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NFB-1S(Version 2014 )(DSD / DXD )(Since 1st July 2014)
Dedicated Discrete Fully Balanced DAC
DSD , DXD support from USB
32bit / 384K Sabre ES9018
32bit / 384K Asynchronous Transfer  USB-32 Chip

          

               
Summarize Use Manual Specs Technology Detail Custom Option Shipping Cost


 
About NFB-1S
Simple and short signal transfer is best:
    
The NFB-1S applies the newest ESS high-end Sabre32 DA chip ES9018 which can support up to 32Bit/384KHz input .
       In some other ES9018 built in DAC design , ES9018 output signal have to through 3 step OPAs implement analogy signal process .
       The NFB-1S had different design , applies Non-feedback ACSS design. The ES9018 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 ES9018 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 ES9018 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 ES9018 .
       So our ACSS design is the best combo with ES9018 achieve the best performance .
       
        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 ES9018 .

Multi-ply  Class A power supplies are the key of sound :

        NFB-1S applies the excellent DA chip ES9018 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-1S uses a high performance R-core transformers. The power transformers and rectifiers are carefully shielded from the electric field of the power transformers and rectifiers' frequency transmission. More than 38,000uf audio grade NOVER capacitors are used to ensure ample and smooth power feed. The NOVER capacitors are specially custom order from NOVER (U.K.) according to Audio GDs requirement.
       
The NFB-1S uses 7 groups of high-quality  PSU with dedicated DC supply.
       The analog output stages are power supplys with the class A parallel connection PSU.
       The class A parallel connection PSU has very high input impedance for avoid pulse through the PSU from affecting the DAC and low output impedance with very fast speed and high linear , so it is a very clean power supply. In my experience, its sound is better than battery power supply, better human sound and neutral.
      
To achieve high S/N, the control circuit is powered with separate regulator.

              
Diagram of the  Class A PSUs for analogy parts                                       Diagram of the Class A   PSUs for digital parts
                 
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