4k blu-rays have no sound on Arc Ultra

One of my previous TVs (a Vizio of an older vintage) had the capability of generating Dolby Digital from the internal apps, but it was not capable of passing through Dolby Digital on the HDMI inputs. Since replacing that TV, I’ve always been suspect of chipsets in various devices. Most times they’re great, but I never take an assumption. 

I am working late as well. Yes that would be awesome. I appreciate the help. I was hoping someone would have the same player.

So now only the Vizio TV could still obstruct DTS?

Seems iffy, if it handles 4K video, but until we get a Vizio model number, it is still a possibility…audio chipsets are not the same as video chipsets, and their output is often two different locations. ;)

Set the Panasonic bluray audio setting to send DTS as PCM and you will get Mutli-channel PCM. For DTS-X you should get 7.1 PCM but not height channels. Sounds like you’re TV might be the issue. 

PCM is only 2 channel  stereo. Not why i paid $3000 for a theater sound.

if your TV can’t pass DTS you will get Multi-channel 5.1 and 7.1 PCM with a Panasonic 4K bluray. 
 

Maybe something here? PCM can be 2.0, 5.1 or 7.1 if I'm reading the documents right. 

https://en.community.sonos.com/home%2Dtheater%2D228993/lg%2Dc9%2Darc%2Dub820%2Dmultichannel%2Dpcm%2Dfor%2Ddts%2Dblu%2Dray%2Ddiscs%2D6850976?postid=16489312#post16489312

That thread is so old it would be more confusing than anything.