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R-28 (Edition 2020)

Fully Discrete R-2R Resistor Ladders decoder

Fully Discrete DSD Native decoder

Fully Balance Discrete Transistors Headamp And Preampamps

All In One

Chassis Size 360*360*85 MM (W*D*H)

All Digital Settings accessible By Buttons On Front Plate (No need to open the chasis).


Built In 4 Groups of  DA-8 V2 Modules
Built In FPGA Processor to Reject Jitter 
DSD , DXD 32bit / 384K Support From USB / HDMI
Built in real balanced headphone amp.
Built with OCC and Hi-end parts



Summarize Use Manual Specs Custom Option Shipping Cost

Specifications tested by OS8 mode and already through sound tuned, we always improve for better real like , musical and analog sound ,
improvement may result in changes in specifications and
design without notice.
S/N Ratio

THD+N @ 1KHz
<0.02% (Full Scale )

THD+N @ 20Hz-20KHz
<0.04% (Full Scale )


L mode : +7DB
H mode : +17DB

Volume characteristic

Channels imbalance
< 0.05DB
Frequency Breadth
20Hz - 20KHz  (< - 0.5DB)
 Output Level
 Headphone output : 19V RMS  (balance)

Preamp Variable output : 19V RMS (balance)

DAC Fixed output : 5 V RMS (balance)
Headphone amp output power level
(Only for  headphone over 15 ohms.)

Balanced mode

9500mW / 25 ohm
8000MW / 40 ohm
 3500MW / 100 ohm
1200MW / 300 ohm
600MW / 600 ohm


Output impedance
1 ohm /  Headphone output

5 ohm / DAC / Preamp output
Input Sensitivity
0.5 Vp-p(75 Ohms, Coaxial)
19 dBm (Optical)
Support Operate Systems (USB)
Windows, OSX, Linux, ISO
Support Sampling  
USB & IIS : 44.1kHz - 384kHz /32Bit DSD64-512
 Coaxial mode: 44.1kHz - 192kHz
Optical mode: 44.1kHz - 96kHz
Power Requirement
1 Version  100-120V  AC 50/60 Hz

2 Version  220-240V  AC 50/60 Hz
Power Consumption
Package Weight
Approximately 8.5KG

W360 X L360 X H85(MM, Fully aluminium ) 
AC power cord            X1
USB cable X1



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