Apple enabled HomePods to be used as the default audio output for Apple TV with a software update released last fall. This allowed all audio from the Apple TV to be sent to HomePod speakers, with a simulated Dolby Atmos soundstage.
With the new Apple TV 4K, tvOS supports HDMI ARC and eARC for the first time. This means that all audio from all input sources can now go out over the HomePod speakers, assuming you have an ARC-compatible TV set.
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