Curious...are you using the TV apps and how did you know you were getting Atmos? 

Thanks. 

Yes was using inbuilt apps. Netflix said Atmos on the screen on the title page of the show. Also said Atmos in the Sonos app on my iPad.

Sweet...let me try this on my Q80, I tried it though the Apple TV but only saw Dolby Digital 5.1. 

I don’t see how the Samsung Q90R can pass Dolby Atmos as it doesn’t support HDMI 2.1, eARC.  You will only get Dolby Digital 5.1 with that TV.

I think you are right….but shouldn’t it also get Dolby Digital +? I think I read somewhere that it is capable of that 

No, the best you’ll get is Dolby Digital 5.1 which dates back to DVD technology.

Interesting….thanks for the reply, i know i read somewhere that Dolby Digital Plus was possible through Apple TV, something about lossless Atmos. 

The issue is the TV, it needs to have eARC to pass the better sound formats via HDMI to the soundbar.  There are not a lot of televisions that support eARC, which is a new technology that came out in 2019.  A handful of 2019 models supported eARC, none of the Samsungs.

Thank you so much for the replies, I did know about the earc issue, not sure if you are on the boat I am in with waiting for Samsung to release an update but HDfury seems you have found a solution for us missing the earc that will pass through the atmos

I have a Samsung Q90R - it passes through Dolby Atmos through DD+ . Netflix and Prime should give you Atmos

How do you have yours set up and how are you now to tell it’s atmos or DD+? Thanks in advance 

I don’t believe that, the Q90R does not support eARC.

This chart is helpful:

https://www.rtings.com/tv/tests/inputs/5-1-surround-audio-passthrough

@John76, eARC is not an absolute requirement for Atmos. Atmos can be carried on a normal ARC connection using DD+. there are definitely issues with older ARC-equipped TVs not being able to pass through the DD+/Atmos stream though - my 2014 Vizio P series was able to pass DD+ but not DD+ w/ Atmos so it was upgraded to an LG C9. there are multiple reports (like @eugeneclh here and @Geoffa30 original post) of newer ARC-equipped sets working with Atmos to the Arc.

@Geoffa30, sorry i can’t add direct experience for your Q90R but have found my best overall experience when all of the HDMI related settings are set to Auto and Bitstream where possible so the apps and, if you have them, external inputs can detect the capabilities when each powers up or is activated. Currently, the Arc doesn’t support LPCM so Bitstream is necessary.

@John76 , I have a 2019 Samsung Q60R, no eARC. But I can use the internal Netflix and Amazon apps to get Atmos on the Sonos Arc. The “about my system” shows Dolby Atmos (DD+), it is lossy Atmos though.

@Geoffa30 , I get Season 1 of Jack Ryan in Atmos from Prime. But for season 2 , Carnival Row and the other one content that are supposed to have Atmos, I can only get 5.1. Don’t understand why.

Thank you so much for the reply….i was able to get Dolby Digital Plus from Amazon on my Samsung TV 

As people have been trying to tell you, Atmos can be carried via TrueHD/MAT/LPCM (requires eARC) or via Dolby DIgital+ (requires ARC or above).  You can most certainly can get Atmos over ARC via DD+.  Matter of fact, most streaming sites only offer Atmos via DD+.

My mistake, good to hear certain TVs can pass compressed Dolby Atmos using ARC.

Seems we were having internet issues at the weekend. Finally sorted last night. Now both Netflix and Amazon native apps on our Q90R are showing Atmos. 

geoffa30, Apart from Jack Ryan Season 1, what other contents in Prime are you getting Atmos from?

I can’t get ATMOS on my Q90R, Dolby digital plus option is grayed out in settings.  Is the ARC HDMI connected to the one connect box or straight to the tv?

Bdubs, have you tried changing the setting when the Prime app is on screen?

I have a Q60R so I don’t have the One connect box. 

Yes, I’ve tried changing the setting while watching Netflix and Amazon. 

Arc is connected to HDMI 3 of the One Connect. Selected DD+ when connected to Netflix. Also have the Atmos option ticked in sound settings on the TV.

I also have Season 2 showing as Atmos. Cannot find anything else but it seems there aren’t many Atmos titles on Prime.

try searching for “Atmos” on both prime and netflix to get a list.