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Order now only USD680 (exclude shipping cost) !
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NFB-28 (Version 2014 )(DSD / DXD )(Since 1st May 2014)
Discrete  DAC+ Headphone amplifier / Preamplifier
With XLR / RCA analog inputs

DSD , DXD support from USB
32bit / 384K Sabre ES9018
32bit / 384K Asynchronous Transfer  USB-32 Chip
Price: USD750
Extra, high quality metal remote :  USD50 

      

            

Summarize Use Manual Specs Technology Detail Custom Option Shipping Cost


Click to read    FAQ
USB-32 Introduce and drivers download
Reviews:   
http://www.head-fi.org/t/676930/audio-gd-nfb-28
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 coupling caps in the signal channels, built in real balanced DAC, output for headphone (4-pin XLR or 1/4") and  DAC (fixed output) with preamp (variable output)
Non- feedback ACSS analog output stage .
LED display avoids RF disturbance for better sound quality
Large R-core transformers and Hi-fi grade parts like DALE resistors, WIMA caps .
Total of 6-group PSUs are used to purify the power supply , the analog amp has discrete PSU power supply
Four-channel digitally controlled relay-based volume control to avoid channel imbalance and improve sound quality.
80 steps volume level control in both high gain mode and low gain mode. 160-step volume control ensures smooth control of the volume level.
4 digital inputs:   Coaxial RCA / Coaxial BNC /  Optical / USB
2 analog inputs:  XLR / RCA
DAC output:   XLR / RCA / ACSS  (User can set either variable output level as preamp or fixed output level as dedicated DAC )
Headphone output : 4 pin XLR / 1/4" (6.3MM) SE

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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 tape and tin solder.)


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