Your best bet is to use an audio extractor and since you re using an apple tv 4k you ll want one that supports 4k video.
Apple tv 4k optical cable.
Top comment excellent for connecting and resetting apple tv not only does this cable allow you to charge your phone fast with a fast charger but it gives you the comfort and convenience of having a super long cable instead of those 3 or 4 foot cables that never give you the exact length that you need excellent for connecting and resetting apple tv.
You don t need to use an hdmi cable for anything turn on your fourth generation apple tv and go to settings audio and video audio output.
Hook up your third generation apple tv to power and connect the optical audio cable to your sound system.
4 and thanks to siri you can control it all with just your voice.
Connect the optical audio out from apple tv to receiver.
Apple tv 4k lets you watch movies and shows in amazing 4k hdr and now it completes the picture with immersive sound from dolby atmos.
Unfortunately the apple tv 4k doesn t include native support for optical audio.
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That port could output digital audio including 5 1 and 7 1 surround sound using the toslink optical interface.
Any airplay compatible speaker is listed here including your third generation apple tv.
The apple tv 4 and apple tv 4k no longer have an optical audio port.
You ll need to use this method if your receiver lacks hdmi ports.
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3 stream your favorite channels live.