So, Gemini says this:
1. The High-End "Audiophile" Solution: Auralic Aries G2.2
This is widely considered the gold standard for digital transports. Unlike most streamers, Auralic designed the Aries G2.2 with a full suite of Digital Inputs (Coax, Toslink, AES/EBU).
• How it works: You connect your Sonos Coax out to the Aries G2.2 Coax input. In the Auralic app, you set the input to "Coaxial" and the output to "USB."
• The Benefit: The Aries G2.2 uses its "Tesla G3" platform to buffer the jittery Sonos signal into its high-speed system memory and re-clock it using dual Femto clocks before "pushing" it out via a galvanically isolated USB port to your Unico Due. This will likely make the Sonos sound significantly better than it has any right to.
or
2. The Modern "Swiss Army Knife": Eversolo DMP-A8
The Eversolo DMP-A8 (and its smaller sibling, the DMP-A6) is exceptionally flexible. It is one of the few modern streamers that allows for complex internal routing.
• How it works: It features a Coaxial Input. You can route that signal internally to the USB Audio Output.
• The Benefit: The DMP-A8 uses a high-performance XMOS 316 processor and high-precision dual clocks. It acts as the "Host" for your Unison Research, providing a stable, asynchronous handshake that the Sonos Connect simply cannot provide on its own.
or
3. The Practical/Budget Professional: WiiM Ultra
If you don't want to spend thousands just to bridge a Sonos unit, the WiiM Ultra is a remarkable tool.
• The Setup: Use the Optical Output from your Sonos (the Sonos Connect has both Coax and Optical). Plug it into the Optical Input of the WiiM Ultra. Then, connect the WiiM’s USB-A port to the USB-B port on your Unison Research.
• The Result: The WiiM Ultra acts as the USB Host and handles the asynchronous communication with your amp perfectly.
any of those work fo you?
