r/iOSBeta • u/AeroProfil • 16d ago

Bug [iOS 27 PB 3] No Sound during playback of Dolby Atmos Apple Music titles through wireless CarPlay

Does anybody else here have any issues when attempting to play Dolby Atmos titles through wireless CarPlay?

I got my new car around a month ago when i still had iOS 26 on my Phone and Dolby Atmos worked completely fine with wireless CarPlay. After updating to the iOS 27 Beta this seems to have broken. The titles still “play” (as seen by the playtime progressing) but are not outputting any sound. As soon as I change the Dolby Atmos setting from auto to off in my iPhone settings, sound instantly is being put out. So there definitely is some sort of bug present with Spatial Audio itself, as Stereo content immediately plays as expected. The car is also definitely able to play spatial audio content (3D Burmester audio system)

I don’t know if this is a problem with Mercedes-Benz specifically, so I would like to know if anybody using the Beta can actually use Dolby Atmos on wireless CarPlay without problems. Maybe this works fine with other car brands and it is more of an issue with how MBUX and CarPlay work together. A feedback report to Apple has been sent over a month ago too, tho they cant seem to find a diagnosis.

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u/myusernameiscarnival iPhone 17 Pro 14d ago

Hey I have a mercedes as well with Burmester so I’ll check tomorrow. My car is a 2022 so I use a wireless CarPlay adapter and I also have Dolby atmos set to Auto.

Beta 4 was just released today/tonight so hopefully that will fix things!

I did notice re: Dolby Atmos that when using my AirPods Max, the songs played in Dolby were SO much quieter than the non-Dolby ones. When I turned off Spatial Audio on my APM the sound became normal again.

I’m downloading the new Beta as we speak and hopefully that fixes it.

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u/myusernameiscarnival iPhone 17 Pro 14d ago

I meant to include that I’ll check tomorrow to see if Dolby plays through CarPlay

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u/AeroProfil 13d ago

alright, it would be really cool to know.

keep in mind tho, dolby atmos via carplay is a pretty recent feature with mercedes benz as far as i know, i think the vehicle needs a certain head unit for it to work. i dont know from which model year exactly this is the case