On a essayé Yamaha MusicCast, un système multiroom audio très ouvert
Controlling your audio system with Alexa voice control
Comment bien acheter son système audio Wi-Fi multiroom (et nos recommandations produits) - CNET France
YAMAHA MusicCast 20 – Enceinte bluetooth 40W – Système audio Multiroom, Wifi, Airplay – Baffle maison – Compatible avec smartphones et ordinateurs – Noire : Amazon.fr: High-Tech
4-Zone Bluetooth Audio System with 8 x Ceiling Speakers | Audio Volt
WiiM Mini AirPlay2 Wireless Audio Streamer, Multiroom Stereo, Preamplifier, Works with Alexa and Siri Voice Assistants, Stream Hi-Res Audio from Spotify, Amazon Music and More : Amazon.ca: Electronics
Build your own multi-room audio system with Bluetooth, Airplay, and Spotify using Raspberry Pis