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HE-8

For who got love on PCM1704UK to order



Regenerative power supply

Apply 4 pcs the most real like sound DA chip PCM1704UK


Fully discrete real balanced  current transmition design

2 pc ultra high frequency 90/98 MHz Accusilicon 318B femtosecond clocks provide synchronous clock for whole unit

32bit / PCM384K asynchronous transfer Amanero 384 apply the FPGA synchronous clock

All inputs and digital parts have isolated to the analog parts

Input signal sampling display

Support external 10MHz clock input

All digital process mode settings accessible by buttons on front  (No need  to open the chassis).
 

    

         
Please note: The product improve cause the inside or outside change without inform .
 

Summarize Use Manual Specs Custom Option Shipping Cost

Please note: The PCM1704UK can not support DSD playback. User need conversion the DSD to PCM in the source device.
Price:
 USD2480 ( Exclude shipping cost . Include combo remote controller that can control the product and some lot audio-gd latest preamp and headamp models . It need two AAA batteries support by users .)  
Organic glass top board price  : USD25
  
Please send your address, name  to audio-gd@vip.163.com get the quote.

Two chassis versions available, customer must inform while place the order ,otherwise we ship the edition randomly:

HE-8 Black
HE-8 Silver
 
Please note:
Customer can order the HE-8 ship with the EC firmware that can allow the IN2 input become the 75 ohm external clock input , that is free.
Even though customer already bought the product, still can update the EC firmware by yourself .

Click to download the driver of  Amanero combo 384

Features of HE-8:
         1. Using the latest designed discrete servo stabilized power supply to feed the digital circuits, the noise level is comparable to that of a battery, but without the dry and thin sound characteristics of it, and thus the product's operating temperature is significantly lower than that of the previous model. The DA circuit and the analog circuit are still powered by a pure class-A regulated power supply for the best sound results. The whole unit applied in total 10 groups pure class-A regulated power supply .
          2. By listening to a turntable and studying its sound for a long time, we have successfully integrated the analog vinyl sound characteristics into this product, this being allowed optionally through the front panel.
          3. All inputs and digital parts have isolated to the analog parts.
         4. Display of the input signal sampling rate function.
         5. The 10MHz clock input allows the use of an external clock generator (Need update the firmware).
         6. The FPGA operates using the parallel data processing mode.
The IIS signal is serial data transmission. Each data bit requires one clock cycle. One frame of left and right channel data requires 64 clock cycles, so stability over a 64 clock cycles is needed.
The parallel mode only needs one clock to transmit and process the 32-bit data of the left and right channels, which greatly improves the processing speed and is less affected by the stability of the clock.
        IIS input data (USB and HDMI-IIS) is reorganized into two sets of 32-bit parallel data as soon as it is inputted.  After the SPDIF signal is demodulated, it is also sent to the next level of processing through two sets of 24-bit parallel data.
         According to listening comparisons, the parallel processing mode can make the sound clearer and more neutral, with better dynamics and a more analog flavor.
        7. The clock management design of the new architecture makes the clock work more stably, which brings higher transparency and more details.

Pure analogous Regenerative power supply :
            The regenerative power supply like a proprietary electric generator built in the unit.
             It can block most disturb from the power line , supply the ultra clean power supply for the audio amps , reproduce the most neutral and analog sound like audio signal for the system and the users.
             In the regenerative power supply design, the AC power through the regenerative input transformer , conversion to DC power ,through the class A PSUs power supply for the regenerative wave generator and driver stages .
             A balance regenerative regular wave generator produce the ultra low distortion 50Hz wave ,through the balance  gain amps and the strong  output stages , drive the regenerative transformers produce the clean AC power supply feed to the separate class A PSUs power supply for the L and R channel preamps .
            The class A parallel connection PSU has very high input impedance to avoid disturb through the PSU from affecting the signal parts and low output impedance with very fast speed and high linear,  it is a very clean power supply.
             Audio-gd on the regenerative power supply design points  :
             1, Through analyzed the AP SYS-2722 ,do a lot practises ,test and listen , full analog design of the regular wave generator have much lower distortion than the digital generator.
            2, Digital drive stages have higher efficiency , but full analog drive stages have much better analog sound like .
            3, 400Hz regenerative wave have higher efficiency , 50Hz regenerative wave had much far away the human ears sensitivity area than the 400Hz, boost the sound have much better analog sound like.



Pros and cons of PCM1704UK 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 while Delta-Sigma DA is much more sensitive to jitter.
          3. The output signal is much more precise compared to Delta-Sigma DA .
Weaknesses:
         1.THD today is extremely good with Sigma Delta chips; 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.

 

Importunacy of the FPGA/CPLD:
               
 FPGA stands for Programmable Array Logic. 
            Nowadays the FPGA is applied in a lot high end grade DACs; like the popular ROCKNA WAVEDREAM DAC. 
            We have applied the FPGA in our DAC products since 2008.
            HE-8 has built in 1 pc FPGA .
            The internal hardware design is fully controlled by complex software. A huge advantage is the fact the software in the FPGA can easily be upgraded offering new features or improve the performance. Such design is much flexible and future proof!

 

FPGA/CPLD tasks :
            1. The FPGA high performance SPDIF interface, replacing traditional  SPDIF interface chips like DIR9001, WM8805 or AK411X wich are lower in performance in comparison to FPGA.

            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!

           4. Simulate the tonality of vinyl disc playback through a unique design.


Fully discrete output stages
             
The signal last stage is the analog output stages, they can much effect the whole DAC sound quality.
           After d/a conversion by the PCM1704UK, the analogue signal is transported by fully discrete matched-transistor output stages.
           DC-coupled design with first class through-hole components. The high speed special ACSS output stages are non-feedback and current driven design.
          Special because almost all other designs need to convert the signal multiple times from and to current or voltage, resulting in less detail and less good staging.
          The output buffers  to reach very low output impedance. All output stages are in pure class A design without any (negative) feedback to achieve purest and a real live sound reproduction.
          The 4 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.



Heavy power supplies design:
            
 4 Uses high-performance R-core transformers with a total power of 160 W and more than 60,000 uF of audio-grade filtering capacitors to ensure the purity of the power supply.
          
The digital parts DC power is distributed by 12 ultra high speed low noise PSUs, they are group became the double stages PSUs . 
           The analog parts DC power is distributed by 8 groups pure class A PSUs power supply to the analog output amps, and 4 groups discrete serve PSUs  that performance can rival to battery power supply to the digital and analog of the DA modules separately  .
           The regenerate power supply parts has built in 2 groups pure class A PSUs .

           

Finishing touch:
 
            The HE-8 has completely separated power supplies .Digital, left and right analog channel have their own dedicated transformer. All boards and transformer compartment are separated by 5mm thick aluminum plates for high isolation degree.
               It improves the signal-to-noise ratio, isolate the harmonic interference and reduce noise, which will make the sonic background cleaner and blacker.
              The Left and Right analog parts are placed symmetric beside the digital board to keep the wires and distance identical to ensure equal output performance on both channels .

 

 

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