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The Douk Audio U2 PRO is a USB digital interface with reclocker function designed to convert and regenerate a USB audio signal in order to feed a DAC, amplifier, or AV receiver with a clean, stable, and low-jitter digital stream. Based on an asynchronous USB interface using the XMOS XU316 chip, the U2 PRO supports high-resolution audio streams up to PCM 32bit / 768kHz as well as native DSD512 via its HDMI I2S output. It also allows conversion of a USB signal from a PC, Mac, smartphone, or Raspberry Pi to coaxial S/PDIF and optical Toslink digital outputs supporting up to PCM 24bit / 192kHz as well as DoP DSD64.
Compatible with Windows 10 / 11, macOS, Android, iOS, PS5, and Nintendo Switch systems, it features a UAC 1.0 / UAC 2.0 switch allowing operation to be adapted depending on usage. UAC 1.0 mode ensures driverless plug & play compatibility with consoles and compatible devices (PS5, Nintendo Switch), while UAC 2.0 mode provides access to advanced high-resolution audio streams.
The U2 PRO also benefits from an audiophile-oriented design with an extremely low typical jitter of only 75ps as well as a THD+N of 0.000008%, ensuring particularly clean and accurate digital transmission. It integrates PCM / DSD indicator lights allowing real-time identification of the audio format currently being played. Powered directly by 5V DC via USB-C, the U2 PRO adopts a compact format of 85 x 79 x 26 mm for a weight of 220g, and comes supplied with a USB-C to USB-A/C cable ensuring immediate compatibility with a wide variety of digital audio sources.

| 1 | Sampling rate indicator |
| 2 | USB-C input |
| 3 | HDMI I2S output |
| 4 | Optical Toslink output |
| 5 | Coaxial SPDIF output |
| 6 | HDMI pin definition |
| 7 | UAC 1.0/2.0 switch |
Technical specifications
| Specifications | |
|---|---|
| Product type | Digital Interface Reclocker |
| USB interface | XMOS XU316 |
| Input | 1x USB-C |
| Outputs | 1x HDMI I2S 1x Optical Toslink 1x Coaxial SPDIF |
| Supported sampling rates | Optical Toslink/Coaxial SPDIF: 24bit 192kHz, DSD DoP64 I2S via HDMI: 32bit 768kHz, DSD DoP256, DSD512 |
| UAC compatibility | UAC 1.0/UAC 2.0 |
| Compatible OS | W10/W11/Mac OS/Android/iOS/PS5/Switch |
| Jitter | 75ps |
| THD+N | 0.000008% |
| General | |
|---|---|
| Power supply | 5V DC |
| Dimensions | 85x79x26mm |
| Weight | 220g |
| Package | 1x U2 PRO digital interface 1x Optical Toslink cable 1x USB-C to USB-A/USB-C cable |
| Input | USB |
| Output | I2S LVDS via HDMI |
| Output | Optical Toslink |
| Output | Coaxial SPDIF |
| Max sampling rate | DSD512 |
| Max sampling rate | 768kHz |
| Color | Black |
| Interface chip | XMOS XU316 |