Wisdom in mind,   enthusiasm at heart.

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

Price:     USD1380  ( Built in TCXOs  ) (Exclude shipping cost)

Click to read    FAQ
Review:  http://www.hifizine.com/2011/03/audio-gd-nfb-7-dac/
Click to read the USB-32 character                              USB-32 Introduce
Audio-gd products had design and test based on the AP SYS-2722 (The top-drawer professional equipment in world)

　

Summarize
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 / AES / coaxial RCA / Optical  / USB / I2S
DAC output :   XLR / RCA / ACSS