Home Assistant’s $69 AUX-2 Syncs Old Speakers With Sonos via 5-Minute Setup

3 articles · Updated · XDA Developers · Nov 11

$69 AUX-2 turned a Huawei Sound X into a Music Assistant player that played Spotify in sync with a Sonos Era 100, using the speaker’s 3.5 mm input instead of its aging DLNA features.
Setup took about five minutes in Home Assistant: the ESPHome-based box was auto-discovered over BLE, then configured onto Wi-Fi or Ethernet and handed off to Music Assistant for playback.
Sendspin handles the synchronized multiroom audio over the local network, letting AUX-2 join groups with Sonos, AirPlay, Google Cast and even a Nest Hub, though some Chromecast support remains experimental.
The device is output-only and capped at 16-bit/48 kHz, and its three identical 3.5 mm jacks include two RS-232 ports that could damage audio gear if misused.
Beyond audio, AUX-2 also works as a Bluetooth proxy, serial bridge and network host for Z-Wave hardware, but its strongest appeal still depends on already running Home Assistant and Music Assistant.