Audio-gd :: NFB-7.32 Dedicated Discrete Fully Balanced DAC, 32bit/192K Sabre ES9018 (32bit / 384K Asynchronous Transfer USB), very low jitter PLL
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Audio-gd NFB-7 DAC

NFB-7 (Version 2014 )(DSD / DXD )(Since 1st May 2014)#

Dedicated Discrete Fully Balanced DAC
  • DSD , DXD support from USB &I2S
  • 32bit / 384K Sabre ES9018
  • 32bit / 384K Asynchronous Transfer USB-32 Chip
  • OCC wires and TCXO applied


Main features

  • Fully balanced design built by discrete analog stages without any OPA and couple caps in the signal channels.
  • Non- feedback ACSS analog output stage
  • Uses 3 units R-core transformer , more than 40,000uf audio grade NOVER capacitors are used to ensure ample and smooth power feed.
  • A total of 15 groups of high-quality class A parallel connection PSU connect to double-stage PSU power supply for all digital and analog circuits.
  • To achieve high S/N, the control circuit is powered with separate regulator.
  • Uses most Hi-end grade parts and exact match transistors.
  • 6 groups digital input : coaxial BNC+RCA / coaxial RCA / Optical / USB / I2S (The input 2 had both BNC and RCA sockets, but at the same time only can connect either )
  • DAC output : XLR / RCA / ACSS


Audio-Gd NFB-7

Simple and short signal transfer is best#

The NFB-7(2014 ) applies the newest ESS high-end Sabre32 DA chip ES9018 which can support up to 32Bit/384KHz input. ES9018 in voltage output model, there is -12DB THD+N worst, to be achieve the best performance of ES9018 , must work in current output model. In some other ES9018 built in DAC design , ES9018 output signal have to through 3 step OPAs implement analogy signal process. The NFB-7(2014 ) 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 .



Audio-Gd NFB-7


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.
Audio-Gd NFB-7