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R-28

Fully Discrete R-2R Resistor Ladders DAC

Fully Discrete DSD Native decoder

Fully Balance Discrete Transistors Headamp And Preampamps

All In One

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

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Released in 1st July 2018
USB / HDMI Inputs Include

Built In 4 Groups DA-8 R-2R Modules

Built In FPGA Processor , Reject The Jitter
DSD , DXD Support From USB / HDMI
32bit / 384K Asynchronous Transfer Amanero Combo 384

Built In OCC , And Hi-End Parts

    



   

   

   
Summarize Use Manual Specs Custom Option Shipping Cost

Please not:
          The R-28 had built in fully dedicated discrete R-2R resistor ladders DA modules. Based on some users feedback from Audio-gd other's R-2R products, it need longer burn in time to achieve the best sound quality and performance.
          Even it had burn in over 100 hours before shipping , but we are advice customers burn in it more than another 500 hours.
          You can power on it with playing music but shut down the volume for quickly finished burn in if you are at home.
          The mini remote shipped without battery because the either DHL and EMS limit shipping by plane , customers want to buy one CR2025 battery and assemble in the remote.



Input mode: 
Push the button "Input" for select the input sources .
Input 1: HDMI-IIS input.
Input 2: USB input.
Input 3: Optical input.
Input 4: RCA - coaxial input.
Input 5: RCA analog input.
Input 6: XLR analog input.

Gain mode: 
Push the button "Gain", the display will show between " L, H, F" .

"L" mean the unit working on low gain (100 steps and 7DB).

"H" mean the unit working on high gain (100 steps and 17DB).
"F" mean the volume change faster (64 steps) , working on high gain (17DB) .

Output mode: 
Push the button "DAC/HP", the display will show between " P , H".

"P" mean the unit output from XLR / RCA / ACSS from rear. XLR and RCA can connect to two amps in same time.

"H" mean the unit output for headphones on front plate.

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The DAC/PREAMP output mode selector : 
Pull out , XLR / RCA /ACSS output as decent DAC. Push into , XLR / RCA /ACSS output as preamp .
Headphone output modes have not any effect by this selector .


The display auto dark : 
Push into the jumper is auto dark .Please operate the jumper while the unit power off .


Warmer sound setting : 
The unit had built in a lot setting in the FPGa for users select the best suite sound flavors but they only effect the digital input.
  Push into 4 pcs jumper for got the warmer sound flavor. It is effect for all inputs.

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Jumpers setting


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Note 1:    ON mean the jumper push on.
              OFF mean the jumper pull off.
              Please power off the unit while change the jumpers for avoid the chip damage by the static electric .
              For safe, user must pull off the AC power cable before take off the top cover.

Note 2:    If the HDMI input signal not enough good, ( it may cause by the source or the HDMI cable quality or the RF interrupt to the HDMI cable), the sound may had noise or distortion or no sound in some sampling, try to push into the jumper on S2 pins.

S1 without jumper (Working on overampling mode)

Jumpers Number

Jumper Setting

Functions describing

S3

Inactive (OFF)

Active (ON)

PLL setting

S2

Note 2

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 8X OS

4X OS

2X OS

NOS

The sound will become smoother and warmer while setting lower oversampling.Default setting in the 8X OS which is the best neutral sound.

S7  (OFF)  (ON)  (OFF)  (ON)

S6

 (OFF)

 (OFF)

 (ON)

 (ON)

S4

Reserved

S5

Reserved

S1 with jumper push into (Working on NOS mode)

Jumpers Number

Jumper Setting

Functions describing

S3

Inactive (OFF)

Active (ON)

PLL setting

S2

Note 2

S7

Reserved

S6

Reserved
@ Mode 1 Mode 2 Mode 3 Mode 3 Different sound flavors between different modes.

S4

 (ON)

 (OFF)  (ON)  (OFF)

S5

 (ON)

 (ON)  (OFF)  (OFF)

HDMI definitions :
Please note: Don't hot push / pull of the I2S cable. Any time must power off the units then push or pull the I2S cable.
Pin 1 :        SDATA -                     
Pin 2 :        GND                         
Pin 3 :       SDATA +                    
Pin 4 :       SCLK +                       
Pin 5 :       GND                         
Pin 6 :       SCLK -
Pin 7 :       LRCK -                        
Pin 8 :       GND                         
Pin 9 :       LRCK +
Pin 10:      MCLK +                     
Pin 11:      GND                         
Pin 12:      MCLK -
Pin 13:      NC                            
Pin 14:      NC                           
Pin 15:      NC
Pin 16:      NC                            
Pin 17:      GND                         
Pin 18:      NC
Pin 19:      Auto on control  ]Without function in this product.^

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