USED Audio-GD - HE9 Regenerative PSU Balanced Pre / Headphone Amplifier (RCA, XLR, ACSS)
Audio-GD HE9 discrete, balanced pre- and headphone amplifier with regenerative power supply.
This is a trade-in device in like-new condition. Original packaging and a one-year warranty.
HE-9 applies ultra-low distortion single stage ACSS amplifier and soldered directly on the motherboard. A fully class A, discrete, balanced preamp / headphone amp with regenerative power supply.
Aluminium remote control included
| Brand: Audio-GD |
| Product Type: Headphone Amplifiers |
Audio-GD – HE 9 Headphone / Preamplifier
- The output of the pre-amplifier now incorporates output buffers to improve the sound quality of the preamp output.
- Dual volume control to perfectly match the different output levels of your sources.
- The two modules for the left and right channels are now completely identical and are factory matched for perfect sound consistency.
SUMMARY
- Built in top class regenerative discrete power supply
- Fully balanced pure 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.
- Total applied 8 pcs exact matching 150W transistors ( In total 1200W ) .
- A total of 9 groups of PSU’s for dedicated DC supply.
- Uses most Hi-end grade parts and exactly matched transistors, OCC wires.
- 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 very high headphone / speaker without change the gain mode.
- 20dB gain can drive the low sensitivity headphone very well.
- Static storage mode control software for avoid disturb sound quality , the MCU output once control data and save in the perform parts ,then stop output data until users next operation.
SPECIFICATIONS | |
|---|---|
| Product type | Headphone amplifier / Preamplifier |
| SNR | > 130dB |
| THD | < 0.0025% |
| THD+N | < 0.0025% |
| Frequency response (XLR) | 20Hz – 100kHz (< 4dB) |
| Max output level | XLR : 19V RCA : 9.5V ACSS : 6MA |
| Input impedance | XLR : 94KΩ ACSS : < 5Ω |
| Output impedance | Preamp XLR : 10Ω Balanced headphone output : 2Ω |
| Balanced headphone output power | 15W @ 25Ω 10W @ 40Ω 4W @ 100Ω 1350mW @ 300Ω |
| Single-ended headphone output power | 4W @ 25Ω 2500mW @ 40Ω 1000mW @ 100Ω 350mW @ 300Ω |
| Crosstalk | < -130dB |
| Transformer power | 260W (3 transformers) |
| Gain | High gain : +20dB Low gain : +10dB |
| Volume control | 100 steps Exponential curve |
| GENERAL | |
|---|---|
| Consumption | 66W (Class A) |
| Weight | 20kg |
| Housing material | Aluminum |
| Color | Silver or Black |
| Dimensions | 430 x 485 x 123mm |
| Display | Multilevel LED |
| Package | 1x Audio-GD HE-9 MK3 1x Power cable 1x Metal Remote |
HIGH PRECISION VOLUME CONTROL
Volume control consist of relay-controlled attenuators. Fully-independent, fully-balanced stereo volume controls. The volume controls feature consist of high-precision 0.05% tolerance film resistors and golden contact relays. Buffered inputs and outputs.There 4 channels volume boards are built in the unit to achieve ultimate balanced volume control. They are controlled by a digital signal controlling the high quality relays switching the precision resistors in analog area.
Quality of volume control is very important in balanced applications . It have to effectuate the four channels to work as synchronous as possible to keep the balanced signal in perfect shape. In traditional volume controls the balanced output will introduce distortion which will negatively influence sound quality and performance and might even get worse than a single ended setup and waste the advantages of balanced designed solution.REGENERATIVE POWER SUPPLYAn integrated regenerative power supply is a proprietary electric generator built into the unit to avoid any noise from main power and deliver ultra-low noise and clean AC wave to feed the preampIt will regenerate the main power and block noise from the power line, this way the preamp is able to reproduce the most neutral and analog sound you can imagine.First a transformer converts main voltage. DC conversion is done by class A PSUs power supplies.A discrete balanced regenerative wave generator produces the new ultra-low noise wave form at 400Hz. The 400Hz frequency was chosen because they have better efficiency compared to traditional 50Hz and at this frequency, 400Hz, it will boost the sound to reproduce real and pleasant analog sound.The balanced gain amps with powerful output stages are driving the regenerative transformers to produce the extreme clean AC power. The extreme regenerated clean AC power is send to separate class A PSUs power supplies for both left and right channel.The discrete class-A DC power supply with high input impedance will avoid any noise and allow the amplifier stages to have low output impedance at very high speed and linear at frequency spectrum.
REGENERATIVE POWER SUPPLY
An integrated regenerative power supply is a proprietary electric generator built into the unit to avoid any noise from main power and deliver ultra-low noise and clean AC wave to feed the pre-ampIifier will regenerate the main power and block noise from the power line, this way the preamp is able to reproduce the most neutral and analog sound you can imagine.First a transformer converts main voltage. DC conversion is done by class A PSUs power supplies.A discrete balanced regenerative wave generator produces the new ultra-low noise wave form at 400Hz. The 400Hz frequency was chosen because they have better efficiency compared to traditional 50Hz and at this frequency, 400Hz, it will boost the sound to reproduce real and pleasant analog sound.
The balanced gain amps with powerful output stages are driving the regenerative transformers to produce the extreme clean AC power. The extreme regenerated clean AC power is send to separate class A PSUs power supplies for both left and right channel.The discrete class-A DC power supply with high input impedance will avoid any noise and allow the amplifier stages to have low output impedance at very high speed and linear at frequency spectrum.
