There’s an app on Xbone called Dolby Access - If you install it, you can enable Dolby Atmos on a compatible stereo. The app is still in Beta I think but it works great. Once installed, it tries to make you pay $14.99 for something that makes it work with headphones, but the stereo part is free.
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Nice does the one x have dolby vision too?
Not sure - I have the One X but I’m dragging my feet on a 4K TV.