LPCM ETA for Arc?

My LG BX updated it’s firmware last night and as of today is passing Dolby Atmos through to my Sonos Arc (from an Apple TV 4K). Even says “Dolby Atmos” in my Sonos App!

So maybe LG adjusted their firmware to pass through something the Arc is compatible with while Sonos get their own firmware sorted?

I have been able to pass atmos from my apple tv 4k to ARC since the CX was released back in April.

Was it certain apps on the apple box that prevented this?

There was an issue where LG updated their firmware to accept LPCM, so the Apple TV 4K would send that (which the Arc isn’t compatible with) and you’d get no sound unless you forced ATV to output at 5.1

Not sure why your CX wouldn’t have that issue unless you didn’t update firmware or something? 

I have kept CX fully up to date.

I only really use my apple tv 4k for the apple content such as purchased movies but have never had an issue playing Atmos or DD 5.1 content.

My settings on CX are are set to passthrough with eARC on, and on the Apple box just the defaults Auto/atmos on.

On sonos App, it showed ATMOS DD+ or Dolby Digital 5.1

Strange.

I believe a new firmware is out in the UK, but currently Im on 3.10.44

Odd. It’s a confirmed issue by Sonos that they need to add LPCM support, you must have just been lucky somehow! 

It is odd I have read a few threads with issues on this and I’ve always wondered why I get no issue, but then I’ve seen other people mention they get atmos and DD5.1 perfectly fine as well.

Could it be that Apple fixed it in tvOS 14? I have kept my C9 on the old firmware but now I’m tempted. 

Hi all.

I just wanted to add my experience.

Its been driving me mad having the same setup with the addition of a Fire Stick 4k…. no problems with my Sonos beam… but when I updated to the Arc I have been having some really random problems.

Before I go into detail… I want to reiterate what someone else has just said… at ALL times playing content purchased from the iTunes store such as 4K ATMOS movies they work fine.. and the ARC outputs in Atmos.

My problems stemmed from other apps on the AppleTV.  Netflix, and Amazon Prime.  Movies that were supposed to be 5.1 were coming out 2,0.   Atmos content was not working at all, and mostly coming out at 2.0.  Then, it decided to loose the centre channel so I could not hear the dialogue.

Researching the problem, I found this thread.  

I grudging accepted that I could not diagnose the issue and I started to use the Fire Stick (which has no problem outputting to the ARC in atmos) or the inbuilt LG apps (My LG is the OLED 2019 model with eARC)

This is so frustrating as ive checked my settings over and over… and there is something that just doesn't work.  Lots like this LPCM issue with the arc is to blame and I hope they fix it soon.

However… as I said.. ive got no problems whatsoever with iTunes content… its the only app on the TV that seems to do it correctly.  I just cant get my head around why one app works from the same box, and the others dont.

That explains it for me then as to why it works fine, as I only use it for the iTunes purchased stuff.

I’m not on tvOS 14, I’m on 13.4.8 but it might have happened with a recent Apple TV update regardless. 

My BX is on 13.11.10 and I’m in Australia if that makes any difference.