You can use a Chromecast with the TV turned OFF! For music or smart home control. This video has demo's of four great but rarely applied uses for Chromecast, and shows a little gadget that makes them possible.
For a detailed Description of How to Stream Music and Playlists from any computer's stored music (for example your iTunes library) to a Chromecast check out this video: [ Ссылка ]

If you want to connect to a stereo, for TV viewing, with Audio and Video in perfect sync. check out this video: [ Ссылка ]

Link to HDMI audio extractor shown in video.
[ Ссылка ]

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