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NFB-15(Version 2014 )(Since 20th May 2014)

Discrete  DAC+ Headphone amplifier / Preamplifier
32bit / 384K Asynchronous Transfer  USB-32 Chip
Built in 2 Pieces Hi-end grade WM8741 Chips

       

           
Summarize Use Manual Specs Technology Detail Custom Option Shipping Cost

The rule of the power ON /  OFF:
Power On :
     Source
power ON ---->    NFB-15 power ON ----> Amp power ON
Power Off:
    Amp power OFF
---->  NFB-15 power OFF   ---> Source power OFF .

 How to set the NFB-15 DAC output as variable line level only?
   
The NFB-15 has one group Line out for dedicated DAC output, In default its output level setting is at variable model . But owners can set it to can select between variable and fixed or output variable line level only . See the photos, change the jumper to "variable" side to set the DAC output to variable only.

         

 The NFB-15 Functions:

     Front plate:
    
Output switch: Select output between headphone, Fixed DAC output and Variable DAC output.
    
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.
    
Selector switch: Select source between USB, coaxial and optical.

     Rear:
     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.
(The DAC output level can be chosen between variable and fixed, see below).

Please note :
      Before shipping we had double check the gear have the perfect state of the outside . 
        Few countries customs workers is rude maybe scrape the chassis or volume knob while custom check , if the scrape have not effect the performance , customers can pay the shipping cost for ask we send the free parts for replacement .
        If the volume switch broken during rude custom check , there is a spare volume switch in the pack for customers replace by themselves , this is had not soldering necessary .
        In our experiences , scrape chassis or shatter the volume switch is very infrequent ( In case less than 1%).
        The product had include shipping insurance , if had any damage , can ask the express company make the compensation .
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9 types digital filter users setting.
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Please note:
    
     In 4X oversampling setting ,while select SPDIF input but without input signal, maybe output some noise.
     If the input sampling higher than the NFB-15 setting sampling, maybe cause some noise output.


NFB-15]2014^
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NFB-15.32 Digital Filters Description Frequency response diagram from headphone / RCA output
( Click to zoom)
OS : 8

Filter : 2

8X oversampling , Minimum phase apodising filter.
Up to 48KHz support.  

Input sampling 44.1KHz,24Bit,
-2.5DB at 20KHz
Input sampling 48KHz,24Bit,
-0.2DB at 20KHz , -3DB at 23KHz
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OS : 8

Filter : 1

8X oversampling , Linear phase apodising filter.
Up to 48KHz support.  

Input sampling 44.1KHz,24Bit,
-0.2DB at 20KHz , -3DB at 25KHz
Input sampling 48KHz,24Bit,
-0.2DB at 20KHz , -3DB at 25KHz
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OS : 8

Filter : 3

8X oversampling , Linear phase half-band filter for backward compatibility.
Up to 48KHz support.

Input sampling 44.1KHz,24Bit,
-2.5DB at 20KHz
Input sampling 48KHz,24Bit,
-0.2DB at 20KHz , -3DB at 23KHz
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OS : 4

Filter : 2

 4X oversampling , Minimum phase 'soft-knee' filter.
Up to 96KHz support.

Input sampling 44.1KHz,24Bit,
-3DB at 15KHz
Input sampling 48KHz,24Bit,
-3DB at 17KHz
Input sampling 96KHz,24Bit,
-0.2DB at 20KHz , -3DB at 31KHz
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OS : 4

Filter : 1

4X oversampling , Linear phase 'soft-knee' filter.
Up to 96KHz support.  

Input sampling 44.1KHz,24Bit,
-3DB at 15KHz
Input sampling 48KHz,24Bit,
-3DB at 17KHz
Input sampling 96KHz,24Bit,
-0.2DB at 20KHz , -3DB at 31KHz
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OS : 4

Filter : 3

4X oversampling , Linear phase 'brickwall' filter.
Up to 96KHz support. 

Input sampling 44.1KHz,24Bit,
-2.8DB at 20KHz
Input sampling 48KHz,24Bit,
-0.3DB at 20KHz , -3DB at 24KHz
Input sampling 96KHz,24Bit,
-1DB at 20KHz , -3DB at 42KHz
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OS : 2

Filter : 2

2X oversampling , Minimum phase 'soft-knee' filter.
Up to 192KHz support. 

Input sampling 44.1KHz,24Bit,
-3.2DB at 20KHz
Input sampling 48KHz,24Bit,
-2.5DB at 20KHz , -3DB at 22KHz
Input sampling 96KHz,24Bit,
-0.5DB at 20KHz , -3DB at 25KHz
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OS : 2

Filter : 1

2X oversampling , Linear phase 'soft-knee' filter.
Up to 192KHz support.

Input sampling 44.1KHz,24Bit,
-3.5DB at 20KHz
Input sampling 48KHz,24Bit,
-2.7DB at 20KHz
Input sampling 96KHz,24Bit,
-0.8DB at 20KHz , -3DB at 25KHz
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OS : 2

Filter : 3

2X oversampling , Linear phase 'brickwall' filter.
Up to 192KHz support.

Input sampling 44.1KHz,24Bit,
-2.5DB at 20KHz ,  -3DB at 22KHz
Input sampling 48KHz,24Bit,
-2DB at 20KHz ,  -3DB at 23KHz
Input sampling 96KHz,24Bit,
-0.2DB at 20KHz , , -3DB at 40KHz


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