Specifications:

3.5mm

Power rating: 138mW@32Ω

Freq. response: 20Hz-20kHz (±0.5dB)

THD+N: 0.032% (1kHz, output: 0.5V)

Dynamic range: 109dB (20Hz-20kHz, A-Weighted)

SNR: 113dB (20Hz-20kHz, A-Weighted)

Output impedance: 0.5Ω

4.4mm

Power rating: 213mW@32Ω

Freq. response: 20Hz-20kHz (±0.5dB)

THD+N: 0.04% (1kHz, output: 1V)

Dynamic range: 110dB (20Hz-20kHz, A-Weighted)

SNR: 114dB (20Hz-20kHz, A-Weighted)

Output impedance: 1.0Ω

Other

Headphone: 3.5mm + 4.4mm Balanced

DAC: 24bit Discrete R-2R

USB: USB Audio Input

Display: 0.96 inches 128x64 OLED

Digital decoding: PCM: 44.1kHz ~ 384kHz

DSD: DSD64/128/256

Control: Volume +/-, Mode

Accessories: USB Type-C to C cable (shielded), USB A to C adapter

Physical

Dimension: 65mm x 25.4mm x 13.7mm

Material: Chassis CNC Aluminum

Net weight: ~28g

Features:

 - 24-Bit Discrete R-2R Resistor Ladder DAC

 - User Selectable NOSIOS DA Modes

 - High Precision Resistor Array Volume control

 - DSD256

 - PCM 384kHz

 - Type C USB Audio

 - 4.4mm Phone Out

 - CNC Chassis

 - 65x25.4x13.7 (mm)

THE DISCRETE 24-BIT R-2R LADDER RESISTOR NETWORK EXPLAINED

The basic idea of an R-2R ladder is a matched pair of two resistors, the first is “ R ” and the other is “ 2R ” which has twice the value of R.

To achieve 24bit R-2R decoding, we need 48 pieces of resistors (23xR and 25x2R) for one channel or 96 pieces of high-precision resistors for stereo.

R-2R is famous for its natural and realistic sound signature, it’ll offer a very different experience to music lovers.

To achieve 24-bit R-2R decoding, Cayin searches for resistors that can deliver extreme precision and remain stable during temperature changes.

ULTRA PRECISION LOW TCR THIN FILM RESISTOR

0.1% 1/1,000 ultra high precision

TCR25 25 ppm/°C low-temperature coefficient of resistance

NOS OR OS DUAL DA MODE

 - Non-Oversampling

Maintain the original sampling rate of the source bitstream;

Digital filter-less, no post-processing, optimized in the time domain, low phase improves anti-aliasing, optimized in the time domain;

Distortion and jitter, no ringing artifact;

Musical with vivid emotions sounds natural, organic and coherent;

 - Oversampling

Increase sampling rate (upsampling) through interpolation before DA;

Enhances resolution, reduces noise and frequency domain;

Impressive details and frequency extension, clean and sharp presentation with a darker background;

DISCRETE VOLUME CONTROL

R-2R DAC circuit is very demanding on incoming data integrity, and the digital volume of mobile phones will damage sound quality badly.

When off-the-shelf volume options cannot meet the high precision, low noise, and low power consumption requirements of RU6, we developed our own discrete resistor array volume control.

0-99 steps volume control through 9 segments of resistors and switching relays*, meet all the RU6 requirements and transparent to maintain the natural sound signature of R-2R DAC.

*Switching the relay will introduce short delays in volume adjustment.

INTUITIVE AND VERSATILE

Hardware volume buttons for convenient control, doubled as menu selection when entering Mode settings. 

1” OLED screen displays playback information with good visibility.

3.5mm and 4.4mm phone out to fit your earphone collection.

ULTIMATE DUAL MAIN BOARDS LAYOUT

To minimize interference, RU6 circuitry is split into TWO 6-layer PCBs, with digital and analogue circuits installed in separate boards.

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

LOW-POWER CONSUMPTION IS HIGHLY COMPATIBLE

Discrete R-2R is a low-power DAC circuit when compared to other highly integrated DAC chipsets, with minimised power drain from a mobile source.

USB Audio with shielded interconnects USB Type-C interconnect, compatible with a wide range of mobile, consumer electronics and computers.

RU6 is compatible with the following digital audio sources:

iOS and iPadOS; macOS computers; Windows 7/8/8.1/10 computers*; Android mobiles and tablets; Digital Audio Players**

NOTE:

- Requires to install a proprietary USB Audio 2.0 driver developed for RU6

* - Requires USB Audio output support from the Digital Audio Player. 

HIGH-RESOLUTION AND HIGH-FIDELITY

High-end digital audio capability.

• PCM: supports up to 384kHz

• DSD: supports DSD64/128/256

Choice of High/Low gain to enhance performance with different IEM or portable friendly headphones.

NOT THE SMALLEST BUT SMALL ENOUGH

Net weight around 28g only, it is compact, small enough to slip into your smallest pocket.

SUPREME AND MULTIFUNCTIONAL

Music, video, gaming...you name it, we do it.