Wisdom in mind,   enthusiasm at heart.

NFB-10SE（USB applied TE7022）
NFB-10.2（USB applied TE8802）
Discrete  DAC+ Headphone amplifier / Preamplifier
Supports full speed Asynchronous Transfer Mode
Built in the Tenor TE8802 chip
Built in 2 Pieces Hi-end grade WM8741 Chips

NFB-10SE Price:  USD499 (Without remote control )
                               USD550 (With remote control )
NFB-10.2 Price:   USD539 (Without remote control )
                               USD590 (With remote control )

How to install the TE8802 driver?
Fully balanced design built by discrete analog stages without any OPA and couple caps in the signal channels.
Non- feedback ACSS analog output stage .
R-core transformers.
Total of 7-group dedicated power circuits are used to purify the power supply.
Four-channel digitally controlled relay-based volume control to avoid channel imbalance and improve sound quality. NFB-10SE has 48 steps volume level control in both high gain mode and low gain mode. The total 96-step volume control ensures smooth control of the volume level.
3 channels digital input :   coaxial /  Optical / USB
DAC output :   XLR / RCA / ACSS  (User can setting with either variable and fixed output level )
Headphone output : 4 pins XLR / 6.3MM SE
USB Audio Class 2 High-speed Input from PC/MAC (NFB-10.2)
Supports full speed Asynchronous Transfer Mode (NFB-10.2)
Resolutions support 16 / 24-Bit with sampling rate support 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz  (NFB-10.2 USB model)
Supports up to 24Bit/192KHz (coaxial  )
Supports 2X , 4X and 8X oversampling customers setting
Memorizes all settings and it could resume the last settings when power on.

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
If only the RCA or 6.3MM headphone  is used, is the NFB-10 being wasted or not fully utilized?
       NFB-10 is a real balanced DAC . It has balanced output (ACSS, XLR and balanced headphone output) and single-ended output . There are 4 ACSS amplifiers in the NFB-10 for balanced outputs and balanced inputs. Even when a single-ended output is used, the “Dual WM8741” DA chips will perform fully thanks to the fully balanced design.

Feedback :
http://www.head-fi.org/t/519166/audio-gd-nfb-10/1065#post_7699634

Modification guide on headphone jack for 4-pin balanced headphone output.
   Click here to read:   modification guide
Parts for the modification is USD30. (Includes one female 4-pin plug and one male 4-pin plug, some tapes and some WBT tin solder.)