User Manual of Douk Audio U2 PRO

Warm tips：

• The U2 PRO supports Windows 10/11, macOS, Android, and iOS. Windows 10 and above can run driver-free for PCM playback up to 384kHz, but higher sampling rate and DSD playback requires driver installation. macOS works driver-free. To avoid potential compatibility issues, it is not recommended to use Windows 7/8, or general-purpose Linux systems. Linux-based audio systems like Daphile, Volumio, and ROON are supported.
• The U2 PRO supports oscillator replacement (not pluggable, needs soldering). Default 24.000 MHz ±20 PPM 5032 active oscillator, can be replaced by DIP-4P rectangular plug-in active oscillators or 5030 SMD active oscillators.
• The U2 PRO only supports 2.0 channel stereo audio. Multichannel formats such as 5.1, 7.1, or Dolby formats are not supported.
• Please install the required driver and files from the included USB drive, and follow the instructions or video guide to set up your player properly.

• Unlock Pristine Lossless Audio: Easily convert the USB signal from your PC, Mac, phone or Raspberry Pi etc. into clean and simultaneous outputs of Optical, Coaxial and I2S. Feed a clear, stable, and jitter-free digital signal to those classic DACs, amplifiers and AV receivers without USB input for an immediate sound quality upgrade.
• Ultra-high Resolution with XMOS XU316: Equipped with the latest XMOS XU316 chip, the U2 PRO ensures virtually no latency, stable signal transmission, and exceptional sound clarity. Supports PCM up to 32bit/768kHz and DSD512, perfect for high-end music streaming and professional audio playback.
• Strong Compatibility via UAC Mode Switch: Specially designed with a UAC mode switch, the 1.0 mode offers plug-and-play, driver-free compatibility for gaming consoles like PS4, PS5 and Switch, while 2.0 mode enables high-resolution audio support for advanced playback needs.
• Expandable Oscillator Design: With ample internal space to accommodate compatible crystal oscillators, the U2 PRO lets audiophiles and DIYers freely upgrade their preferred high-precision clock to further reduce jitter and achieve an even higher level of sonic performance and system synergy.
• Compact Size with Convenient Indicators: Pocket-sized and USB-powered, the U2 PRO includes a USB-C to USB-A/C cable for broad device compatibility—truly plug and play. Real-time PCM/DSD indicators make it easy to monitor sample rates and formats. A simple yet powerful upgrade for audiophiles, gamers alike.

• Brand: Douk Audio
• Model: U2 PRO
• Audio input: USB Type-C
• Audio output: Coaxial/Optical/HDMI-IIS
• USB chip: XMOS XU316
• Output mode switch: UAC 1.0/UAC 2.0
• Max. sampling rate Coaxial/Optical supported:
  PCM：44.1kHz-192kHz/16Bit-24Bit
  DSD：DOP DSD64
• Max. sampling rate IIS supported:
  PCM：44.1kHz-768kHz/16Bit-32Bit
  DSD (Native): 64-512
  DSD (DOP): 64-256
• Operation systems PC-USB supported: W10/W11/Mac OS/Android/iOS/PS5/Switch
• Jitter: 75ps (typical)
• THD+N: 0.000008%
• Working voltage: DC 5V
• Dimensions (W*D*H): 85*79*26mm / 3.35*3.11*1.02in
• Package dimensions (W*D*H): 195*155*70mm / 7.68*6.10*2.64in
• Net weight: 220g / 0.44lb
• Package weight: 400g / 0.88lb