having an issue with Netflix Dolby Atmos on my Mac Studio

cagilbenian wrote:

I have m1 Mac Studio. My sound card has 20 outputs

What sound card? There are no expansion slots in a Mac Studio for PCIe or other cards. This must be some kind of external sound device ...

I assume you have already covered basics, but just in case, here is a link to Netflix' instructions about Dolby Atmos on Netflix.

There are also longstanding reports about Netflix only supporting 2-ch. stereo when viewed via web browsers. There is a third party extension called Boom 3D that reportedly enables Netflix 5.1 in Safari. It may or may not help.

cagilbenian wrote:

Maybe you have wrongs. Dolby refeers that is Safari supports Dolby Audio. Mac M1 Mac Studio with Focusrite Scarlett 18i20 has configuration 7.1.4 atmos outputs on my MIDI settings. And I know, with the same audio devices, i get atmos sound with a Macbook Pro.

Then there is some difference between the setup on your Studio vs. your MacBook Pro.

You could start by telling us the exact model Studio & MacBook Pro you have & the versions of macOS & Safari on each. Also if there is any difference in plugins for Safari and if the same version of Focusrite Control software is installed on both Macs & if the settings are identical. Ditto regarding the Audio Midi output settings on each Mac.