Wisdom in mind,   enthusiasm at heart.

NFB-2 (2014)
Dedicated Discrete DAC 

32bit / 384K Asynchronous Transfer  USB-32 Chip
Built in 2 Pieces Hi-end grade WM8741 Chips

Price:   USD499    (Exclude shipping cost)

Click to read    FAQ
Driver download                              USB-32 Introduce
Audio-gd products had design and test based on the AP SYS-2722 (The top-drawer professional equipment in world)


Fully discrete analog stages without any OPA and couple caps in the signal channels.
Non- feedback ACSS analog output stage .
6 groups non-feedback Class A power supplys for the whole gear ( another 1 linear PSU for the control parts ).
R-core transformers.
More than 20,000uf audio grade NOVER capacitors are used to ensure ample and smooth power feed.
Uses most resistors are 1% DALE , most caps are the WIMA caps .All transistors are Toshiba and Hitachi.
3 channels digital input :  RCA and BNC coaxial / Optical / USB  (Please note : The BNC and RCA coaxial input can not connect source at same time .)
DAC output :   RCA / ACSS

Sound Characteristics: 
    "Neutral but smoothness sounding ,it doesn't sound skeletal or digital (or metallic). There's meat aplenty on them bones . It's a sigma-delta DAC chip implementation without the dryness, neutrality without the emotional disconnection" - John Darko

Feedback :
John Darko review the NFB-2.1
http://www.digitalaudioreview.net/2012/03/audio-gd-nfb-21-dual-wolfson-wm8741/
http://www.head-fi.org/forum/thread/512856/audio-gd-nfb-2-nfb-3-delivery-impression-thread/30
http://www.digitalaudioreview.net.au/index.php/audio-reviews/digital-source-reviews/item/177-audio-gd-nfb-2-dac-19-series
http://www.head-fi.org/products/audio-gd-nfb-2-and-nfb-3/reviews