Home Assistant Connect AUX-2 syncs old but great audio gear with smart speakers while adding serial control, Z-Wave network optimization, and a Bluetooth proxy — powered by PoE or USB.
Integrate your existing gear into your smart home with Home Assistant Connect AUX-2, the ultimate smart home multi-tool. Stream CD-quality audio directly to your Hi-Fi or AV receiver, perfectly synced with your existing smart speakers. Manage solar setups, TVs, UPSs, and more via its USB and two serial ports. Optimize your Z-Wave network by placing it in the ideal spot in your home, and expand your Bluetooth reach with a dedicated antenna. Power over Ethernet (PoE) enables a clean, single-cable setup, with Wi-Fi and USB-C options ready whenever you need them. Best of all, every purchase funds the development of Home Assistant.
Note: A Home Assistant system is required to connect and control devices with Connect AUX-2.
Features
- 🧰 The smart home multi-tool – audio, serial, Z-Wave, and Bluetooth, all at the same time. Just plug it in, and Home Assistant's wizard helps you set it up.
- ⚡ Powerful options – power and data over a single Power over Ethernet (PoE) cable, or use USB-C power with Wi-Fi/Ethernet.
- 🎶 Whole-home synced audio – CD-quality analog or optical audio for your Hi-Fi or receiver, in sync with your smart speakers, and ready for Music Assistant.
- 🎛️ Advanced control – 2× RS-232 and an RS-485 let you control your TV, receiver, or projector even in standby, plus other serial gear (RS-485 adapter sold separately).
- 📡 Connect anywhere – move your Z-Wave network (Connect ZWA-2) to the best spot in your home (adapter sold separately).
- 📶 Rock-solid Bluetooth – a dedicated antenna brings Bluetooth smart home devices into Home Assistant over a stable wired connection (Bluetooth audio is not supported).
- 🛠️ Built to be tinkered with – built on ESPHome and easy to take apart. Ready to go out of the box, or customize it to your needs.
- ✅ Reliable to the core – built by Nabu Casa, providing dedicated support and years of software updates.
- 🏠 Funding Home Assistant – every purchase funds the development of Home Assistant.
What's in the box
- Home Assistant Connect AUX-2
- Warranty and Safety Information leaflet
- Home Assistant sticker
USB-C and Ethernet cables are not included.
Specifications
| Hardware | |
|---|---|
| SoC | ESP32-S3R8 (8 MB PSRAM, 8 MB flash) |
| Audio DAC | TI PCM5122 (112 dB SNR) |
| Ethernet controller | W5500 |
| Power | USB-C (5 V DC, 2 A) or Power over Ethernet (802.3af or better) |
| Typical power draw | Under 1 W |
| Audio | |
| Only one audio output can be used at a time. | |
| Output | 3.5 mm analog or optical (S/PDIF), output only |
| Analog audio | 16-bit / 48 kHz stereo |
| Digital audio | 16-bit / 48 kHz stereo PCM, lossless |
| Codecs | FLAC, MP3, WAV |
| Whole-home audio | Synchronized via Music Assistant (Sendspin) |
| Serial and USB | |
| Serial ports | 2× 3.5 mm RS-232 (±5 V), TX/RX switch |
| USB-A | Connect ZWA-2 (Z-Wave) or USB-to-RS-485 adapter (sold separately) |
| Connectivity | |
| Wi-Fi | 2.4 GHz, 802.11b/g/n |
| Bluetooth | Bluetooth 5 LE proxy, up to 3 active connections |
| Ethernet | Power over Ethernet (802.3af or better), or Ethernet with USB-C power |
| Software | |
| Platform | Built for Home Assistant, built on ESPHome |
| Bootloader | Unlocked, accepts custom firmware |
| Physical | |
| Dimensions | 106 x 63 x 25 mm |
| Weight | 104 g |
| Enclosure | Polycarbonate, white and semi-transparent |
| Operating conditions | Indoor use only, 0 °C to 65 °C, non-condensing humidity. Keep away from direct sunlight, heat sources and excessive dust. |
| Conformity | CE, FCC, RCM |
| Model no. | NC-AUX-9758 |