CAYIN RU6

Portable USB DAC/Head-Amp Dongle

Discrete 24-Bit R-2R Ladder Resistor

Network Explained

The basic idea of 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 the resistors that can

deliver extreme precision and remain stable during temperature changes.

Ultra Precision Low TCR Thin Film Resistor

NOS or OS Dual DA Mode

Discrete Volume Control

R-2R DAC circuit is very demanding on incoming data integrity,digital volume

of mobile phone will damage sound quality badly.

When off - the - shelf volume options cannot meet high precision, low noise,

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 transparant to maintain the natural sound

signature of R-2R DAC.

Intuitive and Versatile

Hardware volume buttons for convenient control, doubled as menu selection

when enter 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 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 intro amplification circuit.

Functional Diagram for RU6 R-2R Dongle

Low Power Consumption Highly Compatible

Discrete R-2R is a low-power DAC circuit when compare to other highly integrated DAC

shipset, minimised power drain from mobile source.

USB Audio with shielded interconnect USB-C interconnect, compatible with wide range of

mobile, consumer electronics and computers.

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 ...

Net weight around 28g only, it is small enough to slip into

your smallest pocket.

Supreme and Multifunctional

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