High-resolution streaming and conversion without compromise

Meet the DP1—a feature-rich digital interface for audiophiles who want to get the best out of both USB and network sources. With YULONG’s seventh-generation JIC (Jitter and Interfacing Control) processor at its core, the DP1 handles high-resolution formats, syncs cleanly with external clocks, and integrates smoothly into systems with coaxial, AES, optical, and I2S outputs. Whether you're running a multi-device audio chain or streaming lossless from your server, the DP1 gives you clarity, precision, and tons of flexibility.

Built around the JIC processor

The DP1 uses YULONG’s 7th-generation JIC module, a proprietary FPGA-based engine that handles everything from clock synchronization to USB interfacing. This isn't an off-the-shelf chip—it's a deeply integrated, purpose-built processor developed in-house over years of iteration and refinement. The result is stable, low-jitter transmission with minimal digital noise.

Dual-core CPU with audio-optimized Linux

Instead of relying on a general-purpose OS and driver stack, the DP1 runs a stripped-down Linux kernel tailored for digital audio. The dual-core processor communicates directly with the FPGA, handling network streaming, USB transfer, clock PLL, and SPDIF encoding in one tight loop. Everything’s tuned for audio—right down to the memory layout.

Network streaming done right

DLNA, AirPlay2, Roon Bridge, Squeezelite, Spotify, LMS, HQPlayer NAA, Daphile—it’s all available on the DP1. Stream from your preferred server or app without conversion losses or weird workarounds. Plus, it uses I2S in slave mode with dual Accusilicon AS338 oscillators, keeping the clock local and accurate. This gives you a cleaner, more coherent stream than standard USB audio.

Faster, cleaner USB

YULONG’s FPGA+ULPI USB interface is hardware-based—no messy driver layers, no interrupt overhead. It supports PCM1536kHz and DSD1024 natively and avoids the timing drift and conversion artifacts that can plague software-driven USB inputs.

Flexible digital output options

The DP1 offers coaxial, optical, AES, and I2S outputs—each filtered and clocked for minimum noise and maximum stability. Coax and AES outputs support PCM384 and DoP128, while I2S can hit up to PCM1536 and DSD1024.

High-isolation power supply

A 25W linear power supply provides interference-free power. Each major subsystem—CPU, network port, USB, clock, PLL, driver stage—has its own low-noise regulator. The analog design minimizes interference between sections, giving you a quieter background and a more dynamic signal.

Custom display and interface

The IPS screen shows real-time signal spectrums and vintage-style VU meters, adding a touch of analog flair to this digital powerhouse. The interface is simple—just one knob controls all settings. You can customize the display, turn it off automatically, or leave it on to admire the visuals.

Built to last and made to look good

Machined from a single block of aluminum, the DP1's enclosure is sturdy, vibration-resistant, and seamless. Claw-shaped metal feet isolate it from external vibrations, while the global voltage selector makes it easy to use in different regions without needing a step-down converter.

Product highlights

• YULONG’s 7th-gen JIC digital signal processing module
• Dual-core CPU with FPGA-optimized power and streamlined Linux OS
• Dual Accusilicon AS338 low-noise oscillators
• Streaming support: AirPlay2, DLNA, Squeezelite, Roon Bridge, HQ NAA, Daphile, LMS, Spotify
• I2S slave mode with PLL clock sync
• FPGA + ULPI hardware USB interface
• USB input supports PCM1536kHz and DSD1024
• Coaxial and AES outputs support PCM384 and DoP128
• Optical output supports up to PCM192 and DoP64
• I2S output supports PCM1536 and DSD1024
• Word clock input and output
• 25W linear power supply with low-noise regulators
• IPS LCD with dynamic spectrum and VU meter displays
• One-knob control and customizable interface
• Seamless aluminum chassis with anti-vibration feet
• External global voltage switch

Specs

• Inputs:
  • Network
  • USB
  • Word Clock In
  • Outputs:
  • I2S (configurable)
  • AES
  • Coaxial
  • Optical
• Word Clock Out
• Supported formats:
  • USB/Network PCM: up to 1536kHz
  • USB/Network DSD: Native DSD64–DSD1024
  • Coaxial/AES: up to PCM384kHz / DoP128
  • Optical: up to PCM192kHz / DoP64
  • I2S: up to PCM1536kHz / Native DSD1024
• Clock:
  • Dual Accusilicon AS338 oscillators
  • Word clock input/output: 44.1kHz–768kHz
• Display:
  • IPS LCD with dynamic spectrum and VU meters
  • Auto-off feature
  • Customizable UI
• Power:
  • 25W linear power supply
  • Low-noise regulators for each subsystem
  • External voltage selector
• Measurements:
  • THD+N: 0.000008%
  • Dynamic range: 140dB
  • Power consumption: <20W
• Dimensions: 9.8in x 8.3in x 2.4in (248mm x 210mm x 60mm)
• Weight: 5.5lbs (2.5kg)

What’s included

• YULONG DP1 Network / USB Digital Interface
• Power cord
• Remote control
• User manual