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R-28  
(2021 Version)

Fully Balance Discrete Transistors Headamp And Preampamps
All In One

Built in real balanced headphone amp max output power achieve 9500 mW that can drive most headphone easy.

 8 group fully discrete R-2R DA modules to combine into real balanced push/pull decoders.

4 group fully discrete real balanced DSD native decoders.

Fully discrete real balanced  current transmition design.

2 pc ultra high frequency 90/98 MHz Accusilicon 318B femtosecond clocks provide synchronous clock for whole unit without PLL up-frequency .

32bit / PCM384K /DSD512 asynchronous transfer Amanero 384 apply the FPGA synchronous clock.

The whole digital circuit built with 1 pc FPGA and 5 pc CPLD programmable chipsets to separate the different configured circuits for avoid interrupt, data process in parallel mode.

Support firmware update to improve on sound quality.

All digital process mode settings accessible by buttons on front  (No need  to open the chassis).
 

 

             
Please note: The product improve cause the inside or outside change without inform .
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" .

"L" mean the unit working on low gain (100 steps and 12DB).

"H" mean the unit working on high gain (100 steps and 22DB).
We have
applied the new gain technology ,no any switches,relays or parameter of the amp change while change the gain modes so the sound quality is exact same in different gain modes. Users just want to choice the better mode for easy adjust the volume level.



Output mode: 
Push the button "OUT", 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.

 

The DAC/PREAMP output mode selector : 
Pull out , XLR / RCA /ACSS output as decent DAC, in this mode, the display show "d" instead "P" and the volume number show "--" ,the volume can not adjust anymore (The headphone output mode has not effect).
Push into , XLR / RCA /ACSS output as preamp .
Headphone output mode has not any effect by this selector .


 

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 inputs.
Push into 4 pcs jumper for got the warmer sound flavor. It is effect for all inputs.

 


Function introduce :

         The DAC can setting the digital process functions on front plate to change the sound flavors, without open the unit .


        
 

How to active the digital setting mode:
         The "OUT" and "Input" buttons has dual functions.
         While the input between input 5 and input 6, the "OUT" button can select the output mode between "H" (Headphone output) and "P" (Preamp output) .
         While the input is between 1 to 4, the "OUT" button become dual functions.
         In case, push the "OUT" button one time, the left first display flashing around 3 seconds, in term if the "OUT" button has not push again, the output mode change either "H" or "P".
         If the "OUT" button push again while the left first display flashing, the unit go into the digital setting mode.


OUT button :
         
While the unit had went into the digital setting mode, the one digit display will blink for active the function setting , push the "Input" button can change function .
         While the display blink, push "
OUT" again , the right next one digit display will blink for setting .

Left 1st display : Oversampling 
         "O" for select oversampling, "N" for select NOS mode.

Left 2nd display : OS and NOS modes
        
 While OS setting on "O" mean the DAC working under oversampling mode, lower number OS modes sound became warmer and smoother. Or depend on your sense .
         Mode "0" : class technology NOS mode.
         Mode "2" : 2X oversampling.
         Mode "4" : 4X oversampling .
         Mode "8" : 8X oversampling.

         While OS setting on "N" mean the DAC working under NOS mode, it has one mode now, it is the full new NOS configure design.


Left 3rd display : (Simulate SAA7220 +TDA1541A sound) :
          
Active (1) : Simulate SAA7220 +TDA1541A, digital attenuation low to -55DB, was -130DB. Bitwide low to 16bit , was 24 bit. While active this function, I are advice setting to OS2 or OS4 mode. But infact, this function can working with any setting mode.
 

Left 4th. display :  ( Dith)
         
Active (1) or Disable (0)  dither for all inputs.


Left 5th. display : Display
         Active (1)  the display auto dark, the display will become dark in around 10 seconds after stop operate any buttons . Disable (0) the display auto dark, the display  light always.

"Input" button:
          
While the display non blink, for select the input sources.
          While the display blink, for setting the digital process functions.

 

       
HDMI definitions : (Compatible with PS audio standard)

This product don't need the source MCLK signal but even the source has MLCK output but has not effect .

 


 

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