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NFB-2.32]USB applied USB32^
Dedicated Discrete DAC 

32bit / 384K Asynchronous Transfer  USB-32 Chip
Built in 2 Pieces Hi-end grade WM8741 Chips

Price:   USD499    (Exclude shipping cost)
Accessories : Power cable and USB cable . If customers want optical cable please inform while place the order .


Summarize Use Manual Specs Technology Detail Custom Option Shipping Cost
What are the differences between these popular DAC chips:
@ Dual WM8741 ES9018 AD1955 AD1852 WM8740
SNR 128 DB (Mono) 120 DB 120DB 114DB 117DB
DYNAMIC RANGE 128 DB (Mono) 129 DB 120DB 114DB 117DB

About ACSS:

          ACSS (Audio-gd Current Signal System) is Audio-gd's system for transmitting audio signals in the current domain. This concept, first seen in 1966, we have used for many years, and since 2005, have evolved the technology to include all audio signals in our systems from the digital source to the power amplifier. Since 2006, ACSS comp5nts have become Audio-gd's most popular products.

About NFB?

       NFB mean Non-Feedback .
        The NFB-2.32 applies two pcs newest Wolfson high-end  DA chip WM8741 which can support up to 24Bit/192KHz input ( Coaxial  and USB). Compared to other WM8741 designs, Our NFB-2.32 applies Non-feedback ACSS output stages .
         The ACSS is a non-feedback technology made with discrete amplifiers. Most people know the global feedback design can offer better specs in test measurements, and non-feedback can't do well in test measurements but can offer better sound for the human's ears. Here is a conflict of the classic circuits. But the ACSS opens a new field, it can offer a least coloration sound which is more neutral with very low distortion and high linearity. So it can retain the dynamics, detail and neutral sound but not sound bright or harsh.
         In most design, the WM8741  feed to a difference voltage amp through voltage signal . In NFB-2.32 , the dual WM8741 has feed to the ACSS parts direct through balanced current signal . The current signal mode can  bring the best signal of the DA chips .
         The output buffers are Non-feedback. For low impedance, we applied the dual FET buffer output stage which is quite less colored than most conventional circuits, the output impedance is only 10 ohms.
         The two OPAs in the NFB-2.32 just for DC serve to keep the output DC offset at zero , allow the DAC analog parts are without couple caps to avoid coloration.
         The 32bit/ 192KHz USB interface outputs a I2S signal to dual WM8741.
         Applied the WM8805 as the SPDIF interface , its sound characteristic is same with the WM8741 which is detail but smooth, and it can support up to 192KHz input.  The WM8805 had quite low jitter (50PS),much less than the CS8416 ( 200PS ). Users can choice the DIR9001 module as the SPDIF interface instead WM8805, the replace is so easy without solder , only pull off and push into .
         (Note: While users want to replace the DIR module, please power off the NFB-2.32 and pull off the power cable at first )


Fully  discrete design.

          NFB-2.32 applies the excellent DA chip WM8741 and excellent analog output stages, but these are not the only keys of the best sound. The power supply is most important. Even applying the best DA chip and the best amp, if matched to a normal power supply, the total sound may still be average or sound musical but can't be neutral and detailed. That is why it is easy to find hi-end grade gears maybe without the best chips or amp stages, but with plenteous dedicated DC supply circuits.
The NFB-2 uses 6 groups of high-quality class A parallel connection PSU with dedicated DC supply.
           The class A parallel connection PSU has very high input impedance for avoid pulse through the PSU from affecting the DAC and low output impedance with very fast speed and high linear , so it is a very clean power supply. In my experience, its sound is better than battery power supply, better human sound and neutral.

Class A parallel connection PSU diagram




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