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NOS 7(The PCM1704 Ultimate Design)
Dedicated Discrete Fully Balanced DAC

Fully new DSP software
Built in 8 Pieces  PCM1704UK
Supports up to 768KHz
32bit / 384K Asynchronous Transfer  Amanero combo384
OCC wires & TCXO applied


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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.

              The NOS 7 is a real fully balanced discrete design. Applies the 8 Pieces Expensive high-end grade PCM1704UK which can support up to 24Bit/192KHz  through SPDIF input and 32 Bit / 384KHz through USB / I2S input . Similar to other PCM1704UK designs , we applied Non-feedback ACSS analog stages. The 8 pcs 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.

Output buffer:       
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.
DSP-1 processor:
             For the most real like sound reproduce, Mr.Kingwa had spend a long term to design and rectify the new NOS DSP software personally, not only based the the software codes , but he also well know on the hardware compatible and sensitivity on the sound quality .
             In the design had applied -6db /oct passive analog filter , you can hear the wonderful sound of the NOS but you can't hear the noise as other some NOS design .
            100 people may had 99 type prefers . We had design two NOS modes in the software for users select. Since Oct. 12th. 2016, the new Ver 2 software had offer 3 Nos modes .
            One is the best speed data process, another is applied large algorithm to process the data.
            The full new design concept had boost the PCM1704 support up to 768KHz even 1536KHz (test in emulation mode).
           A high exact TCXO for the DSP chip running in the asynchronous data process mode, it don't want the source master clock input , which is reduce the signal transmit request, FIFO design and rebuilt the clock by the DSP chip, can refuse the jitter .
Power supply:
            NOS 7 applies the excellent 8 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 NOS 7 had total 21 PSU groups are applied. Uses 19 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.




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