Options to extract Audio from Chromecast, now that Chromecast Audio has been Discontinued -OZ
How to turn a Chromecast into a Chromecast Audio for under $6 - YouTube
How to use Chromecast to stream music to dumb speakers (as Chromecast Audio does)? - All About Chromecast
J-Tech Digital - HDMI Audio Extractor 1080p (JTDAT5CH)
16-6713 HDMI Audio Extractor - HDMI to HDMI + Optical + RCA L/R Stereo – AA Electronics
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HDMI Audio Extractor HDMI to SPDIF Out RCA Stereo Audio Splitter Converter For Chromecast HDTV Blue-ray Player PS3 _ - AliExpress Mobile
Amazon.com: 1080P HDMI Audio Extractor,AMANKA HDMI to HDMI Audio Optical and RCA(L/R) Stereo Analog Outputs Video Audio Splitter Converter for Ruku, Chromecast, Blu-ray Player, Cable Box, Fire TV, etc : Electronics