Discrete  DAC+ Headphone amplifier / Preamplifier
Built in Sabre ES9038  Pro  
DSD , DXD,32bit / 384K  support from USB
A femtosecond TCXO built in

Discrete  DAC+ Headphone amplifier / Preamplifier
With XLR / RCA analog inputs
built in Sabre ES9038Pro
DSD , DXD 32bit / 384K Support From USB / HDMI
9500mW at 40 ohm ( per channels )
Built with OCC and Hi-end parts

Discrete  DAC+ Headphone amplifier / Preamplifier
DSD , DXD support from USB
32bit / 384K Sabre ES9028  Pro  
32bit / 384K Asynchronous Amanero

Built In FPGA Processor to Reject Jitter 
Dual Sabre ES9038Pro
DSD , DXD 32bit / 384K Support From USB / HDMI
9000mW at 40 ohm (Pure Class A, per channels )
Built with OCC and Hi-end parts

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.

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