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Unboxing Video
Level mode
Standby mode
- Upgrade Your USB Digital Link: Convert USB audio from computers, phones and streamers to optical, coaxial and I2S simultaneous outputs, bringing modern sources to DACs, AV receivers and soundbars without USB input. Femtosecond clocking and dedicated USB-C power raise the performance ceiling for more lifelike playback.
- Unlock More with Femto Clocking: Crystek CCHD-575 femtosecond clocking lowers phase noise and jitter beyond standard clocking, bringing firmer imaging, cleaner separation and finer ambience cues. Dedicated USB-C power supports premium or linear supplies, matching precision clocking with an equally serious power foundation.
- Unleash Hi-Res with XMOS XU316: Asynchronous USB processing handles PCM up to 32-bit/768kHz and DSD512, delivering high-rate audio for capable DACs with greater clarity and stability. I2S carries the highest rates beyond standard S/PDIF bandwidth, keeping your digital front end from becoming the bottleneck.
- Two UAC Modes for More Sources: Choose UAC 1.0 for driver-free USB audio from PS4, PS5 and Switch, or UAC 2.0 for high-rate PCM and DSD from PCs, phones, tablets and streamers. One digital interface adapts to both console compatibility and serious HiFi playback.
- Built for Easier HiFi Integration: Check I2S compatibility quickly with the printed bottom-panel pinout, while five LEDs show PCM/DSD format and sample rate at a glance. The compact aluminum chassis fits neatly beside your DAC or amp, and the included 2-in-1 USB-A/USB-C cable makes more sources easy to connect.
- Brand: Douk Audio
- Model: U2-PRO-FC
- 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:
- Optical / Coaxial Output
- PCM: 44.1kHz-192kHz/16Bit-24Bit
- DSD: DOP DSD64
- I2S Output
- PCM: 44.1kHz-768kHz/16Bit-32Bit
- DSD (Native): 64-512
- DSD (DOP): 64-256
- Operation systems PC-USB supported:
- Win10/Win11/Mac OS/Android/iOS/PS4/PS5/Switch
- Win7/Win8/Linux (Cannot guarantee 100% compatible)
- Jitter: ≥ 69 ps (typical)
- THD+N: 0.000008%
- Working voltage: DC 5V
- Dimensions (W × D × H): 85 × 79 × 26 mm / 3.35 × 3.11 × 1.02 in
- Package dimensions (W × D × H): 195 × 155 × 70 mm / 7.68 × 6.10 × 2.64 in
- Net weight: 210 g / 0.46 lb
- Package weight: 397 g / 0.88 lb
- 1 × U2-PRO-FC
- 1 × Optical Cable
- 1 × USB-A/C to USB-C Cable
- 1 × User Manual
User Manual of Douk Audio U2-PRO-FC
FAQs
Q: What are the system driver requirements for the U2-PRO-FC?
A:
For Windows 10 and Above: Driver-free for PCM up to 384kHz; Requires driver for higher sampling rate and DSD
For MacOS: Driver-free
For Win 7/8: Requires driver for PCM/DSD
For Android: Driver-free
For iOS: Driver-free
For Linux: Driver-free
For PS4/PS5/Switch: Driver-free
Q: Can I connect the U2-PRO-FC directly to a phone or tablet?
A:
Yes. The U2-PRO-FC supports OTG and includes an OTG-compatible USB cable for direct connection to compatible USB-C phones and tablets. For iPhones or iPads with a Lightning port, a high-current camera adapter is required.
Q: Will the I2S output work with my DAC?
A:
Please check that your DAC's I2S pinout matches the U2-PRO-FC. Mismatched pinouts may not work.
Q:
Can I replace the oscillators?
A: The U2-PRO-FC comes with Crystek femtosecond oscillators factory-soldered to the PCB, so replacement is not recommended.
Q: Does the U2-PRO-FC support 5.1, 7.1, or Dolby audio?
A: No. The U2-PRO-FC only supports 2.0 channel stereo audio. Multichannel formats are not supported.
Q: How do I install the driver?
A: Scan the QR code attached to the device to download the XMOS driver. If the QR code is unavailable, visit the Douk Audio official website. Select the driver listed for your device, then follow the instructions or video guide to complete installation and player setup.
The Upgrade Started With Listening
The Upgrade Started With Listening
From a deep dive by HiFi reviewer Old Guy HiFi to upgrade ideas from U2 PRO users worldwide, we kept listening. That feedback helped drive two defining changes: femtosecond clocking and a new external power input—sharper timing, purer power.
- Audio Input: USB-C
- Output: Coaxial/Optical/I2S
- USB Chip: XMOS XU316
- Max. sampling rate: PCM 768kHz/32Bit, DSD512