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Built in 4 groups DA-7 V2 modules
Built in FPGA processor , reject the jitter 
DSD , DXD support from USB / HDMI
32bit / 384K Asynchronous Transfer Amanero Combo 384 with USB isolator and separate PSU power supply
Built in OCC , Femtosecond TCXOs and Hi-End parts




Summarize Use Manual Specs Custom Option Shipping Cost
Please note:
        The product even had burn in over 300 hours before shipping
        You can power on it with playing music if you are at home for quickly finished burn in. If you don't want listen music during the burn in term, you can turn the amp volume to minimum.
        The product had the pure class A analog amps and PSUs design, we are not recommend stack other products on its top directly, it need least 3CM room on its top side. Also we are not recommend stack it on the top of other hot products , it should place on the shelf .
        Please power off before connect or disconnect the inputs and outputs .
        Power on the product must had more than the half minute after last power off .

R7_tda firmwares Function introduce :

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

          Since 20th. Mar. 2019 the unit built in tda_asy firmware. The older  V3 firmware function introduce please click to read it

           R7_V3 firmwares function introduce.


Important warn:
         Before push the
"Setting" button, I are advice user turn  low  the amp volume, stop the music track playing .
         Because for the aim to reproduce the best sound quality, the DAC without mute design , change the setting may output circuit switch sound .
         Around 5 seconds after non any button had push, the display stop blink, user can click the music track to playing and  turn up the volume.

Setting button :
Push the "Setting" button one time, the one digit display will blink for active the function setting , push the right "Selector" button can change function . While the display blink, push "Setting" again , the right next one digit display will blink , push the left "Selector" button the left next one digit display will blink .
         While the "Dis" LED blink, push the "Setting" one time , the menu will change to menu page 2.

Left Selector buttons:
While the display non blink, for select the input sources.
          While the display blink, for the setting digit move one left.

Right Selector buttons:
While the display non blink, for select the input sources.
          While the display blink, for setting the digital process functions.

Menu Page 1:

OS (Oversampling) :
         "O" for select oversampling, "N" for select NOS mode.

Mode ( OS and NOS modes):
 While OS setting on "O" mean the DAC working under oversampling mode, loIr 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.

Dith  (Dither) :
Active (1) or Disable (0)  dither for all inputs.

Pll  (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.

Di (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.

Menu Page 2:

1st number  (non function in the Asy version) :
For the 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) .

2nd number  (non function in the Asy version) :
For the Syn version if user want to replace other brands USB module in the unit, user can setting the 2nd number ON (1) or OFF (0) to find the best match .In default is OFF (0) .


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
R7_tda_Asy don't need MLCK input . Even the source has MLCK output but has not effect .

R7_tda_Asy and R7_tda_Syn firmwares   (Support up to 768K at NOS mode)
What's the different between R7_tda_Asy and R7_tda_Syn:
       R7_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.
       R7_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 R7_tda_Asy is the Accurate version and the R7_tda_Syn is the Smooth

Upgrade Port :
The DAC can through an USB cable connect betIen computer and "Upgrade Port" to upgrade the firmware for improve the sound quality or performance .

Firmware update guide:
R7 update guide




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