I've been experimenting with the new Spatial Audio feature on the AirPods Pro with iOS14. It's outstanding. However, I've noticed I'm not getting much height when using a standard 7.1.2 bed (i.e. without objects) in my own recordings. Since some of the demo Atmos files you can find on the web do seem to have a strong sense of height - i.e. the issue isn't at the Apple end - I'm wondering if this an expected limitation of not using objects or it's something specific about the encoding of mp4s with the Atmos Renderer?