Audio-GD – HE-7 MK3 – 8xPCM1704U-K Regenerative PSU Balanced DAC

AUDIO-GD HE-7 MK3 PCM1704U-K DAC

Crafted with precision and passion, this DAC boasts an 8x PCM1704U-K ultimate PCM DAC design, ensuring unparalleled audio fidelity and resolution. Every note, every nuance, is faithfully reproduced with breathtaking clarity and detail.  Experience the power of pristine sound with our regenerative power supply, eliminating unwanted noise and distortion for a pure audio experience that transports you into the heart of the music. With a discrete servo stabilized power supply dedicated to feeding the digital circuits, you can trust that every signal remains clean and stable, free from interference or degradation. Convenience meets performance with the included remote control, allowing you to effortlessly tailor your listening experience from anywhere in the room. Elevate your audio journey with the Audio-GD 8x PCM1704U-K Ultimate PCM DAC, where innovation and craftsmanship converge to deliver audio excellence beyond compare.

The DAC consist of 3 tuned low noise, low flux leakage, R-cores transformers. In total 130W power to supply all digital parts and the left and right analog boards. The DC power is distributed over 19 separate power regulators. All are pure class A low noise shunts; fed by 3 groups linear power supplies. Resulting in ultra-high speed and clean power for all individual parts. Audio-GD has developed an advanced current-driven amplifier technique. Also known as ACSS, Audio-GD Current System Signal. This special technique ensures that the signal travels a much shorter path and that ensures a more transparent, faster and more neutral reproduction. A similar technique is used by, for example, KRELL. The Current Conveyor technology mostly components are the current mirror. The Current Conveyor technology isn’t a new technology, at 1966 , professor K.C. Smith and A.S.Sedra publish the concept “current mode analogue circuits “.

The analog output stages play a crucial role in shaping the final sound quality, and in our design, they receive meticulous attention. Following digital-to-analog conversion by the R2R D/A modules, the analog signal is passed through fully discrete matched-transistor output stages, utilizing a DC-coupled design with top-tier through-hole components. We refrain from using SMD components in the analog section, ensuring optimal performance and reliability.

Our high-speed, unique ACSS (Audio-gd Current Signal System) output stages operate without feedback and are driven by current, distinguishing them from other designs that often require multiple conversions between current and voltage, resulting in a less detailed and transparent soundstage. The output buffers consist of single-ended FETs, employing two stages in parallel to achieve very low output impedance. All output stages operate in pure class A without negative feedback, ensuring the purest and most lifelike sound reproduction.

To maintain signal integrity, the 4 OPA op-amps are equipped with DC servos, eliminating the need for coupling capacitors and automatically biasing the DC output. The result is a strikingly transparent and neutral sound that faithfully captures the essence of the original recording, allowing the listener to immerse themselves in the music like never before.

SPECIFICATIONS

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 preamp. It 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.