AUDIO-GD R-8HE Balanced Discrete 4x R2R DAC Regenerative Power Supply 32bit 384kHz DSD512

AUDIO-GD R-8 Balanced DAC 4x R2R DAC Native DSD I2S ACSS Amanero FGPA Accusilicon
This R-8HE, with its extremely careful design, takes up the key elements of its predecessor, the R-7HE, whose audio quality it inherits, while seeing its performance revised upwards and its price reduced. In the R-8HE, there are 4 Ladder DAC modules, this time in version 2, as well as the regenerative power supply.

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Audio-GD R-8HE

Balanced Discrete 4x R2R DAC Regenerative Power Supply 32bit 384kHz DSD512

Audio-GD R-8HE DAC R2R Symétrique Discret Alimentation Régénérative 32bit 384kHz0 DSD

This R-8HE, with its extremely careful design, takes up the key elements of its predecessor, the R-7HE, whose audio quality it inherits, while seeing its performance revised upwards and its price reduced. In the R-8HE, there are 4 Ladder DAC modules, this time in version 2, as well as the regenerative power supply. These two elements, at the heart of the device, allow it to offer great transparency, high dynamics and incredible sound richness, with a reproduction close to what can be offered by analog.

The R-8HE also includes surface components, making it possible to reduce the price of the device without degrading its audio quality, and therefore making it more accessible to buy a DAC with a regenerative power supply.

In addition, the R-8HE has completely separate power supplies. The digital circuit and the analog left and right channels each have a transformer. The signal circuit and transformers are separated by 5mm thick Aluminium plates, ensuring a high level of insulation. This improves SNR, isolates harmonic interference and reduces noise. The left and right channels are placed completely symmetrically so as to maintain the distance travelled by the cables equal on each side. The R2R DA conversion modules are placed between two Aluminium plates to avoid RF interference.

Seamless components and connectivity

Like many Audio-GD products, the R-8HE includes an Amanero USB interface, supporting PCM resolutions up to 32bit 384kHz and up to DSD 512. The device has 5 inputs: Coaxial, Optical, HDMI I2S, USB and XLR. Each input has interfaces adapted to provide the highest sound quality. On the output side, the R-8HE offers XLR, RCA and ACSS.

R2R 4x DA-7 V2 Design

The R-8HE, like its big brother, is a DAC R2R, a design that has become popular thanks to its undeniable sound qualities, especially when integrated into high-end products. While there are several methods for designing a DAC R2R that impact both performance and design complexity, Audio-GD continues to choose the highest quality as usual.

The design chosen by the brand switches ultra-low tolerance resistors in parallel and an ultra-fast FPGA chip controls and corrects the Ladder R2R. This design corrects each bit to achieve incredible performance. In addition, with this parallel structure, a single clock cycle allows all data to be processed, where a series connection would require 8 to 24. Audio-GD also corrects imperfections in basic R2R assemblies, i. e. those caused by resistance tolerance, through the use of the integrated FPGA.

Main advantages of the DAC R2R Ladder discrete:

  • The R2R does not convert the clock signal into the output signal.
  • R2R is not sensitive to jitter, unlike Delta-Sigma.
  • R2R provides a more accurate output signal than Delta-Sigma.

Regenerative Power Supply

The regenerative power supply is an electrical generator directly integrated into the device and avoids any noise from the main power supply and thus provides an ultra-low noise AC signal to power the device. It regenerates the main power supply and blocks the noise of the electrical signal to obtain the most neutral sound.

First, a transformer converts the main voltage. The DC conversion is carried out by Class A power supplies. A discrete symmetrical regenerative wave generator produces an ultra-low distortion wave at 50Hz.

Symmetrical amplifiers, with powerful output stages, drive regenerative transformers to produce extremely clean alternating current. This totally clean signal is then routed to separate Class A power supplies for the left and right channels.

The Class A DC power supply with an input impedance will avoid any noise and allow the amplification stages to have a low output impedance.

In addition, the 4 R-Core transformers provide 225W of power to the system and Nover capacitors with a capacity of more than 60000µF are used to ensure a fluid current.

Audio-GD R-8HE DAC R2R Symétrique Discret Alimentation Régénérative 32bit 384kHz0 DSD
Audio-GD R-8HE DAC R2R Symétrique Discret Alimentation Régénérative 32bit 384kHz0 DSD

Ultra fast signal processing

An FPGA chip is a programmable component that is now regularly found in high-end DACs. It allows total control of the internal hardware via a complex software layer. A huge advantage of using an FPGA is that its software layer can be easily updated to add new features or improve the overall performance of the device. This allows the device to be upgraded without necessarily having to replace components. It is both a high-performance and flexible solution.

In R-8HE, in this case, the FPGA is responsible for :

  • Excellent performance of the SPDIF interface, replacing less efficient traditional interfaces such as DIR9001, WM8805 or AK411X chips.
  • Total re-clocking process with FIFO design applicable to all inputs. In this way, the output data is always fully synchronized with the clock signal, thus limiting jitter.
  • The integration of 2X, 4X and 8X oversampling filters, digital filters and 4 different NOS modes.

Discrete symmetrical analog output stage

After the digital-to-analog conversion by the dedicated R2R modules, the analog signal is transported to the discrete symmetrical stages using paired discrete transistors. The analog sections have no surface components, only discrete components. The output buffers are asymmetric FETs. Two parallel stages provide very low impedance and all output stages have a pure Class A design so that there is no non-feedback. From a sound point of view, this translates into an absolutely disconcerting neutrality. Four AOPs work like a DC Servo, so that no coupling capacitors are required and the DC output is automatically polarized. The output stage also has ACSS outputs for even greater detail and definition. Finally, the circuit does not integrate any relays or switches after the digital/analog conversion modules, in order to maintain the purest possible reproduction.

Audio-GD R-8HE DAC R2R Symétrique Discret Alimentation Régénérative 32bit 384kHz0 DSD

ACSS

Audio-GD has its own technological signature, called ACSS for Audio-GD Current System Signal. Thanks to the firm's expertise and know-how, this technology offers a less colourful, more detailed sound, and an unparalleled neutrality. Each of the brand's technical engineers is, in addition to being experienced, a Hi-Fi and audio enthusiast like you and us.

Easy to use

As with all its latest products, and unlike previous generations, the adjustment of filters and modes is done simply by using the buttons and the screen on the front of the device, where it used to be necessary to open it. In the same perspective of simplifying the use of the R-8HE, Audio-GD integrates a Micro USB port on the back of the device allowing easy firmware updates.

Audio-GD R-8HE DAC R2R Symétrique Discret Alimentation Régénérative 32bit 384kHz0 DSD

Oversampling & NOS Filters

Oversampling Filters
Mode 0Mode NOS
Mode 22x Oversampling
Mode 34x Oversampling
Mode 48x Oversampling
NOS Filters
Mode 1Easiest data processing
Mode 2FIFO data
Mode 3Fastest data processing

Technical characteristics

Specifications
Product typeR2R DAC
SNR> 120dB
Output impedance< 5Ω (XLR, RCA)
Output levelRCA : 2.5V
XLR : 5V
ACSS : 2+2MA
Input sensitivityCoaxial, 75Ω : 0.5Vp-p
Optical: 19dBm
Supported OSWindows, OSX, Linux, ISO
Supported sampling rateUSB / I2S : PCM up to 32bit 384kHz, Native DSD up to DSD512
Coaxial : PCM up to 24bit 192kHz
Optique : PCM up to 24bit 192kHz (most optical sources only support up to 96kHz)
Inputs1x USB-B
1x I2S LVDS HDMI
1x Optical
1x Coaxial
Outputs1x XLR
1x RCA
1x ACSS

General
Consumption65W
WeightApprox. 19kg
Dimensions (LxPxH)430 x 450 x 125mm
Case materialAluminium
Package1x Audio-GD R-8HE
1x Power cable
1x USB Cable

THD

Audio-GD R-8HE DAC R2R Symétrique Discret Alimentation Régénérative 32bit 384kHz0 DSD
 
Data sheet
InputXLR
InputOptical
InputUSB-B
InputUSB Amanero
InputSPDIF
InputI2S via HDMI
InputUSB 2.0
OutputXLR
OutputRCA
OutputACSS
DAC ChipR2R LADDER DAC
Max sampling rate384kHz
Max sampling rateDSD512
ColorBlack
Components / ChipDAC R2R
MaterialAluminium
Channel2 channels (Stereo)
 
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AUDIO-GD R-8HE Balanced Discrete 4x R2R DAC Regenerative Power Supply 32bit 384kHz DSD512
This R-8HE, with its extremely careful design, takes up the key elements of its predecessor, the R-7HE, whose audio quality it inherits, while...

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