CD-7 HE

Redbook disc transport
Built in regenerative power supply
Employs a Philips CDM-4 swing-arm laser
Built in HDMI-IIS, AES, BNC and RCA coaxial output ports
Built in 10MHz external clock input port
　

Price: USD2830   ( Exclude shipping cost . Include metal remote controller that  need two AAA batteries support by users .)  
 
Please send your address, name  to audio-gd@vip.163.com get the quote.

Black and silver chassis versions are available. Please specify your preference when placing the order; otherwise, units will be shipped randomly.
 

      The HDMI‑I²S output of CD‑7 HE supports four configurable formats (the unit’s top cover needs to be removed for adjustment). Customers may advise us of the HDMI‑I²S input format of their DAC when placing orders, and we will configure it prior to shipment. If no specification is provided, the unit will be preset to Format 1.
                 Format 1                                Format 2                               Format 3                              Format 4
     

Important Pre-Purchase Notice:
        1,The CD‑7 HE is equipped with a CDM‑4 laser featuring fixed laser power. We have tuned it to the optimal power level. The laser power will not be increased for improved disc reading performance, as higher power causes signal distortion which degrades sound quality and shortens the service life of the laser.
       Consequently, for heavily soiled or scratched CDs, players fitted with later-generation laser assemblies (such as CDM12 or DVD lasers ect. ) or units with artificially boosted laser power may be able to read such discs, whereas the CD‑7 HE may fail to play them.
       The unit reliably reads clean, minimally scratched original CDs.
       This design approach enables an exceptionally long service life for the CDM‑4 laser.
       2, The CD‑7 HE is a pure transport without an integrated DAC.  It must be connected to an external DAC for audio playback.
　

What’s New in CD‑7 HE:
       1, Built‑in regenerative power supply delivers extremely clean power, reproducing abundant sonic details with transparency while preserving musicality.
       2, Equipped with an on‑board programmable FPGA implementing a high‑performance S/PDIF demodulator in hardware, instead of conventional dedicated demodulation ICs such as DIR9001, WM8805 and AK411X series.
       3, Utilises Accsilicon AS318B 45.1584 MHz femtosecond oscillator. The 11.289 MHz clock signal is generated via FPGA processing, achieving approximately 12 dB improvement in phase noise compared to the raw oscillator output.
      The attached diagram is the Accsilicon AS318B 45.1584 MHz femtosecond oscillator original output specification.
   

       4. Clock and FIFO technologies are implemented on output data to achieve precise synchronization between data and clock signals, providing immunity to jitter.
      5, Four HDMI‑I²S output formats are offered for improved compatibility with the vast majority of DACs globally. Format conversion is processed inside the FPGA without external mechanical switches, avoiding distortion of signals and clock induced by mechanical switches.
      6, A built‑in ultra-high-speed wideband isolator isolates the digital processing circuitry from output buffer circuits. It prevents digital noise from propagating to the external DAC and impairing sound quality.
      7, The external clock input also features an integrated ultra-high-speed wideband isolator, which prevents ground current noise from the external clock system degrading the purity of the reference clock signal.
      8,To deliver the cleanest possible power supply, the unit is equipped with 17 built-in regulated power supplies, categorized as below:
              A: 1 set of pure Class A regulated power supply for HDMI, AES and coaxial output buffer circuits.
              B: 2 sets of pure Class A regulated power supplies for the regenerative power circuitry.
              C: 4 sets of DC servo power supplies for the RF stage, DSP, FPGA and other digital processing circuits.
              D: 10 sets of high-speed linear power supplies for the remaining circuitry.

The regenerative power supply :
           While audio is life , the Power supply is water , Pure water create the wonderful life ,clean power supply reproduce the beautiful sound .
           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 CD-7HE, 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 .
         The class A parallel connection PSU has very high input impedance to avoid disturb through the PSU from affecting the degree of purity of the regenerative signal ,  and it has low output impedance with very fast speed and high linear,  it is a very clean power supply.
           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 two regenerative transformers produce the clean AC power .
          The two regenerative transformers feed the AC power to the digital processors and output buffer stages seperatly.
         
          Audio-gd on the regenerative power supply design points  :
          1, Through analyzed the AP SYS-2722 , 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.