audio gd  r27  ปี 2021   ประกัน 2 ปีครับ 
Full upgrade version: USD2090
  Below upgrade options had included in the Full upgrade version:
  1, Upgrade Femtosecond Accusilicon *2 Femtosecond clocks,
  2, Upgrade USB interface with isolator and separate PSU,
  4, Upgrade mini remote to metal remote.)
R-27 (2021 version) feature:
 1,     USB and HDMI apply the separate isolators and isolate pure class A PSUs for avoid the interrupt from computer and HDMI sources. (New Feature)
2,     USB apply the bidirectional isolator that can transmit the IIS signal to the FPGA processor and receive the clock signal from the FPGA processor, the USB interface without on board data clocks, the signal transmit is much exact, the sound quality get the much improve , similar to the last generative R-27 combine with DI-20 (But not DI-20HE) level. (New Feature)
3,     HDMI input apply isolator for improve the sound quality . (New Feature)
4,      The FPGA process data in the  parallel mode.
         The IIS data is series transmit mode, every data must need one clock cycle to process or transmit, one frame data ( Include L and R data) must need 64 clock cycle to process or transmit, so the data has effect by the 64 clock cycles.
         But the parallel data process and transmit mode only need one clock cycle can finish the one frame data process and transmit, that can avoid the effect of clock stability .
          The IIS input (Include USB and HDMI-IIS) has recombine become dual 32bit parallel data once input , and the SPDIF input after decoder, has recombine become dual 24bit parallel data, and the DSD input has recombine become dual 64bit parallel data once input.
          The parallel process and transmit mode can improve the sound quality on the transparency and detail but still analog.
5,       Full new configuration clock manage design built in, improved on the clock timing.
6,      DSD asynchronous clock technology has apply that improves the sound quality obviously.
7,      DOP support from SPDIF input .

Pros and cons of R-2R DAC  :
Advantages:
         1.R-2R will not convert the clock signal into the output signal.
         2. R-2R is not sensitive to jitter .Delta-Sigma D/A is much more sensitive to jitter.
         3. The output signal is much more precise compared to Delta-Sigma D/A .
Weaknesses:
        1.THD today is extremely good with Sigma Delta chips in comparison to R2R ladders are good too but not as good.
        2. Glitches and accuracy of the ladder resistors are very difficult to avoid and require complex technology to resolve it.

R-2R basic design in the market:
          The R-2R DAC is very popular nowadays and available from DIY kits up to  completely   high-end products. 
          In the low range DIY market, the R-2R design is often based on old technology designed a long time ago by MSB and only includes basic R2R ladder design and do not include the wonderful correction design of the original MSB technology. This design uses data shift registers logic chips in series mode to convert the data to an analog signal. The structural R2R technology issues cannot be avoided, and performance is solely depending on the accuracy of the ladder resistors. 
ติดต่อ ลองฟัง สินค้า audi gd หลายรุ่นได้แก่
dac r7he r7 r8
amp หูฟัง r27 r28 
สินค้า ทุกรุ่น รับประกัน 2 ปี
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0880055156 เต่า ครับ 
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