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30-Day Return
2-Year Warranty
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Douk Audio U2 Digital Interface DDC with XMOS XU316 USB to SPDIF Converter
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User Manual & Driver 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 by scanning the QR code on the U2 PRO or downloading from our official website, 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 asynchronous transmission, 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
- U2 PRO Digital Interface ×1
- Optical Cable ×1
- USB-C to USB-A/USB-C Cable ×1
- User Manual ×1
Hear What They Say about the K5
Old Guy Hifi
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MrJayBee Intl
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Elevate Your Digital Audio Experience
U2 PRO delivers high-resolution audio up to PCM768kHz and DSD512. Flexible output, virtually no latency with XMOS XU316, switchable UAC modes and game console support make it perfect for audiophiles and gamers alike.
Douk U2 PRO is so good, want to upgrade the 24.000 MHz Quartz.
Hi Upgrade Heaven, would you advise where to get the Quartz, I was told that the voltage is 1.8V, but the photo shows the TCXO is of 3.3-5V , does it work flawlessly?
Did not get the unit after 1 month of ordering (and I live in one of Canada's major city) This is NOT a review of the unit itself but of the poor shipping partners and management
I use the Douk Audio U2 PRO XMOS XU316 Digital Interface DDC Reclocker connected between my iPad Air and DAC then to amplifier to play Apple Music. In this setup i’m experiencing frequent blips and little skips in the music. However when connecting the iPad directly to the DAC I do not get those blips and skips, so its not an internet signal issue. Could it be a compatibility issue between the iPad and the U2 Pro? Changing the UAC 1.0 & 2.0 switches at the bottom of the U2 Pro makes no difference
The Douk U2 pro arrived yesterday, I intended to try the U2 pro I2S output to my PS Audio Direct Stream Junior DAC.
The unit comes with very impressive metal body, small, but absolutely well engineered. My system consists of Soundgenic NAS, easy enough, connect NAS USB output to U2 pro, then use a TV HDMI cable as I2S cable , connect from U2 pro to DSJ DAC using I2S.
Wow, wow, the sound is incredibly organic thought I2S , much much better than streaming from NAS. I listen disc by disc, DSD and PCM , this little monster has totally change my system to another level.
If you own a DAC with I2S input, must give it a try.
A must buy item.
After the flood of reviews that came out in favor of this little DDC I decided I could afford to roll the dice on $70 to see and hear for myself. I just got it and I have to say I'm amazed at what this little Douk U2 Pro '25 Does. I've got a 2 WiiM Ultras - both connected to very good external DACs both of which are fed from the Ultra via USB and both DACs offering Galvanic Isolation. One system feeds a full Bang & Olufsen system the other set up feeds a pair of ZA3 Monoblocks with Burson OpAmps. Both Systems sound very good. I put the U2 Pro '25 between WiiM and DAC in boths systems - and I have to say, it's remarkable what $70 does. in both systems the degree of instrument separation is quite noticeable, stage is a little wider but what I though were really good systems now have such an inky black background that voices just float out and the bass just pops. It doesn't change the tonality or cause the bass to boom, it's like each of the notes that make up the bass frequencies are separated then brought back together with greater distinction or resolution. It's not like the U2 Pro makes a hugely profound difference to the sound, yet it's not subtle. It is incredible. This is a very strong and high value audio piece. Highly Recommended.
