Cayin RU7 | 1-Bit Resistor Network Portable DAC

Cayin RU7: The New Benchmark in Ultra-Portable Audio

• Incredible sound from a 1-Bit Resistor Network DAC
• Parallel 4.4mm balance/3.5mm single-ended outputs
• Ultra-light 25g weight
  
• High-resolution audio support up to DSD256

Fully Balanced Resistor Network Discrete 1-Bit DAC and Dual Amplifiers

RU7 uses a specialized micro-miniaturized 1-Bit DAC with the power of a standard 4 channel DAC architecture. The array of 128 high precision Thin Film Resistors closely resembles the discrete DAC used in the Cayin N7 DAP. 

Dual amplifiers in parallel provide high output balanced power. The two amplifiers operate in parallel to provide 160mW @ 32 ohms in single-ended output and 400mW @ 32 ohms for the balanced output.

Discrete Volume Control

The 1-Bit DAC design is very demanding of the input signal, and we recommend that you provide the maximum possible digital output volume from your mobile device to get the best signal from RU7. Cayin's specially developed low noise, low power consumption 100 step volume control offers precise control over a wide volume range to power a range of sensitive and harder to drive IEMs and headphones.

Dual PCB Design Minimizes Interference

RU7 uses a similar design to its predecessor, RU6, with two 6 layer PCB boards, separating digital and analog functions of the device. The two layers safeguard signal integrity and keep noise from the reference clock and DSP from bleeding into the amplification circuit.

Low Power Consumption and High Compatibility

Discrete resistor network DACs have low power consumption compared to other integrated DAC designs, and minimize power drain from the mobile source. Combine the DAC design with a carefully designed amplification circuit and RU7 manages a low 100mA power drain. This enables compatibility with:
Android based devices

• iOS devices
• macOS Computers
• Windows 7-11 PCs
• Digital Audio Players with USB Audio Output

Bundled Protective Case

RU7 includes a supple handmade leather case custom made to fit the device. Included with the case are two discreet magnets with adhesive that you can use to attach RU7 securely to your car, phone, or anywhere else that you use it regularly.

Specifications

• DAC: Fully Balanced 1-Bit Resistor DAC
• Headphone/Line Output: 3.5mm SE, 4.4mm BAL
• 3.5mm Headphone Output:
  • Power: 160mW @ 32 ohms
  • THD: 0.006% @ 1kHz/1V
  • SNR: 114dB
  • Channel Separation: 76dB
• 4.4mm Headphone Output:
  • Power: 400mW @ 32 ohms
  • THD: 0.02% @ 1kHz
  • SNR: 112dB
  • Channel Separation: 92dB
• 3.5mm Line Output
  • Power: 1.2Vrms Fixed
  • THD: 0.02% @ 1kHz
  • SNR: 112dB
  • Channel Separation: 100dB
• 4.4mm Line Output
  • Power: 2.4Vrms Fixed
  • THD: 0.02% @ 1kHz
  • SNR: 112dB
  • Channel Separation: 102dB
• Net Weight: .9 oz
• Cayin 1 year warranty

In the Box

• RU7 Portable DAC
• Leather Protective Case
  
• USB-C Cable x1
• User Manual