Wisdom in mind,   enthusiasm at heart.

Home Products Warranty Shop Contact Us Shipment Chinese


HE-9 MK3

Regenerative power supplyy work as private electric generator
Real Balanced ACSS Pure Class A headamp and Preamp



Note: The manufacturing process and design can be updated and upgraded at any time so internal and external changes to the actual product can occur without notification.
Summarize Use Manual Specs Custom Option Shipping Cost

Price: USD2590  ( Exclude shipping cost . Include combo remote controller that can control the HE9 MK3 and some lot audio-gd latest DAC models . It need two AAA batteries support by users .)  
Organic glass top board price  : USD30
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-9 MK3 Black
HE-9 MK3 Silver

The different between HE-9 MK2 and HE-9 MK3:
       Their different is the chassis and display , others just same.

What's new in the HE-9 MK3:
         The first generation HE-9 released in 2015 years.
         Since 2016 years , some lot customers asked me , do you have plan to upgrade HE-9?
         The analog circuits design is slower develop compare to the digital design. Especial the excellent design.
         In our product upgrade policy, we don't want declare the upgrade edition but just change the chassis or re-arrange the inside , no real upgrade on the design and sound quality.
         Since the first generation HE-9 released, we have not change its design , we always like to upgrade the design but we can't .
         After 5 years, in the 2021 years we spent the long term test and audition, now we are release the new version, it apply the perfect layout technology,   sound quality improve obviously, better detail and dynamic but more analog sound, no harsh anymore, and the functions also upgrade:
         1, The preamp output has built in the exclusive output buffers that can improve the sound quality of the preamp output .
         2, It has double volume control can match well with the different output level sources.
         3, The new design apply the same board of Left and Right channels that make the design exact same,that we can measure and match the boards for assemble in the one unit to ensure the consistency .

HE-9 MK3 summarize :

Unique fully analog regenerative power technology just like built in a private electric generator that offer the most clean power supply , boost the sound quality more transparency but analog , much better than the external digital technology power processor , not to say the passive LC power filter outlet .
Unique real non-feedback ACSS headamp applies four channels of  non-feedback output stages composed of 8 pieces of  transistors, every piece has 15A/150W performance. The capacitance of the whole machine reaches as high as 60,000uF. Four R-core transformers are used with total power of 260W.
The preamp output has built in the exclusive output buffers that can improve the sound quality of the preamp output .
Separate class A PSUs power supply for regenerative drivers and audio signal amps .
Four-channel 100 steps digitally controlled relay-based volume control avoids channel imbalance and improves sound quality.
Four-channel 9 steps digital controller relay-based pre-volume control can control the source input level from 0DB to -9DB.
Two gain modes, high gain has 20DB and low gain has 10DB, which is more flexibility for the different gain power amp .
5 analog inputs:  RCA X2, XLR X2, ACSS X1 ( Even with RCA or XLR inputs, the output still had ACSS aviable)
3 pre amp outputs:   XLR / RCA / ACSS
4 headphone amp outputs: 6.3MM / 4 pins XLR / 3 pins XLR *2

Detail of the Current Conveyor Technology

Unique fully analog regenerative power technology:
             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 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 , 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.


Unique real non-feedback ACSS headamp/preamp technology:
           HE-9 MK3 built in a true balanced design applying the newest ACSS design . It seems complex , but in fact they are the most simple design the world has ever had , their a lot components to process the power supply. The HE-9 MK3 built in amp only has a single " voltage" gain stage to process signals, but works in ACSS mode so in fact it is a current gain stage instead of voltage gain stage, whereas normal OPA chips already include two or three voltage gain stages. The simplest and shortest signal journey brings out the most neutral and least colored sound.
           HE-9 MK3 applies ultra-low distortion single stage ACSS amplifier and soldered directly on the motherboard . The gain stages and the diamond cross output stage working on pure class A state.
           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 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.
           All signal gain is in current, achieved by the unique, superb open-loop multiple output current mirror. Incomparably precise and ultra-low distortion in the gain signal is the result. The signal path is balanced throughout and all transistors work in class A mode.
          HE-9 MK3 applies four channels of  non-feedback output stages composed of 8 pieces of  transistors, every piece has 15A/150W performance. The capacitance of the whole machine reaches as high as 60,000uF. Four R-core transformers are used with total power of 260W.

Unique I/V conversion volume control technology:
           The volume control is also different from conventional technology. Conventional volume control technology is
the volume control implement in the analog amp input stage through a volume pot to reduce the signal  . The volume pots quality effect the sound quality direct , the low quality volume pot cause lost the detail and channels imbalance cause the soundstage distortion  . Even the high performance volume pot ,in the attenuation then gain the signal mode ,still cause the detail lose and cause the S/N worst .
       In the HE-9 MK3, we applied the I/V conversion volume control , the volume control just  a variable passive I/V conversion place at the ACSS amp output , where the output is the current signal, not the voltage signal. The volume control is I/V conversion, and the volume depends on the current (I) conversion to the voltage (V). (Like R-2R D/A chips output passive I/V conversion)  It can keep the signal frequency band flat and not lost any detail. It can't degrade on sound quality in every volume level . After the volume , there are diamond cross output stage offer the very low output impedance  .
            The volume control quality is much important in the real balance gear . It must guarantee the four channels signal control exact to achieve the performance of the real balance gear .  If the cool and hot of the balance signal can't guarantee exact, the balance output will has large distortion cause the sound quality and performance even much worst than a single end gear , waste the  balance gear  design and the cost.
            In HE-9 MK3 is applied a four channels digital control relays based volume control, through changing the tolerance 0.05% resistors to control the volume for avoid channels imbalanced ,achieve the best performance and sound quality of the gear.
            HE-9 MK3 have 100 steps volume control, applied Supper Exponential Volume Characteristic, easy match the volume with different power amp and speaker .
While change the volume, the different relays break or close, it may had slightly switch sound on output and disappear while stop change the volume.

Supper Exponential volume characteristic    The Volume steps comparison to normal volume knob       
         HE-9 MK3 has complete separation of left, right amplifier channels, regenerative drivers and transformer, even the 230V / 120V power input lines had shield in the two thick aluminum boards .
         HE-9 MK3 uses heavyweight all-aluminum  chassis to prevent the eddy current of transformers from interfering on circuit board. 




版权所有:          何庆华  睿志音响

Copyright(C) 2004   www.audio-gd.com    All Rights Reserved