Cayin RU6 Portable USB DAC Headphone Amplifier
£189 £159

Features
- 24-Bit Discrete R-2R Resistor Ladder DAC
- User Selectable NOS/OS Digital to Analog Modes
- High Precision Resistor Array Volume Control
- Dual Main Boards Layout
- DSD256 and PCM 384kHz
In the Box
- Cayin RU6 R-2R USB DAC / Headphone Amplifier
- USB C to USB C Cable (Shielded)
- USB A to USB C Adapter

Specifications
Product Information | |
---|---|
DAC | 24bit Discrete R-2R |
USB | Type C USB Audio Input |
Digital Decoding | |
PCM | 44.1kHz ~ 384kH6z |
DSD | DSD64/128/256 |
Control | Volume +/-, Mode |
Chassis | CNC Aluminum |
Headphone | 3.5mm + 4.4mm Balanced |
Accssories | USB C to C cable (shielded), USB A to C adapter |
Dimension | 65mm x 25.4mm x 13.7mm |
Net Weight | ~28g |
RU6 Headphone Output (OS Mode) | |
3.5mm | |
Power rating | 138mW@32Ω |
Freq. Response | 20Hz-20kHz (±0.5dB) |
THD+N | 0.032% (1kHz, Output|0.5V) |
Dynamic Range | 109dB (20 Hz-20kHz, A-Weighted) |
SNR | 113dB (20 Hz-20kHz, A-Weighted) |
Output Impedance | 0.5Ω |
4.4mm | |
Power rating | 213@32Ω |
Freq. Response | 20Hz-20kHz (±0.5dB) |
THD+N | 0.04 (1kHz, Output|0.5V) |
Dynamic Range | 110 (20 Hz-20kHz, A-Weighted) |
SNR | 114dB (20 Hz-20kHz, A-Weighted) |
Output Impedance | 1.0Ω |

Description
RU6 Portable USB DAC Headphone Amplifier
Cayin RU6 Portable USB DAC /Headphone-Amp Dongle featuring a 24-bit Discrete R-2R Resistor Ladder DAC, user Selectable NOS/OS Digital to Analog Mode and High Precision Resistor Array Volume Control supporting DSD256 and up to PCM 384kHz.
Cayin RU6 USB DAC Headphone Amplifier has 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, Cayin needs 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.
NOS or OS Dual DA Mode
Non-Oversampling:
- Maintain the original sampling rate of the source bitstream.
- Digital filterless, no post-processing, optimised in the time domain, low phase distortion and jitter, no ringing artefact.
- Musical with vivid emotions sounds natural, organic and coherent.
Oversampling:
- Increases sampling rate (upsampling) through interpolation before DA.
- Enhances resolution, reduces noise and improves anti-aliasing, optimised in the 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, low power consumption requirements of RU6, Cayin developed their 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.

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 phono out to fit your earphone collection.
Ultimate Dual Main Boards Layout
- To minimise 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 Highly Compatible
Discrete R-2R is a low-power DAC circuit when compared to other highly integrated DAC chipsets on the market, minimising power drain from mobile sources.
USB Audio with shielded USB-C connector, compatible with a wide range of mobile, consumer electronics and computers.
High Resolution and High Fidelity
High-end digital audio compatibility.
- 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.

Additional information
Colour | Black |
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Warranty
Backed with a 1-year Cayin warranty
Delivery Info
Delivery Information
As a company our primary goal is to provide a seamless service that results in customer satisfaction. We aim to deliver within 3 working days. Unfortunately, there may be occasions where this time frame may not be met due to unforeseen circumstances; in this instance, we deliver product/s as soon as we can. All delivery charges are included within the prices quoted, unless otherwise specified.
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