ARC and DTS

Your LGC1 won't pass through DTS no matter what Sonos does. LG doesn't support it.

I have a similar setup expect I'm playing my DTS disks on a PS5. It's converting DTS to LCPM surround no worries. 

I reckon the device that isn't playing ball is your blu ray player. Do you have a console that can play Blu rays?

"Your LGC1 won't pass through DTS no matter what Sonos does. LG doesn't support"

That's why I wish this $900 soundbar had at least 1 HDMI input/ pass through so people did not have to deal with having earc on their TV or if TV supports dts through arc/earc. 

I currently have a Vizio atmos sound bar Model SB36512-F6. I also have an LG UBK90 blu-ray player. Should I have my blue ray player connected to the sound bar? Currently I have it connected directly to the TV. As you can probably tell I am not so savvy with all this audio video hook up. Help

Yes, connect the Blu-ray player to the soundbar’s HDMI IN port.

I have CX with an Arc connected via eArc, it was interesting reading all of the issues you’ve had. My setup has been pretty seemless.

Web OS apps like Apple TV and Netflix both happily pass through Atmos. Just the other night we watched Harry Potter and the Chamber of Secrets on 4K Blu-Ray via our Sony 4K player. That movie has a DTS-X sound track and the Sonos app identified it as 7.1 Bitstream. Something in the chain is doing it’s job.

I think that LG 4K player maybe the cause of some issues. None of their models are reviewed favourably and they seem to have compatibility issues with certain discs.

With your current setup GuitarSuperstar is correct, if you want DTS audio you’ll need to connect it directly to the sound bar. Something not possible on the Sonos Arc.

I have an LG UBK90 Blu ray player and an LG CX OLED TV with a Sonos Arc connected to the eARC output of the TV. I have the Blu ray player set to output multi-channel pcm and the TV set to passthrough. Like GDB, when I start the TV and player, the Sonos only sees stereo. But if you change the HDMI input setting (from bitstream to ppm or vice versa -  it doesn’t matter which!) the change seems to make the Sonos awake up and read the 7.1 multichannel. It then stays that way until you turn the tv and the player off. Then it forgets…….

Very frustrating. I usually get around it by using Plex. I have all my Blurays and DVDs ripped there and I use a MacMini transcoding to avoid DTS going to the TV. 

I should have added, that the TV is set to passthrough, so the fact that the original encoding was DTS should be a complete non-issue. The Blu Ray player decodes the disk to multichannel PCM. This then passes through the TV and the Arc should recognize the multichannel PCM, BUT IT DOESN”T! This must be something to do with either the way the LG player codes the PCM signal or an issue with the Arc’s ability to decode it….

Or the TV should tell the Arc it wants to send multichannel PCM and doesn’t (in the right way or at the right time). This could also be a TV problem.