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R-27 MK2

Truly balanced fully discrete r2r ladder DAC,
Truly balanced fully discrete headamp/preamp,
ultimate all in one unit

 

    

      

   

Note: The manufacturing process and design can be updated and upgraded at any time so internal and external changes to the actual product can occur without notification.
 

Summarize Use Manual Specs Custom Option Shipping Cost

Please note:
       
 This product applies the latest power technology. Therefore the working temperature has dropped significantly compared to the previous generation products. This allows leaving power on over the long term.
        This product is burned-in for at least 300 hours before shipping.
        We recommend burning it for an additional 300 hours for best results.
        The quickest way to complete the burn-in of this product is to play music continuously.
        Do not immediately power on the unit after powering it off. Wait for at least 30 seconds.


Normal working state display:

Leftmost digit on top:
         Input channel indicator, either 1,2,3,4,5, 6 or 7 ( for details, please read below ). If update the EC firmware to allow external 10 MHz clock input, when the clock connected, the right bottom of this digit will light up a dot, that can go into the setting menu to set the DAC work with external clock.( for details, read below ).
2nd and 3rd digits on top:
       
 Volume control number , from 00 to 99 range.
Leftmost digit on bottom:
        
Output channel indicator, H mean for headphone output , P mean for preamp output ,D mean for DAC output.
2nd digit on bottom:
        
Gain indicator. H mean high gain 26DB, L mean low gain 13DB. (High gain design not recommend connect the in-ear headphone.)
The remaining digits on bottom:
         Input signal sampling rate indicator; 44.1, 48.0,88.2, 96.0, 176, 192, 352 and 384 are for the PCM formats, while 064, 128, 256 and 512 are for the DSD formats. While with the IN7 XLR input, there is no sampling display.

        
The display can swap the sampling display on top , input channel and volume display on bottom. ( for details, read below ).
        

Button functions:

Left button: (Only available while user want to change the set  feature .)

        Push the left button once, the leftmost digit of bottom will blink, which indicates it is selected. This allows changing the corresponding setting. Push the right button to select the desired value. While the display is still blinking, push left button again , the next digit to the right will be selected and blink.
         While the rightmost digit of bottom is blinking, push the left button one time, the menu will change to page 2. While the rightmost digit of the page 2 is blinking, push the left button one time, quite the set menu and back to the normal state.

Right button: (Mulriple functions.)
         While the display is in normal state (not blinking), it allows selecting the input source in decreasing order. One of the following will be displayed:
"1 - AES", for the AES/EBU digital input;
"2 - BNC", for the BNC coaxial digital input; (If update the EC  firmware, the 2-BNC is for the external clock input .The external clock output impedance must be 75 ohms, the supported output level range is 0.7-3.0V and a 75-ohm BNC cable must be used.)
"3 - RCA", for the RCA coaxial digital input;
"4 - OPT", for the optical digital input; (For the best sound quality , R-27HE optical input sensitivity rigorous follow the worldwide standard, it may can't work well with some models TV, TV box or game box  optical outputs if weaker than standard.)
"5 - IIS", for the HDMI-IIS digital input; (The HDMI-IIS need the source HDMI-IIS output has the same pin definitions for compatible and work. It can't work with the TV or computer standard HDMI output .)
"6 - USB", for the USB digital input. (For Windows , the computer must install the driver for recognize the device. Mac, Linux, IOS and Android don't need driver install.)
"7 - XLR", for the analog input.
         While the display is blinking, the right button for set the menu value for change the setting.

Knob:
         For change the volume .


Setting values
Menu Page 1:

The leftmost digit on bottom: Output channel select
       
H mean for headphone output ,
         P mean for preamp output (with volume control),
         D mean for DAC output (Fixed output level without volume control).

The second digit from the left  on bottom: Gain select.
       
H mean high gain 26DB.
        L mean low gain 13DB.

The 3rd and 4th digit on bottom: OS and NOS mode select.
       
While working under oversampling (OS) mode, the lower the oversampling level is, the warmer the sound will be. While working under non-oversampling (NOS) mode , the sound even more warmer and smoother. The possible values are:
        N0 : New NOS mode.
        N1 : Basic NOS mode.
        O2 : 2X oversampling
        O4 : 4X oversampling
        O8 : 8X oversampling

The 5th digit on bottom: The DAC and Preamp output select for the rear outputs.
        P : The rear output ports with volume control .
        2 : The rear output ports with 2V RMS DAC output level (XLR).
        3 : The rear output ports with 3V RMS DAC output level (XLR).
       
4 : The rear output ports with 4V RMS DAC output level (XLR).
       
5 : The rear output ports with 5V RMS DAC output level (XLR).

 Please note:      
         The RCA output has a half output level of the XLR.
         The headphone output always with the volume control.
         The input 7 XLR always has volume control.

Menu Page 2:

The leftmost digit on bottom: External clock select
       
I (Internal) : Selects the internal clock
        E (External) : Selects the external clock
        The external clock selection is only possible after a successful clock connection is made, otherwise the display will show "Fail" on an attempt to select it.

The 2nd digit
on bottom: Simulates the sound of a turnable
        S (Simulate) : Activate the phono simulation feature, and we recommend to set the DAC on OS2, NOS0 or NOS1 mode for best results.
        n (Non-Simulate) : Disable the phono simulation.

The 3rd digit
on bottom: Display auto-dimming setting
        D (Auto Dark) : Enables the display's auto-dimming; the display will dim 10 seconds after the buttons are left untouched, only keeping a LED bar lit to indicate the unit is turned on. As soon as a button is touched, the display will turn back on.
        L (Light) :  Disables the display's auto-dimming, the display will remain on at all time.

The 4th digit: Exchange the sampling display on bottom or top
        O (Original) : Channel select and volume on top, sampling on bottom.
        E (Exchange) : Channel select and volume on bottom, sampling on top.
   

        


HDMI definitions : (Apply HDMI transmit the IIS signal, the pin's definitions must exact same , and not promise compatible with other brands)

         Note that this product does not require the source MCLK signal but if present, it will simply be discarded.
 

Firmware update now features:


10-pin UPDATE PORT:
         To connect the Altera Blaster and proceed with an FPGA firmware update from Windows, using the Altera programming software. These updates are meant for upgrading the functionality and/or sound quality .
FPGA firmware download and update guide:
        http://www.audio-gd.com/Firmwaredownload.htm
UPDATE PORT switch :
        For updating the built-in Amanero module's firmware through the USB input.
Please note:
        Don't touch this switch when the product is powered on unless proceeding with an Amanero firmware update, underwise you will be forced to proceed with an actual update, as the firmware will have been erased.
Amanero firmware download and update guide:   
        http://www.audio-gd.com/Pro/dac/Amanero/AmaneroEN.htm

Please note:
       Some few customer feedback they accidentally touch the Amanero update button cause the firmware delete, Since 23rd. July 2021 , the product ship without connect the update button wire, if customer want to active the update button feature, simply push into the connect by self .
       If you know the update button can't touch when don't need update the Amanero firmware, you can ask we connect the wires before shipping.

     

 

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