Google Chromecast Audio review: take your speakers online for £30 | Google | The Guardian
Multi-room Audio with ChromeCast Audio and Lepy (Poor man's Sonos)
Amazon.com: WiiM Pro AirPlay 2 Receiver, Chromecast Audio, WiFi Multiroom Streamer, Compatible with Alexa, Siri and Google Assistant, Stream Hi-Res Audio from Spotify, Amazon Music, Tidal and More : Electronics
Google Home multi-room music setup explained: Nest, Chromecast and more
All Chromecasts can now be used for multi-room audio - FlatpanelsHD
Google updates Chromecast Audio with multi-room support, hi-res audio playback – GeekWire