NFB-11.38  Performance Edition,

the Top Grade ESS9038 PRO Built In
Discrete full non-feedback design
DAC+ Headphone amplifier / Preamplifier

Built in Sabre ES9038Pro
DSD64-512 , DXD,PCM 32bit / 384Ksupport from USB
A femtosecond Accusilicon 318B clock built in
8 group double stage PSUs built in.

What is theUltra clock Accusilicon 318B ?
The one of the best clock in world.

What is the NFB-11.38 Performance Edition?
In this price range:
You may can not easy find an all in one model which is built in ES9038PRO,but not the cheap and low performance ES9038K2M .
Even you can, but you may can not easy find a model had the very low THD .
Even you can, but you must can not find the model built in full discrete amp, and it is Full-Non-Negative-Feedback design! The low THD is depend on the ultra linear design but not depend on the deep negative feedback.
(The THD test with AP-2722, input 0DBFS, output 3V,click to zoom )

In this price range:
Not to say the non feedback design, you may can not easy find a model built in the massive power supplies.
In total 8 group regulators built in. Please read the below detail of the regulators, it most exist in the USD1500+ devices .
1,The analog parts applied two group super linear discrete regulators.
2,The digital parts applied the double stage regulators, 4 groups are the ultra speed regulators.
3,Another two groups are the OPA + discrete transistor serve regulators, its output ripple far lower than 1uV, they powered supply for the Left and Right channels of ES9038 PRO built in DACs separately . Compared to the ultra speed regulator, the serve regulator can improve the sound quality much better on detail and dynamic . The L and R separate power supply boost the sound stage much wider and deeper . The very pure power supply let the unit has very good performance on jitter reject !
(test with TCXO built in unit , click to zoom)

In this price range:
Not to say the non feedback design, you may can not easy find a model built in the massive power supplies.
In total 8 group regulators built in. Please read the below detail of the regulators, it most exist in the USD1500+ devices .
1,The analog parts applied two group super linear discrete regulators.
2,The digital parts applied the double stage regulators, 4 groups are the ultra speed regulators.
3,Another two groups are the OPA + discrete transistor serve regulators, its output ripple far lower than 1uV, they powered supply for the Left and Right channels of ES9038 PRO built in DACs separately . Compared to the ultra speed regulator, the serve regulator can improve the sound quality much better on detail and dynamic . The L and R separate power supply boost the sound stage much wider and deeper . The very pure power supply let the unit has very good performance on jitter reject !
(test with TCXO built in unit , click to zoom)

In this price range:
We designed the NFB11.38 performance edition not only based on the AP  measure but through a lot auditioned to confirm the part's parameters.
It has the dynamic sound with excellent detail, very neutral and monitor sound but still musical.
Its frequency bands very flat, no any drop off in 20Hz-20KHz.
(The THD test with AP-2722, input 0DBFS, output 3V,click to zoom )

In this price range:
The below diagram show the THD + Noise level. It is quite flat on the bandwide, the THD reduced  at high frequency , which is make the high frequency much pure and fresh, this is not depend on the negative feedback, it is Full-Non-Negative-Feedback design built in.

In this price range:
We have the serious quality control on the products, every unit before shipping , must burn in 100 hours , and through the AP ATS-2 measure to confirm the performance achieved the standard .

Summarize:
Fully  discrete analog stages with Non- feedback ACSS analog amplifiers built in
Built with 4 pcs 20W (in total 80W) high speed output transistors, no matter to drive the most headphones.
Total of 8 groups dedicated power circuits  are used to purify the power supply.
High-End grade parts built in , ALPS 27 volume pot .
CMC pure copper RCA sockets ect.
3 channels digital input :   coaxial /  Optical / USB
DAC output :   RCA  (User can setting with either variable level as  DAC with preamp combo or fixed output level as dedicated DAC )
Headphone output : 6.3MM SE

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 setting：
(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)

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 headphoneand variable DAC output.
Input 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.DAC output ( Variable level) and DAC output ( Fixed level).