AUDIO-GD R-8 Balanced DAC 4x R2R DAC Native DSD I2S ACSS Amanero FGPA Accusilicon

AUDIO-GD R8 Balanced DAC 4x R2R DAC Native DSD I2S ACSS Amanero FGPA
This Audio-GD R8 device of an extremely careful design takes the key points of its predecessor, the R2R7 of which it inherits all the musicality with a much more contained price.

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R8 AUDIO-GD

Discrete DAC Native DSD 32/384kHz, Discrete output, FGPA, & external settings panel


GD R8 Audio DAC balanced
 

This is 2019 version of D77. It is equiped with the last Accusilicon 318B oscillators to upgrade the DAC precision even further than with TCXO clocks.


This device with its extremely clean design inherits all the advantages from his précecesseur the R2R7 with all its musicality and in a lower price.
<br />This very high quality DAC uses discrete components technology. This belong to Audio-GD's field of expertise and allows the device to ignore jitter and digital noise, which is a priceless value when aiming for the most neutral sound, without digital coloration.

This is mostly a much more accessible version for the least DIY audiophiles since all digital settings (sync HDMI, PLL, OS / NOS ...) can now be adjusted from the front panel.

4 x dac modules

4 x DA-7 R-2R Audio-GD modules Integrated


R8 simultaneously uses four R-2R modules DA-7 to operate a decoding of rare finesse. This construction is particularly advantageous in that it decomposes the digital signal and "shares" it between a plurality of independent logic circuits.
In other words, the R8 is able to decode the 32 bits of the audio stream during a single clock cycle. Not only does this prevent accumulation of data loss due to interference but it also facilitates the critical stage of the reconstruction filter afterward.

With its construction in discrete component, the R2R technology has near zero sensitivity to jitter, unlike the increasingly widespread delta-sigma DACs. It means that the sound has very little coloration by the D / A conversion and the qualities of the source and the audio file emerge clearly.

FPGA logic circuit


The resistor network is corrected by a logic circuit FPGA. In this configuration, the conversion and reconstruction do not depend on the single analog tolerance electronic components that compose it, but takes account this very variability in the conversion process. This allows to enjoy all the "density" of the Full R2R in its most subtle details while maintaining excellent stability of the output signal.

The FPGA égalementi plays a direct role in the reception of the S / PDIF signals and processing for a result as good, if not superior to the usual modules such DIR9001, WM8805 or AK11X.

In parallel with a FIFO chip, the FPGA manages the entire reclocking from all entries, allowing a jitter suppression on all inputs.

Finally, the use of such a logic circuit gives the device the ability to offer various oversampling modes (2x, 4x, 8x and NOS) with the appropriate digital filters.

Audio GD R 8 FPGA
Galvanically isolated USB interface AMANERO

Isolated USB Amanero interface 384kHz / 32bit


The USB interface Amanero Combo 384 is an asynchronous design made to minimize as much as possible the need to resort to external noise sources. To do this, it works with a pair of low phase noise Accusilicon oscillators, a fine design when it comes to isolate the audio stream in all its clarity.

This is the second generation of Amanero interface enjoying a galvanic isolation against parasites from the USB source.

The interface has its own power supply, which eases the pressure and interference and allows to highlight the micro-details without over-treating the digital signal transmitted via USB by more dithering. This design thus preserves the sharpness of the pulse response, contributing to a deep soundstage with rigorously controlled dynamics.

The USB provides isolated Amanero DAC R8 USB interface capabilities on many audio formats such as 44.1 kHz to 384kHz / 32bit and DSD64 256.

Advanced supply stage


R 8 uses 3x high quality, low noise and low magnetic loss R-Core transformers as a power supply.

This represents a total of 130Watts of power available to power all digital parts and analog output stages.

The digital stages and receive current thanks to 13 high-speed power and low noise powering units. Output stages are powered by regulated power supply (10 units) operating in pure class A.

This construction allows all stage to operate from a clear and independent power, an essential condition to achieve superior audio quality.

DAC audio R8 GD Linear supply three transformers
R-8 Audio output stage GD 100% discrete (electronic components)

Discrete balanced output stage


The R8's output stage is constructed entirely with discrete components forming complementary transistors.

FETs mounted in parallel serve as buffer to provide a very low output impedance. This configuration makes the most of the power stage and operate all outputs in pure class A with no negative feedback, which plays a significant role on the overall sound quality.

A balanced ACSS output (Audio-GD technology with drive current by design and without feedback) is available.

The coupling is made through 4 operational amplifiers (instead of capacitors) for an extremely natural sound output. No other relay or switch separates the outputs of the circuit to maintain the signal its tinies details.

Connectivity

Dac panel input / output by R 8 Audio GD


The R8 Audio GD has all the connections necessary for integration into ambitious high-fidelity installations.

Respectively from left to right, the available inputs are AES / EBU, SPDIF Coaxial, Optical HDMI (I2S), USB (Amanero).

The output stage is divided into two separate stages. It offers RCA connectors, XLR and ACSS (balanced standard Audio-GD) ports.

Specifications
TypeDAC R2R
SNR120dB+
Output Impedance- the 5ohm
Output Level2.5V (RCA)
5V (XLR)
2+2MA (ACSS)
Frequency response20Hz-100Khz
THD- 0.0005%
Input sensitivity0.5 Vp-p ( 75 Ohms, Coaxial )
19 dBm (Optique)
USB1.0 - USB3.0
RJ45 /HDMI : 3.3V
Supported sampling frequencyUSB : 44.1kHz - 384kHz /32Bit DSD64-256
I2S : 44.1kHz - 384kHz /32Bit DSD64-512
Coaxial : 44.1kHz - 192kHz /24Bit
Optique 44.1kHz - 192kHz /24Bit
Power type220-240V AC 50/60Hz
Consumption40W
Weight12Kg
DimensionsL430 X l445 X H80
Housing100% aluminum
Parts supplied
DAC R8x1
Power cablex1
USB cablex1
 
Data sheet
InputSPDIF
InputI2S via HDMI
InputUSB Amanero
InputOptical
OutputXLR
OutputRCA
OutputACSS
DAC ChipR2R LADDER DAC
Max sampling rateDSD256
Max sampling rate384kHz
ColorBlack
Components / ChipDAC R2R
MaterialAluminium
 
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Average votes
5.0 / 5
2 reviews
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 5/5
Date :
Juste plus que parfait
J'ai eu plusieurs Dacs, avec chaque fois une montée en gamme et en qualité.
C'est mon eme Audio-gd R2-R, le dernier étant le R1.
Le R1 semblait a mes oreilles le dac parfait et j'en ai dit le plus grand bien.
Par curiosité et pour voir si le principe de la loi Pareto était juste, je me suis lâché et investi dans ce R8 qui coûte presque le double.
La différence de prix est elle justifiée ?
Sans équivoque, la réponse est : largement OUI !

Le R1 est trés bon, mais le R8 est trés trés bon.

Comme si Mr plus était passé par là...meilleure image stéréo, encore plus de micros détails, plus fin dans les hautes fréquences etc etc.

Et puis quel beau bébé de 11kg, j'ai ôté le capot pour voir l'intérieur, c'est magnifique, ca respire le sérieux et on voit le travail de la belle ouvrage !

Il va de soit que pour apprécier une telle bête il faut une excellente source, un trés bon ampli et des enceintes capables de restituer toute cette qualité.

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This review has been posted for AUDIO-GD R-8 Balanced DAC 4x R2R DAC Native DSD I2S ACSS Amanero FGPA Accusilicon
Note :
 5/5
Date :
dac au top
je ne vais pas entré dans les détails.
juste dire qu'il remplace un atoll dac 200 et qu'il lui est supérieur en tout points.
ma config :audio gd r8 /audio gd master 9 /mr speakers ether c
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This review has been posted for AUDIO-GD R-8 Balanced DAC 4x R2R DAC Native DSD I2S ACSS Amanero FGPA Accusilicon
 
AUDIO-GD R-8 Balanced DAC 4x R2R DAC Native DSD I2S ACSS Amanero FGPA Accusilicon
This Audio-GD R8 device of an extremely careful design takes the key points of its predecessor, the R2R7 of which it inherits all the musicality...

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