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DAC-19.20 (Limit Edition)

Fully Dedicated Discrete  R-2R ladders DAC Built In 2pcs PCM1704UK
OS/NOS Modes Selection On Front Plate

Built In FPGA Processor , Reject The Jitter 

32bit / 384K Asynchronous Transfer Amanero Combo 384

Built in OCC , and Hi-End parts

Price:     ( Exclude shipping cost)
USD899 (Stock clocks version)
USD999 (Accusilicon clocks + Crystik version)
Please send your address, name to
audio-gd@vip.163.com get the quote.



Summarize Use Manual Specs Custom Option Shipping Cost

Please note : DAC-19.20 built in PCM1704UK, it can not support DSD native.
Click download the driver :  Amanero combo 384

About the DAC-19:
        The DAC-19 is our longest life products .
        We have  released the first generation DAC-19 in 2005, DAC-19SE in 2006, DAC-19MK3 in 2008, DAC-19DSP in 2010, DAC-19 (11 Anniversary edition ) in 2016 .
         Since 2010,  TI want to discontinued the PCM1704 chips , cause the price quite expensive , even sale USD150 / pc in market.
         The DAC-19.20 is the best design of DAC19 series, and it is the limit edition because the PCM1704 cost is expensive and impossible buy nowdays .
         It had a lot improved than the older models.
         1, Its all parts had assemble on board made the sound more neutral and less coloration . ( except the USB module , the USB chip may upgrade every 3-5 years ,  so the module design allow users can  easy upgrade in future if had the higher performance USB chip release ) .
          2, The stronger FPGA hardware apply (same as the R 7) had offer the best digital process performance , reproduce the best detail, dynamic sound but still analog .
          3, The all signal parts had power supply by the class A PSUs .
          4, In all older model DAC19s that the SPDIF input applied the DIR9001 which limit the input sampling can not over 96K and limit the sound quality . In DAC19.20 model the SPDIF input decoder has built in the FPGA , it can support up to 192K input with better sound quality, and it is upgradeable .

          Multi-ply shield boards to isolation the power input socket , transformer, power supplies, digital part and the analog part .
          Fully Discrete design built by discrete analog stages without any OPA and coupling caps in the signal channels .
           Non- feedback ACSS analog output stage
           Large R-core transformers and Hi-fi grade parts like DALE resistors, WIMA caps and OCC wires .
            A total of 5 groups class A parallel mode PSU power supply for all digital and analog circuits.
           4 digital inputs:   USB / Optical / Coaxial / HDMI
           Support up to 384K / 32 BIT through USB and HDMI-IIS
           DAC output:   RCA / ACSS


Technology detail

Detail of the Current Conveyor Technology

Simple and short signal transfer is best:    
              The DAC-19.20 is a fully  discrete design. Applies the 2 Pieces Expensive high-end grade PCM1704UK which can support up to  32 Bit / 384KHz through USB / I2S input . The  SPDIF input support up to 192K / 24 BIT. 
              Different  to other PCM1704UK designs , we applied Non-feedback ACSS analog stages. The  PCM1704UK feed to the ACSS analog stages without any OPAs and couple caps so it can avoid sound coloration .
              The ACSS is a non-feedback technology made with fully discrete amplifiers. Most people know the global feedback design can offer better specs in test measurements, and classic 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.
              The ACSS circuit naturally working in current model and have design  current input , it can transfer the PCM1704UK current signal to output and implement the I/V conversion in current model in one ACSS amp . And this ACSS amp only have one current gain stage , the PCM1704UK output signal only through one stage can arrive the output stages .
             The shortest signal journey can reproduce the best detail and dynamic, and almost without sound coloration , It can show the  real performance of the PCM1704UK .
            The output buffers are Non-feedback class A FET (Apply K170 which is expensive in market nowdays) design. The output impedance only had 10 ohm .
            The 2 OPA opamp’s are functioning as DC servo, this way no coupling-capacitors are needed and DC output is automatically biased! Resulting in a perfectly neutral sound. 

            There are no relays or other switches in the signal path after DA modules to perform the best and purest sound quality.

Importunacy of the FPGA :
FPGA stands for Programmable Array Logic. 
             Nowadays the FPGA is applied in a lot of high end DACs; like the popular ROCKNA WAVEDREAM DAC. 
             The internal hardware design is fully controlled by complex software. A huge advantage is the fact that the software in the FPGA can easily be upgraded offering new features or improve the performance. Such design is much more flexible and future proof!

FPGA tasks 
 The FPGA  is responsible for:
             1. High performance SPDIF interface, replacing traditional less good performing SPDIF interface chips like DIR9001, WM8805 or AK411X,etc.
             2. Full re-clocking process with FIFO design applicable on all inputs. This way the output data keeps fully synchronized with the clock signal to reject any jitter.
             3. Built in 2X, 4X and 8X oversampling and digital filters and on top of this 4 different true NOS (only analog 6dB filtering) modes. To completely configure it to your liking!

Heavy power supplies design:
            DAC-19.20 applies the excellent 2 pcs PCM1704UK 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 DAC-19.20
had total  Uses 5 groups of high-quality class A parallel connection PSU with dedicated DC supply double-stage PSU, which can offer very clear DC power for the DAC, producing a very black background and neutral sound characteristic. The double-stage PSU is very important for digital parts. Some designs may have very low jitter in theory, but if the power is supplied by a dirty or low-speed power supply, it will increase the jitter and pollute the data, and degrade the sound quality obviously.
             The class A parallel connection PSU has very high input impedance to avoid pulse through the PSU from affecting the DAC and low output impedance with very fast speed and high linearity, so it is a very clean power supply. In my experience, its sound is better than battery power supply, better human sound and neutral.
        Diagram of the  Class A PSUs for analogy parts      Diagram of the Class A   PSUs for digital parts


Built in Hi-End grade parts :
DAC-19.20 have built in most high end grade parts, like the DALE resistors (USA), WIMA caps (Germany)  and NOVER parts (UK) .
         These parts have through long term practices and consider have least sound coloration .
         Built in high end grade parts have not warranty have the good  sound , but the best technology design with high end grade parts can have the high ended sound quality .





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