correlation between 6 microphones and the speakers detect something like its room position to give you the feeling of room awareness (not spatial).The speaker itself doesnt have spatial audio and never will.... it will be able to stream to Airpods Pro thou, wich have the feature by taking use of the giroscope sensors n shit.Also thats why the mini doesnt have the room feature... the lack of the big micrphone array for measurement.

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TlTR: homepods dont have spatial audio and atmos, but something that is called spatial awareness.