Cayin Ru7 Full Balanced Resistor Networks Discrete 1-bit Dac

RU7 Discrete 1-Bit Dongle DAC

A Compact Powerhouse — The RU7 redefines what ultra-portable audio can achieve, featuring a discrete resistor-ladder 1-bit DAC, powerful parallel amplifiers, DSD256 support, and shared line-outs — all inside a CNC-milled chassis just 66mm long. It’s an irresistible upgrade for purists and power-users alike.

Key Highlights

• Discrete 1-Bit DAC: Fully differential 4-channel DAC built with 128 thin-film resistors, derived from the N7 architecture.
• High-Output Amplifier: Parallel-driven phone amp delivers up to 400mW @ 32Ω (balanced).
• DSD & PCM Support: PCM up to 384kHz, native DSD256, and all-to-DSD conversion for any format.
• Volume Control: 100-step resistor array volume adjustment via 3 discrete segments.
• Line-Out Mode: Fixed output (1.2Vrms SE / 2.4Vrms BAL) for use as a mini 1-bit DAC.
• Dual PCB Design: Separate analog/digital 6-layer boards to reduce crosstalk and interference.
• Leather Case Included: Magnetic handmade soft case with adhesive metal mounting pads.

Outstanding Engineering

The 1-bit DAC in RU7 is fully discrete and operates via 128 thin-film resistors (4×32) in a precision network. Audio signal is converted through a high-speed LPF and then passed to the analog stage. To retain fidelity, all audio — whether PCM or DSD — is converted to DSD format before DAC processing.

RU7 also features a three-segment resistor network volume control system with 100 steps, enabling extremely precise low-volume output suitable for sensitive IEMs.

Amplifier & Output Modes

The dual-channel amplifier works in parallel to boost power while maintaining balance and low distortion. You can switch either 3.5mm or 4.4mm port into dedicated line-out mode — perfect for connecting to amps or speakers while bypassing volume control.

Specifications

Included in the Box

• RU7 Dongle DAC
• USB Type-C Cable
• USB-A to Type-C Adapter
• Protective Leather Case (Magnetic)
• User Manual
• Mounting Adhesive Metal Pads x2

About Tax & Customs

Please note that free shipping does not include local customs duties or taxes. Customs policies vary by country. If your region has special clearance procedures, kindly notify us after placing your order. If the package is refused due to high tax, refunds will not be issued. We can provide commercial invoices if needed for clearance. Thank you for your understanding.