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Audio-GD NFB29.38 Discrete  DAC/Headphone amplifier/Preamplifier

    Audio-GD NFB29.38 Discrete DAC/Headphone amplifier/Preamplifier

    RM 3,923.58

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    Product ID : 204149693 Brand : Audio-GD Model / SKU : NFB-29.38 Conditions : New


    Audio-GD NFB29.38 Discrete  DAC/Headphone amplifier/Preamplifier

    KINDLY PM FOR LATEST STOCK AVAILABILITY BEFORE MAKING PAYMENT
     
    Hai Wei
     
    ** Facebook http://m.me/StarsPickerAudio
     
    ** WhatsApp https://goo.gl/GsPFak

    NFB-29.38 (ES9038Pro)

    The single ended version based on NFB-27
    Discrete  DAC+ Headphone amplifier + Preamplifier
    With 2 groups RCA  analog inputs
    DSD , DXD support from USB and I2S inputs
    32bit / 768K Sabre ES9038Pro
    32bit / 384K Asynchronous Transfer Amanero Combo 384
    Built in OCC and TCXO ,no upgrade options

     

         

       

     


    Amanero combo 384 Intruduce and driver download (For the unit with the Amanero Combo384 upgrade module)
    Audio-gd products had design and test based on the AP SYS-2722 (The top-drawer professional equipment in world) 



    Different to the NFB-28.38:
    The NFB-29 is a single ended DAC with headamp and preamp (+/- 30V DC high voltage power supply ), The NFB-28 is balance DAC with headamp and preamp (+/-15V DC power supply ).  So They had same output power specs can drive most headphone as well.
    If customer like to keep your headphone with single ended connector (6.3MM), choice the NFB-29H get better performance than the NFB-28.
    If customer had the balance connector headphone or can modify the headphone with balance connector, choice the NFB-28.

    Different to the  NFB-29(2017):
    Apple the newly designed ES9038Pro, built in Amanero Combo384, TCXO, OCC wires, the unit can't be upgrade any parts . It can auto detect the input signal DSD and remove the switch noise . In this design, the input signal had less signal journey feed to the ES9038Pro , improve on the sound quality .

    Summarize
    Multi-ply shield boards to isolation the power input socket , transformer, power supplies, digital part and the analog part .
    Fully Discrete design built by discrete analog stages without any OPA and coupling caps in the signal channels, built in  DAC, output for headphone (4-pin XLR or 1/4") and   preamp  output.
    Non- feedback ACSS analog output stage .
    The analogy amps working under +/- 30VDC for got the super well linear and offer high power output in single ended design.
    LED display avoids RF disturbance for better sound quality 
    Large R-core transformers and Hi-fi grade parts like DALE resistors, WIMA caps .
    Total of 6-group PSUs are used to purify the power supply , the analog amp has discrete PSU power supply 
    Two-channel digitally controlled relay-based volume control to avoid channel imbalance and improve sound quality. 
    100 steps volume control , it can working fine with high and low sensitivity headphones and speakers. 
    4 digital inputs:   USB / I2S /Optical / Coaxial RCA
    2 analog inputs:  RCA / RCA
    DAC output:   RCA / RCA / ACSS  (User can set either variable output level as preamp or fixed output level as dedicated DAC )
    Headphone output : 4 pin XLR / 1/4" (6.3MM) SE
    4 types gain modes , drive the high and low sensitivity headphones as easy .   
     


    Technology detail

    Detail of the Current Conveyor Technology

    Impedance matching:
                 The NFB-29 had two groups analogy RCA inputs ,can connect external DACs , working as a decent headphone amp .There are a lot different DACs in worth, they had different design and output impedance . For avoid the sound quality effect by different DAC's output impedance, in the NFB-29, it had design a pair single-ended class A FET buffers in the input . All the analogy RCA input signals through these FET buffers, the output impedance had become very low, even the source had high or low output impedance. 
                 The FET buffers working on pure class A state, and it is so short signal journey , it can keep the sound quality without coloration ,dry and harsh .
                  

     Simple and short signal transfer is best:
        
       The NFB-29 applies the newest ESS high-end Sabre32 DA chip ES9038Pro which can support up to 32Bit/384KHz input . 
           ES9038Pro in voltage output model , there is -12DB THD+N worst , to be achieve  the best performance of ES9038Pro , must work in current output model .
           In some other ES9038Pro built in DAC design , ES9038Pro output signal have to through 3 step OPAs implement analogy signal process .
           The NFB-29 had different design , applies Non-feedback ACSS design. The ES9038Pro feed to the ACSS circuit by balanced model without any OPAs .
           The ACSS circuit naturally working in current model and have design difference current input , it can transfer the ES9038Pro current signal to output and implement the I/V conversion in current model in one ACSS amp . And this ACSS amp only have one current gain stage , the ES9038Pro output signal only through one stage can arrive the output stages .
          The shortest signal journey can reproduce the best detail and dynamic, and almost without sound coloration , It can show the  real performance of the ES9038Pro .
           So our ACSS design is the best combo with ES9038Pro achieve the best performance .
                      Upside in the picture is the standard ES9038Pro headphone amp design. The bottom is the NFB-29 design .
                                                       

          

            The ACSS also is a non-feedback technology made with fully discrete amplifiers. Most people know the global feedback design can offer better specs in test measurements, and non-feedback can't do well in test measurements but can offer better sound for the human's ears. Here is a conflict of the classic circuits.
            But the ACSS opens a new field, it can offer a least coloration sound which is more neutral with very low distortion and high linearity. So it can retain the dynamics, detail and neutral sound but not sound bright or harsh.
            The output buffers are Non-feedback. For low impedance, we applied a diamond output stage which is quite less colored than most conventional circuits.
            The DAC is without couple caps to avoid coloration. There are two OPAs built in as the DC serve  to keep the DC offset .
            The 32bit / 384K USB interface outputs a I2S signal to ES9038Pro .  
                      Super low THD  (Test by AP SYS-2722,0DBV output level)                         Flat frequency response (Test by AP SYS-2722)
                                                                                               
     

    Strong diamond difference output stages:
                 The NFB-29 had design a pare diamond difference output stages, every parts had exact matching before assemble so don't need any human adjustment .  
                 The output stages working under + / -  30V DC power supplied, built in  two pair 15W transistors,  for offer strong drive ability , no matter drive the high and low sensitivity headphones  . The diamond different design can avoid switch distortion , it working as the class A but don't want large idle current .

                  


    Multi-ply   power supplies are the key of sound :

             NFB-29 applies the excellent DA chip ES9038Pro and excellent analog output stages, but these are not the only keys of the best sound. The power supply is most important. Even applying the best DA chip and the best amp, if matched to a average power supply, the total sound may still be average or sound musical but can't be neutral and detailed. That is why it is easy to find hi-end grade gears maybe without the best chips , but with plenteous dedicated DC supply circuits. 
             The NFB-29 uses A total of 6 groups  PSU power supply for all digital and analog circuits.
             To achieve high S/N, the control circuit is powered with separate regulator.


                     Strong power supply.
                     

     The I/V conversion volume control without sound degradation:

               Usually the volume control can be implemented in the DAC + amplifier combo in two methods
               Method 1: The volume control is implemented into the digital stage. The major drawback is that 1 bit of the D/A conversion is lost in every 6DB volume reduction. So, even though the built-in DA chip is 32 bit, in fact, only 16 bit may be left at low volume level.
               Method 2: The volume control is implemented in the analog amplifier input stage through a volume pot to reduce the signal level. However, the volume pot affects the sound quality adversely. A low grade volume pot loses the details and creates channels imbalance resulting into soundstage distortion. Even a high grade volume pot inevitably loses the details. Both methods degrade the sound quality. 
               The NFB-29 applies the I/V conversion volume control, the volume control is just a variable passive I/V conversion being placed at the ACSS amplifier output, where the output is current signal but not voltage signal. I/V conversion is to change the volume level from the current (I) signal to the voltage (V) signal. (Like R-2R D/A chips output passive I/V conversion) It can keep the signal frequency band flat while not losing any detail. It does not degrade the sound quality in every volume level. In front of the volume control, there are four groups of diamond non-feedback buffer output stages that offer very low output impedance.
                Mark Levinson also knows that current volume control has great benefits, so in the volume control of his top grade hi-end preamplifier No.32, he uses many components to change the voltage (V) signal to current signal (I), then through the R-2R network to control the volume, and finally changes back to voltage signal (V) again. NFB-29 simply works in current (I) signal domain, and technically, it is superior to the conventional technology due to less conversion.
                NFB-29 applies digitally controlled relay-based volume control in 100 steps. It has 90DB control range ( most other volume control only had around 70DB range, so the device want to design the gain switches ) allow users to control the volume level smoothly. NFB-29 has two relay-based volume control  channels through changing the DALE resistors to control the volume to avoid channel imbalance, achieving the best performance and sound quality of the gear. While change the volume, the combine relays break or close, it may had slightly switch sound on output and disappear while stop change the volume.

            Precise  digitally controlled relay-based volume control.            Fast / Slow two volume control characteristic

                                                              

    The Multi-ply shield boards  for avoid the interrupt:

               The NFB-29 had built in Multi-ply shield boards, to separate the  transformer, power supply, digital parts and analogy parts for avoid the different parts had disturb . Even though the power input IEC socket, it had hide in a copper shield box .

          
    Static storage mode control software:
               In most control softwares design, the MCU will continuously output data to the perform parts , the MCU had the very high speed, so the output data become high frequency impulses disturb the audio signal circuits make the sound worst . This product had applied static storage mode control software , the MCU output once control data and save in the perform parts while just power on and users operate ,then stop output data until users next operation. This design make the sound quality improve on the clear and transparency .

    Components:
               Uses all Hi-end grade components, including DALE resistors, WIMA caps, custom order NOVER (UK brand) caps, Neutrik headphone output socket, ect .


    Discontinued the analog idle input short circuit function:
             The unit  had design the analog idle input short circuit (In 5 and In 6) for avoid the disturb between different sources.
             This design also applied in a lot high end 
    brand devices.
             The working theory :  
    Without the idle input short circuit ,if the input 5 and input 6 had connect two extra DACs,  while users select the either input 5 and input 6 , the another input signal will fire through the circuits and mix  into the using signal, even though this signal is  weak  but still can degrade on the sound quality.
              With the idle input short circuit function : if user select either the input 5 and input 6, the another input signal will short circuit then no any signal fire through circuits , can keep the sound quality had not degrade.
           Below case users want to discontinued the idle input short circuit function, pull off the 4 jumpers as mark on the photo:
          1, The same extra source not only connect the 
    unit analog input, but connect with other amps simultaneity. 
          2, The same extra source connect to the 
    unit input 6 and input 5  at simultaneity.

               

    Click to review : RJ45 and HDMI pin definitions
            

    Gain button: 
    Select the Fast / Slow volume control characteristics.
            H: Fast.  64 steps range.   
            L: Slow. 100 steps range.
            F: (Full ) High gain mode. 
    100 steps range. (For the low sensitivity headphone like the HE-6 or the source had low output voltage level)
            S: (Super)High gain mode. 64 steps range. (For the low sensitivity headphone like the HE-6 or the source had low output voltage level)

    The button on rear : Pull out for the DAC / preamp without volume control , Push into for the DAC / Preamp with volume control. The headphone output always had the volume control. Please operate the button while the unit power off .

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


    DSD / PCM support from I2S input :
    The DSD/PCM support not only from the USB input, but the I2S input.   The NFB-29 can detect the I2S input signal, if input DSD signal, it will auto to remove the DSD pop noise while select the DSD track .




    Digital filter setting:
     
    IIR0 与IIR1:For DSD.
      IIR0 IIR1
    47K Push Into Push Into
    50K Pull Off Pull Off
    60K Pull Off Push Into
    70K Push Into Pull Off
    FIR0,FIR1,FIR2: For PCM.
       FIR_0  FIR_1 FIR_2
    Fast roll-off,  Linear: Push Into Push Into  Push Into
    Slow roll-off, Linear: Push Into Push Into Pull Off
    Fast roll-off, Minimum: Push Into Pull Off Push Into
    Slow roll-off, Minimum: Push Into Pull Off Pull Off
    Fast roll-off, Apodizing: Pull Off Push Into Push Into
    Fast roll-off, Hybrid: Pull Off Pull Off Push Into
    Brickwall filter: Pull Off Pull Off Pull Off
     

    Specifications might subject to change without prior notice for product improvement.

    S/N Ratio


    >120DB  
     


    THD
     
    <0.002% (0DBV output level )


    Output impedance
     

    2 ohm


    Output Level
     

     Headphone output : 19V RMS
    Preamp Variable output (balanced) : 10V RMS
    ACSS: 2MA

    Headphone amp output power level
    (Only for  headphone.)

    8000MW /  40 ohm 
     3500MW  /  100 ohm
    1200MW / 300 ohm
    600MW  /  600 ohm

    Digital Input Sensitivity

    0.5 Vp-p(75 Ohms, Coaxial)
    19 dBm (Optical)

    Analog Input Sensitivity
    0.7V RMS to 5V RMS 
     

    Gain
     
     +16DB

    Frequency Response

    20Hz - 20KHz (<-0DB)(DAC +AMP)


    Support Operate Systems (USB)
     

    Windows, Mac

    Support Sampling

     USB model: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz , 192kHz, 352.8kHz,384kHz
     Coaxial model: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz ,192kHz 
    Optical model: 44.1kHz, 48kHz, 88.2kHz, 96kHz

    Power Requirement

    Version 1: 100-120V  AC 50/60 Hz
    Version 2:  220-240V  AC 50/60 Hz

    Power Consumption

    31W

    Package Weight

    Approximately 5KG


    Dimensions
     

    Approximately W240 X L360 X H80 (MM, Fully aluminium ) 

    Accessories

    AC power cord            X1
    USB cable                X1
    Mini remote controller  X1

    Custom Options:
    1,  Replace the Amanero combo384 USB module by Xmos U208:
    2, 
    Custom order two pair RCA outputs replace ACSS output:
    3, Custom order HDMI replace RJ45 I2S input.
    4, Custom order Two 6.3MM headphone outputs.


    Last Updated @ 7/15/2017 3:39:14 PM



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      2. The warranty does not cover damage caused by human factors, accident, misuse of the product, unauthorized alternation to or change of parts or components of the product, act of God or problems of power supply.
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      4. No warranty is offered if the warranty label on the product is altered or damaged.
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