Build your own multi-room audio system with Bluetooth, Airplay, and Spotify using Raspberry Pis
Rockville ROCK MATRIX 4 Zone Home Audio Amplifier Receiver Multi Room System - Rockville Audio
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Dayton Audio WBA51 Multi-Room Wi-Fi Streamer for AirPlay and Spotify Connect
Bluetooth Wall Music Amplifier Music Controller Keypad Panel Home System With 15w Ceiling Speaker For Multiroom Audio Solution - Home Theater Amplifiers - AliExpress
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IEAST AudioCast Pro M50 wireless WiFi audio receiver multi room airplay Bluetooth 5.0 music box hifi system spotify tidal pando - Walmart.com