I just updated my iPhone to iOS 18. My HomePod mini is also updated to software 18.0. It appears that not only HomePod mini supports Dolby Atmos, but it can also support Dolby Atmos via AirPlay 2. See the screenshots below. Note the Dolby Atmos logo below the slider. As a comparison, when selecting a non-Apple device such as Sonos Roam 2, the Dolby Atmos logo disappears.
One may question whether this is merely a logo bug or HomePod mini actually plays music in Dolby Atmos format. I found a way to confirm that Dolby Atmos is indeed supported now.
Dolby Labs has some demo tracks available on Apple Music. For example,
One interesting feature of these tracks is that the base non-Atmos version contains different content from the Atmos version. You can try playing the track No. 5 in this album, "Object based Channel ID" with Atmos disabled. In the non-Atmos version there is a female voice saying "to get a full Dolby Atmos experience, please make sure your device is enabled Dolby Atmos". The actual content only plays when the device supports Dolby Atmos and Dolby Atmos is enabled.
With iOS 18.0 and HomePod software 18.0, I confirmed that when playing these demo track on HomePod mini, either directly or via AirPlay, Dolby Atmos is indeed supported, and the Dolby Atmos content is playing.


One may question whether this is merely a logo bug or HomePod mini actually plays music in Dolby Atmos format. I found a way to confirm that Dolby Atmos is indeed supported now.
Dolby Labs has some demo tracks available on Apple Music. For example,
One interesting feature of these tracks is that the base non-Atmos version contains different content from the Atmos version. You can try playing the track No. 5 in this album, "Object based Channel ID" with Atmos disabled. In the non-Atmos version there is a female voice saying "to get a full Dolby Atmos experience, please make sure your device is enabled Dolby Atmos". The actual content only plays when the device supports Dolby Atmos and Dolby Atmos is enabled.
With iOS 18.0 and HomePod software 18.0, I confirmed that when playing these demo track on HomePod mini, either directly or via AirPlay, Dolby Atmos is indeed supported, and the Dolby Atmos content is playing.


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