Sonos Arc and Dolby Digital

What specific UHD disc are you testing? What UHD player are you using? Do you have a premium Netflix subscription? If so, make sure the streaming quality in your Netflix account settings is set to High or Auto. Can you post photos of your TV’s HDMI and audio settings?

UHD - Sony X800M2 with 4k LOTR

Yes I have a premium subscription with Netflix for 4K HDR and Atmos Content.

Atm no I cannot post photo’s for the TV I am at work, the HDMI settings are Enhanced, Prioritize Audio Performance, and Dolby Digital Plus Output.

I should add - I tried already every combination of TV and UHD settings recommended online for the purpose of putting DD+ out through the ARC.  Had it so UHD handled the mix, no luck.  Had it so TV handled the mix, no luck.  Right now it’s configured that it sends the signal to the Sonos ARC now for it to work out the mix, no luck.  I also tried swapping my 18gbs cable to the ARC on the TV to the Sonos Arc, no luck.

Be sure Digital Audio Output is set to Auto and BD Secondary Audio is turned off on your UHD player.

I also don’t think the LOTR UHD has a DD+ track. It has a Dolby Atmos and Dolby TrueHD track. Since your TV is not equipped with eARC, the UHD player plays the core Dolby TrueHD track as Dolby Digital 5.1.

Your TV’s native Netflix app should be able to play DD+ and Atmos audio. The native Amazon Video app should also be able to play DD+. That’s what makes me think there must be a TV setting that needs to be adjusted. When you get home, send your settings and I’ll be happy to give you more feedback.

Those are my current settings.

Atmos TRUE HD for my TV is mixed down to DD+ (Atmos Lossy) on my TV, confirmed this in TV Info Panel when playing the UHD.  

Also confirmed on the most recent patch of my TV, that DD+ (Atmos Lossy) is passed through the standard ARC Port.  Pre-patch, DD+ was passed through ARC regardless of Atmos.

The only place it doesn’t say DD+ is in Sonos App.

EDIT** Regardless to how the UHD is handling, why when I play Altered Carbon on Netflix which is an Atmos track, on my TV is converted to DD+ (Atmos Lossy), TV info Panel on Netflix app (and for UHD) says Dolby Digital Plus 5.1 --- why doesn’t Sonos say Dolby Digitial Plus.

Send me your TV settings when you get home. We’ll focus on getting DD+/Atmos to work on Netflix first. Whether or not your TV can downmix a Dolby TrueHD track to DD+ from a UHD disc will be determined later.

Also, do you have any other Blu-ray or UHD discs? Some actually have a DD+ track (usually in another language). If you have one of these discs, it could come in handy for testing purposes.

Don’t mind the setup, just moved in - waiting for mounts.

So in the audio output I have 3 options-

Auto 1 - Send audio to device (unchanged)

Auto 2 - Send audio to device, after multi-channel mix

#3 - Send PCM only

I’ve tried both 1 and 2.

With the sonos sound system attached, I really am only given options that would be to detect a Sony Surround System, modify for Dolby Digital or Plus, and PCM Volume’s.

Did you say there is an HDMI setting? Can you set it to Enhanced?

Have you checked the Streaming Quality settings in your Netflix account?

Have you tried unplugging the TV and Arc from power for about a minute?

HDMI setting is set to enhanced

Streaming Quality only getting 1080p atm with current internet speeds (20d/1u)

I have not tried rebooting the ARC.