Use HDMI ARC or eARC with your Apple TV 4K (2nd generation) - Apple Support
Sonos Arc + Sony 940e + Apple TV 4K : r/sonos
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Sanus Soundbar Mount Compatible with Sonos Beam - Height Adjustable Up to 12" & Designed to Work with Any TV - Custom Fit to The Beam for Optimal Audio Performance : Electronics
Apple TV 4K can play audio from your TV (and its inputs) through HomePods - FlatpanelsHD
Anleitung: Apple TV mit Sonos verbinden
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Review: Sonos Arc, a high-end television soundbar with Dolby Atmos
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How to Use Apple TV With Your Sonos Playbar
How To Connect Sonos To Apple TV (All Version) | LivingSpeaker