Cayin RU7 Portable DAC AMP

Fully Balanced Resistor Networks Discrete 1-Bit DAC for DSD Format

Purposively designed micro-miniaturized 1-bit DAC circuit from discrete components

Convert digital signal to analogue signal through a fully differentiate 4-ch DAC architecture.

The 1-Bit DAC circuit is a resistor network composed of 128 pcs (4 ×32) high precision Thin Film Resistors, this is closely resemble to the discrete DAC of our N7 DAP

The output of the resistor network will go through a 3-level active LPF and then converted to single-ended signal for volume adjustment.

High Power Parallel Phone Amplifiers

Dual amplifiers in parallel, providing 4-CH high power Balanced Driven output

The second phone amplifier is a parallel unity gain inverting phase amplifier.

An impressive upgrade in phone output power :

• 3.5mm SE, 160mW @322

• 4.4mm BAL, 400mW @328

Shared Line Out Conveniently Connected

The shared line out function will configure the 3.5mm or 4.4mm phone output into fixed voltage output (bypassing volume control):

• 3.5mm Single-ended, 1.2Vrms

• 4.4mm Balanced, 2.4 Vrms

The line out voltage are carefully selected to retain as much details and dynamic of the 1-Bit DAC with minimum noise and distortion.

Enable you to connect the RU7 to portable/desktop amplifier or home audio system and used it as an miniature 1-Bit DAC

Discrete Volume Control

Discrete Resistor Network DAC circuit is very demanding on incoming data integrity, we recommend users to keep the digital volume of mobile phone at full output to safeguard the quality of audio digital signal.

When off-the-shelf analog volume options cannot meet high precision, low noise, low power consumption requirement of RU7, we developed our own discrete resistor network volume control.

100 steps volume control through 3 segments of resistors and switching relays *, offer precise control over a wide volume range satisfy even the need of most sensitive IEM users:

• Segment 1: 1-49

• Segment 2: 50-79

• Segment 3: 80-100

Outstanding Digital Audio Capability with User Selectable All-to-DSD

RU7 supports PCM up to 384kHz and native DSD from DSD64 to DSD256.

Its Audio Bridge will receive different audio format and go through high precision signal enhancement.

All digital audio signal will convert to designated DSD format

(DSD64/DSD128/DSD256) before feeding to the discrete 1-bit DAC circuit.

Dual PCB to Minimise Interference

To minimize interference, RU6 circuitry is splited into TWO 6-layers PCB, with digital and analog circuit installed in seperate boards

Safeguard signal integrity, make sure the noise from reference clock and DSP will not bleed into amplification circuit.

Low Power Consumption Compatible with Common Platforms

Discrete resistor network is a low-power DAC circuit when compare to other highly integrated DAC chipset, minimise power drain from mobile source.

Redesigned amplification circuit increase output power dramatically while maintains the overall power drain at 100-110mA

Low power consumption allows RU7 compatibles with the following digital audio sources:

• Android based mobile devices

• iOS and iPad OS mobile devices

• macOS computers

• Window 7/8/8.1/10 computers

• Digital Audio Players with USB Audio output

Bundled Protective Case

Soft and tender handmade magnetic leather case

Custom make for RU7, precise cutout offers tight-fit protection and elegant presentation

Two circular metal plate with adhesive tape pad are included.

A Compact and Nimble Powerhouse

Weight: 25g

Dimension: 66*24*12 mm

Includes:

• RU7 Dongle DAC x1

• Type-C cable ×1

• USB A to C adapter x1

• User Manual ×1

• RU7 Protective Case x1