Detail of the Current Conveyor Technology
What's the regenerative power supply :
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.
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.
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
HE-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 , 32 Bit / 384KHz through I2S
and USB 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
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.
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.
HE-7 has built in DSP
processor, which is a Two-channel Digital Interpolation Filter and
data in-phase processor for digital audio. This Device offers
advanced features for high-performance digital signal processing (DSP)
applications up to 450-MHz. Data and Master-clock in-phase
processing are without jitters. So HE-7 can offer a clear
and focused soundstage, apart from accurate and neutral reproduction
of the recorded disc/music. The Stopband Attenuation up to -130DB,
enough clean the digital noise , avoid the digital noise degrade
on the back stage and make the sound like digital.
Stopband Attenuation: -130DB.
Passband Ripple: within
HE-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.
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.
HE-7 has complete separation of digital process, analog left, right
amplifier channels, regenerative drivers and transformer, even the 230V / 120V
power input lines had shield in the copper conduit.
HE-7 uses heavyweight all-aluminum chassis to prevent the
eddy current of transformers from interfering on circuit board.
Uses all audiophile grade
components, including DALE resistors, WIMA caps, custom
order NOVER (UK brand) caps, all audiophile grade input & output
sockets (Neutrik ) and gold IEC socket. HE-7 all parts of four channels had exact match before install.