Make HomePod mini work as home theater speakers
Why can’t I use HomePod mini as home theater? It appears to advertised to be used as a home theater speaker. I paired two mini’s together but cannot make them the default speakers in the HomeKit app.
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You need Apple TV 4k and the big HomePods (not minis) to set as default audio, but you can still stream audio from Apple TV to HomePod mini or a HomePod mini stereo pair using AirPlay.
Set up home theater audio with HomePod and Apple TV 4K - Apple Support
HomePod mini and other AirPlay 2-compatible speakers are not supported with home theater audio.
Use Apple TV to play audio throughout your home - Apple Support
- Do either of the following:
- Press and hold the TV
button on the Siri Remote to open Control Center, then select the Audio Controls button 
. - If you see the Audio Controls button in an app, select it.
- Press and hold the TV
- A list of available audio devices appears, organized by room (as assigned in the Home app on your iOS, iPadOS, or macOS device).
