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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 ( in Preamp model connect to power amp ):
Power On :
power ON ---->    NFB-10 power ON ----> Amp power ON
Power Off:
    Amp power OFF
---->  NFB-10 power OFF   ---> Source power OFF .
In USB model, start the computer then power on the NFB-10 is necessary because the NFB-10 have not applied the USB+5V for less interrupt from the computer.

Setting the NFB-10.33 have I2S input:
If your don't need the NFB-10.33 have USB input, you can change to I2S input .
Please pull out the power cord before the cover of the chassis is taken off .
             2, Take off the two screws on rear and take off the USB module.
             3, The I2S input socket defines as the photo.


How to set the NFB-10.33 DAC output in ¡§variable line level¡¨ mode or ¡§fixed line level¡¨ mode?
         NFB-10.33 has dedicated DAC output in RCA, XLR and ACSS. In default, its output level mode is set to ¡§variable line level¡¨ (If your amplifier or active speaker has no volume control, we advise to set it to ¡§variable line level¡¨). If users would like to switch to ¡§fixed line level¡¨ mode, please push a jumper into the socket as illustrated in the following photo.
The jumper is pushed into the socket labeled in the red pane for ¡§fixed line level¡¨ mode. (Please pull out the power cord before the cover of the chassis is taken off)      


If only the RCA or 6.3MM headphone  is used, is the NFB-10.33 being wasted or not fully utilized?
       NFB-10.33 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-10.33 for balanced outputs and balanced inputs. Even when a single-ended output is used, the ES9018 DA chips will perform fully thanks to the fully balanced design.

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 while got the goods .
        If the volume switch broken during rude custom check , there is a spare volume switch in the pack for customers replace by themselves .
        In our experiences , scrape chassis or shatter the volume switch is very infrequent ( In case less than 1%).

Front view:    
Power button:
Power ON / OFF the NFB-10.33. 

DAC/HP button:
Select the output modes.
         H:   Headphone output.
         P:   Preamplifier output. 
         Users can choose between ¡§variable line level¡¨ and ¡§fixed line level¡¨ mode in Preamplifier output. In ¡§fixed line level¡¨ mode, NFB-10.33 becomes a  Fully Balanced Dedicated DAC; In ¡§variable line level¡¨ mode, NFB-10.33 becomes a Fully Balanced Dedicated DAC + Fully Balanced Preamplifier.


Gain button:
Select the high / low gain mode.
        H: High gain mode at +12dB.    
        L: Low gain mode at 0dB.


Selector button:
Select the input sources.   
        1: USB input.
        2: Optical input.
        3 : Coaxial RCA / BNC input. ( The BNC and RCA coaxial input only can connect either simultaneous .)

Volume knob:
        Turn Left :     Reduce the volume.
        Turn Right  : Increase the volume .
        Because different sources may have different output level, so before select the input sources, reduce the volume is more safe .



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