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[★ Our Review] https://starspickeraudio.net/blogs/blog/audio-gd-he-9-mk2-amp-he-1-mk2-new-generation-flagship-headphones-amp-amp-preamp-big-size-big-sound
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Audio-GD HE-1 MK3 (with Regenerative Power Supply)
Audio-GD HE-1 LE (Linear Power Edition)

What's different between HE-1 LE and HE-1 MK2:

The HE-1 LE and HE-1 MK2 have share the exact same analog board. The most different is the HE-1 MK2 has built in regenerate power supply that can filter all power line interrupt, feed the cleanest power to the analog boards.
The HE-1 LE has built in the linear power supply, benefit from the built-in pure class A PSUs that can offer the quite clean power to the analog boards.
If customer want the best sound quality, choice the HE-1 MK2.
If customer want to get the best rate of performance and price, or already own the good enough external power processor, choice the HE-1 LE.

HE-1 summarize :
Built in regenerative power supply
Fully balanced class A design built by discrete analog stages without any OPA or coupling caps in the signal channels.
Non- feedback ACSS analog output stage.
Uses three R-core transformers (In total 260W ) and more than 100,000uf audio grade NOVER capacitors are used to ensure ample and smooth power delivery.
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.
Supper Exponential Volume Characteristic, easy match the volume with different power amp and speaker .
5 analog inputs: RCA X2, XLR X2, ACSS X1 ( Even with RCA or XLR inputs, the output still had ACSS aviable)
3 outputs: XLR / RCA / ACSS (They can connect 3 units power amp simultaneously)

What's the 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.

Specifications
S/N Ratio
>130DB

THD
<0.0005 %

Frequency Band (XLR input)
20Hz - 20KHz ( +/- 0DB )
20Hz - 200KHz ( <4DB )

Volume characteristic
100 steps Supper Exponential Volume Characteristic

Gain
+10DB

Output Level (Max)
9.5V @ RCA
19V @ XLR
4.8MA @ ACSS

Output Impedance
10 ohm @ XLR
>10M ohm @ ACSS

Input Impedance
94K ohm @ XLR
<5 ohm @ ACSS

Channels cross
< -130DB

Channels imbalance
< 0.01DB

Power Requirement
1 Version 100-120V AC 50/60 Hz
2 Version 220-240V AC 50/60 Hz

Power Consumption
70W Class A @230V or 120V

Transformer Power
260W (3 unit transformers)

Package Weight
Approximately 19KG

Dimensions
W430 X L450 X H125 (MM, Fully aluminium)

Accessories
Power cord X1