Head tracking is separate function from spatial audio and in itself does not affect the quality of spatial audio (HT can even be disabled in Settings).If it’s head tracking that makes the difference between Apples spatial audio and Dolby Atmos, you may be right. I’ve listened to Dolby Atmos supported games on my Series X and the effect doesn’t compare.
Having produced Dolby Atmos and spatial audio for my iOS app, Vermont Sleep Sounds & Music, you can actually turn off "AirPods compatibility" within the app and compare Dolby Atmos' spatial audio with Apple's implementation and there is a difference. (Try it with the free ocean and wall A/C sounds. The music track is less obvious at the moment.) Clearly, Apple has it's own "secret sauce" in implementing spatial audio for it's products...
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