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R-27
DAC+Headamp+Preamp all in one, can work as decent DAC / headamp / preamp
Built in R-8 DAC
Built in Master 9 Pure class A headamp/Preamp
 

Built in real balanced pure class A headamp & preamp
Pure class A power 9000mW@40ohm
Dual gain modes can drive high/low sensitivity headphones
Built In 4 Group DA-7 V2 Modules

Built In FPGA Processor to Reject Jitter 
USB / HDMI support DSD native and DXD



  

 

   
Summarize Use Manual Specs Custom Option Shipping Cost

Please not:
          The unit had built in fully dedicated discrete R-2R resistor ladders DA modules. So 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: RCA - SPDIF input.
Input 2: Optical input.
Input 3: HDMI-IIS input.
Input 4: USB input.
Input 5: XLR analog input.
Input 6: RCA analog input.

Gain mode: 
          We have
applied wide area volume control system and 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.
         
H mean High gain, and L mean Low gain. The Low gain is 12DB, match with the headphone with over 95DB sensitivity . High gain is 22DB, match with the headphone with less than 95DB sensitivity, even the HE6 , it can be drive fully .
         Below diagram show the volume and gain rate to the output voltage .


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. (If setting the rear outputs on DAC mode, in case it displays "d" instead .

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

 


Function introduce :

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

        

 

How to active the digital setting mode:
         While user going to change the setting function, we advice user shut the volume and stop the music source playing.
The function of the "Setting" button:
         Push the "Setting" button one times, the one digital of the display will blinking, the blinking digital mean that can be change the setting.
         While the display blinking, push the "Setting" button again, the next right one digital will blinking, it mean that can be change the setting. While the right first digital blinking and push the "Setting" button again, the display will go into the 2nd setting menu  .
The function of the "Left INPUT" button:
         While the display blinking, push the "Left INPUT" button, the next left one digital will blinking, it mean that can  be change the setting.
The function of the "Right INPUT" button:
         While the display blinking, push the "Right INPUT" button, the blinking digital will change the state, it mean that setting had changed.
         In the setting mode, 5 second later without any button push, the display stop blink and back to the normal display mode. User can start play the music and turn the volume up.

         The below diagram show the two page menus and the functions:



1st page setting menu

1st display : OS/ NOS
         "O" for select oversampling, "N" for select NOS mode.

2nd display : Mode of OS/ NOS
        
 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.


3rd display : TDA (Simulate SAA7220 +TDA1541A sound) :
          
Active (1) : Simulate TDA1541A sounding,  While active this function, and set toOS0 or OS2 or OS4 mode, simulate SAA7220+TDA1541A sounding . In fact, this function can working with any setting mode and bring the different sound flavor.

4th display : Gain
          
H mean High gain, and L mean Low gain. The Low gain is 12DB, match with the headphone with over 95DB sensitivity . High gain is 22DB, match with the headphone with less than 95DB sensitivity, even the HE6 , it can be drive fully .

2nd page setting menu

1st display : DAC/PRE (Select the rear output state)
           "d" mean the XLR/RCA/ACSS outputs on rear set to DAC mode, in case the volume control had disable. (The headphone output always has volume control ).
           'P" mean the XLR/RCA/ACSS outputs on rear set to preamp mode, the volume control available.

2nd display : Dark

         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.

3rd display :
 SYN (Syn version for correct HDMI data, Asy version for Dith)
         
Syn version : If the HDMI input had noise, distortion or some samplings no sound, user can setting the 1st number ON (1) or OFF (0) to fixed the issue. In default is OFF (0) .
         Asy version :
Active (1) or Disable (0)  dither for all inputs. The unit default had built in Asy firmware.

4th display :  Remote
         
This is mean the remote function setting, if it set to 0, whether long or short push the remote controller volume button, the unit volume only change 1 step . If set to 1, push and hold the remote controller volume button, the unit volume change continuously .In case if set to 1 but the unit had control by other devices , set to 0 please.

Setting examples:

1,Set to most neutral sound mode (8x oversampling, non TDA mode):
          
Push the "SETTING" button one times, the 1st digital of the 1st menu blinking, then push the "Right INPUT"  set it to "0" , then push  the "SETTING" button one times, ,the 2nd digital blinking, push the "Right INPUT" set it to "8", then push  the "SETTING" button one times, ,the 3rd digital blinking, push the "Right INPUT" set it to "0" .
2,Set to TDA1541 Simulate mode:
          
Push the "SETTING" button one times, the 1st digital of the 1st menu blinking, then push the "Right INPUT"  set it to "0" , then push  the "SETTING" button one times, the 2nd digital blinking, push the "Right INPUT" set it to "0" or "2" or "4" (the number lower sound is more warmer and smoother), then push  the "SETTING" button one times, ,the 3rd digital blinking, push the "Right INPUT" set it to "1" .
3,Set to NOS mode (New configure NOS mode with simulate TDA mode for the one of the most warm and smooth sounding):
          
Push the "SETTING" button one times, the 1st digital of the 1st menu blinking, then push the "Right INPUT"  set it to "N" , then push  the "SETTING" button two times ,the 3rd digital blinking, push the "Right INPUT" set it to "1" .
4,Set to High Gain mode:
          
Push the "SETTING" button one times, the 4th digital blinking, then push the "Right INPUT" button set to "H" .

5,Set to DAC output mode :
          
Push the "SETTING" button one times, the 4th digital blinking, then push the "SETTING" button one times, the 1st digital of the 2nd menu blinking, push the "Right INPUT" set to "d".

6,Set to remote volume continued control mode:
          
Push the "SETTING" button one times, the 1st digital of the 1st menu blinking, then push the "Left INPUT" button one times, the 4th digital of the 2nd menu blinking, push the "Right INPUT" button set to "1".

       
HDMI definitions : (Compatible with PS audio standard)
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:      NC    (Syn version still need the Mclk+ on this pin)           
Pin 11:      GND                         
Pin 12:      NC    (Syn version still need the Mclk- on this pin)   
Pin 13:      NC                            
Pin 14:      NC                           
Pin 15:      NC
Pin 16:      NC                            
Pin 17:      GND                         
Pin 18:      NC
Pin 19:      NC
R27_tda_Asy don't need MLCK input . Even the source has MLCK output but has not effect .
In default the unit built in R27_tda_Asy firmware.
If user's source HDMI definition is different, can send us the definition ask the custom order. But in some few cases even though the definition has same but still can not compatible because the voltage character is different.



R27_tda_Asy and R27_tda_Syn firmwares available

What's the different between R27_tda_Asy and R27_tda_Syn:
       R27_tda_Asy is the firmware  running in asynchronous mode, after update it can without input the Mclk signal from HDMI-IIS input, regenerative inside by the Accusilicon clocks.
       R27_tda_Syn is the firmware running in synchronous  mode, it still need the Mclk signal from HDMI-IIS input.
        Some users may don't concern the technology different, they just concern the sound and they know the technology advantage don't mean the sound better .
       In the simple, you can consider R27_tda_Asy is the Accurate version and the R27_tda_Syn is the Smooth version.

Firmware update guide:
    
R8 update guide (R27 update guide is same as R8)


 

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