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NFB-11.28  Performance Edition

(The Top Grade ESS9028 PRO Built In)

Discrete full non-feedback design

DAC+ Headphone amplifier / Preamplifier


Built in Sabre ES9028  Pro  
DSD64-512 , DXD, PCM 32bit / 384K  support from USB
A femtosecond Accusilicon 318B clock built in
8 group double stage PSUs built in



Summarize Use Manual Specs Shipping Cost

Please note:
The NFB-11 built in high biase current amps , for most headphones at normal listen volume it is working at class A state , so working long time will become a little warm, there is better keep it have good are follow state and don't cover other things on its top side .
      The NFB-11 must install the driver for Windows USB connect. But Mac OSX , Linux and SPDIF without driver install necessary .

How to set the NFB-11 DAC output as variable or fixed level ?

The NFB-11 has one group  dedicated DAC output, In default its output level setting is at variable mode only .
      If users only want the fixed volume mode  , change the jumper as below picture . Then users can select between headphone , variable output mode (DAC + Preamp ) and fixed output mode (Decent DAC ) .
      (Be care, if the NFB-11 DAC output connect to a non volume control external amp , don't turn to fixed output model , or setting to variable output model only . The headphone output always have volume control. )



Setting the NFB-11 with warmer sound flavor ?
Push into two jumpers in the points can let the  sound warmer for match the bright headphone. (Please operate while the unit power off, and pull off the power cable if you want to remove the top cover board ).


Digital filter settingG
(We have do a lot audition on the setting, we are recommend keep the default setting for get the most neutral sound .
Change the digital filters setting can change the sound flavors)

IIR0 and IIR1GFor DSD.
47K Push Into Push Into
50K Pull Off Pull Off
60K Pull Off Push Into
70K Push Into Pull Off
@  FIR_0  FIR_1 FIR_2
Fast roll-off,  Linear: Push Into Push Into  Push Into
Slow roll-off, Linear: Push Into Push Into Pull Off
Fast roll-off, Minimum: Push Into Pull Off Push Into
Slow roll-off, Minimum: Push Into Pull Off Pull Off
Fast roll-off, Apodizing: Pull Off Push Into Push Into
Fast roll-off, Hybrid: Pull Off Pull Off Push Into
Brickwall filter: Pull Off Pull Off Pull Off

The NFB-11 Functions:

Front plate:
Output switch:        Select output between headphone and DAC output ( Variable level) and DAC output ( Fixed level).
Gain switch:           Select gain between low gain (+0DB) and high gain (+12DB).
Volume knob:         Control the volume level of the headphone and variable DAC output.
Input switch:           Select source between USB, coaxial and optical.   

     Power socket:        For power input and power ON/OFF switch.
     USB socket:           For USB input.
     Opt socket:            For optical input.
     Coax socket:           For coaxial input.
     DAC out sockets:    For dedicated DAC output.
DAC output ( Variable level) and DAC output ( Fixed level).



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