSP9T as I do which cannot pass LPCM, you need Samsung firmware update and Sonos firmware update.

@madhav Next week, I’ll be receiving a DTS demo Blu-ray disc that includes a 7.1 DTS test tones video. I’m very curious to see how the Arc handles the 7.1 PCM audio my Panasonic UHD player will send it.