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R2R 11  (2019 Version)
Single Ended Discrete Ladder Headphone amp / DAC (DSD native / DXD / PCM)

NOS design with R-2R resistor ladders DAC+Headamp
Built in 2 groups DA-8 R-2R modules
Unique noise reject technology remove the artifacts
DSD , DXD support from USB 
Amanero Combo 384 USB interface
All parts soldering with silver tin All resistors are the KOA / Vishay, no upgrade options

R-28 (Edition 2019)

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).

4 distinctive types of  different algorithms in NOS mode, and 3 types of different oversampling modes.

have 7  different tonal characteristics can be selection by the buttons on front plate.

TWIN PULSE ISOBARIC

SPECIAL SILVER COPPER CABLE TO INCREASE THE DEFINITION OF THE DETAIL

R-1 

FULL UPGRADE (ACCUSILLICON*2, CRYSTEC*2)

Fully Discrete R-2R Resistor Ladders DAC

Fully Discrete DSD Native decoder

Fully Discrete Real Balance  Current Transmit Design

All Digital Settings By Buttons On Front Plate (Don't want open the chasis).

4 type different algorithm NOS modes, and 3 types different oversampling modes,

have 7 type different sound features, 

Can be selection by the buttons on front plate.