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audio-gd-nfb1-amp-front-onAudio-GD - NFB1 AMP 2019 - Balanced Pre / Headphone Amplifier (XLR, RCA, ACSS)Audio-GD - NFB1 AMP 2019 - Balanced Pre / Headphone Amplifier (XLR, RCA, ACSS)Audio-GD - NFB1 AMP 2019 - Balanced Pre / Headphone Amplifier (XLR, RCA, ACSS)Audio-GD - NFB1 AMP 2019 - Balanced Pre / Headphone Amplifier (XLR, RCA, ACSS)

Audio-GD - NFB1 AMP 2019 - Balanced Pre / Headphone Amplifier (XLR, RCA, ACSS)

€ 599
€ 495 excl VAT
Audio-GD - Remote Control (IR) Aluminium
Headphone output gain
Power cable (Default C13 EURO)
Additional RCA output (Replacing ACSS)
In stock
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  • Description
  • Specifications

NFB1 AMP & R1 R2R DAC - Please contact!

Audio-GD - NFB1-AMP - Balanced Pre / Headphone Amplifier

NFB-1AMP is a true balanced design applying the newest ACSS design based on the ultimate Master-9 which can improve the XLR connection to sound as good as the ACSS connection. They seem complex , but in fact they are the most simple design the world has ever had , their a lot components to process the power supply. The simplest and shortest signal journey brings out the most neutral and least colored sound.

NFB-1AMP applies very low distortion single stage ACSS amplifier and soldered directly on the motherboard. It is a fully class A preamp / headphone amp and applies class A power supplies.

  • Fully balanced class A design built by discrete analog stages without any OPA or coupling caps in the signal channels.
  • Non- feedback ACSS analog output stage.
  • Uses high grade parts and exactly matched transistors.
  • Four-channel 100 steps digitally controlled relay-based volume control avoids channel imbalance and improves sound quality .
  • Discrete class A Power supply
  • Exponential volume characteristic
  • Drives headphone output ot 8000mW at 40 ohm output
  • All OCC and hi-end grade components, including DALE resistors, WIMA caps, custom order NOVER (UK brand) caps.
  • Memorizes all settings and resumes the last settings when powered on.

2019 Edition

The pure analog technical design is difficult (impossible?) to upgrade. The 2019 Edition has got new firmware to offer additional functions and easy control of the functions. Sound quality is same with previous generation.


  • 1. XLR balanced
  • 2. RCA single ended
  • 3. ACSS balanced
  • 4. RCA single ended
  • 5. XLR balanced


  • XLR inputs can be replaced by RCA single ended inputs
  • ACSS input can be replaced by RCA single ended input


  • Preamp / DAC output :   XLR / RCA / ACSS (variable)
  • Headphone output : 4 pins XLR / 6.3MM SE


The DAC consist of A tuned low noise, low flux leakage, R-cores transformer. In total 65W power to supply all digital parts and the left and right analog boards. The DC power is distributed separated power regulators. All are pure class A low noise shunts; fed by linear power supplies. Resulting in ultra-high speed and clean power for all individual parts.


Volume control consist of relay-controlled attenuators. Fully-independent, fully-balanced stereo volume controls. The volume controls feature consist of high-precision 0.05% tolerance film resistors and golden contact relays. Buffered inputs and outputs.There 4 channels volume boards are built in the unit to achieve ultimate balanced volume control. They are controlled by a digital signal controlling the high quality relays switching the precision resistors in analog area.

Audio-GD lineair volume characteristic Volume steps in comparison to standard volume control
volumecontrol1 volumecontrol2

Quality of volume control is very important in balanced applications . It have to effectuate the four channels to work as synchronous as possible to keep the balanced signal in perfect shape. In traditional volume controls the balanced output will introduce distortion which will negatively influence sound quality and performance and might even get worse than a single ended setup and waste the advantages of balanced designed solution.



Brand URL :
Weight: 5 kg
Width: 360 mm
Length: 240 mm
Height: 80 mm
Magna Hifi - Webshop: Audio-GDAudio-GD


RCA: 0.7V to 5V RMS, XLR: 0.7V to 10V RMS
20V RMS (max) - balanced, 10V (max) - Single ended, 2.4mA (max) ACSS
20V RMS (balanced)
8000mW 40 ohm, 3500mW 100 ohm, 1200mW 300 ohm, 600mW 600 ohm
W240 X L360 X H80(mm, Fully aluminium )
Remote Control
IEC Power Cord

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