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AUDIO-GD R-8 2021 Balanced DAC 4x R2R DAC Native DSD I2S ACSS Amanero FGPA Accusilicon
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This product has been replaced by the new version, the AUDIO-GD R-8 MK2 DAC R2R.
AUDIO-GD R-8 2021
Discrete DAC Native DSD 32/384kHz, Discrete output, FGPA, & external settings panel
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.
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.
2021 Edition
The Audio-GD R-8 in its 2021 version benefits from new features as well as certain improvements, with the aim of providing an ever more precise and richer sound reproduction.
- [New feature] The USB and HDMI inputs use separate isolators and an isolated power supply to avoid possible interruptions to the stream from your computer or HDMI source.
- [New feature] The USB input uses a bi-directional isolator that can transmit the I2S signal to the FPGA processor and receive the clock signal from it for accurate transmission of the data stream.
- [New feature] The HDMI input has its own isolator for better sound quality.
- [New feature] Use of asynchronous DSD clock technology.
- [New feature] The SPDIF input now supports DoP.
- [Update] The FPGA processes data in parallel mode so that only one clock cycle is required to process and transmit a data frame.
The I2S input (including USB and HDMI input) has been combined to switch to dual 32bit parallel. The SPDIF input after decoder has been combined to dual 24bit parallel. The DSD input has been combined to dual 64bit parallel. - [Update] Revised and improved clock configuration for better synchronization.
FULL UPGRADE version
AUDIO-GD R8 2021
Full upgrade version
AUDIO-GD R8 2021
regular version
Horloges
Accusilicon Clocks
TCXO Clocks
USB Interface
Amanero USB interface Galvanic isolation Separate power for USB
Amanero USB interface
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.
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.
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
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 | |
|---|---|
| Type | DAC R2R |
| SNR | 120dB+ |
| Output Impedance | - the 5ohm |
| Output Level | 2.5V (RCA) 5V (XLR) 2+2MA (ACSS) |
| Frequency response | 20Hz-100Khz |
| THD | - 0.0005% |
| Input sensitivity | 0.5 Vp-p ( 75 Ohms, Coaxial ) 19 dBm (Optique) USB1.0 - USB3.0 RJ45 /HDMI : 3.3V |
| Supported sampling frequency | USB : 44.1kHz - 384kHz /32Bit DSD64-256 I2S : 44.1kHz - 384kHz /32Bit DSD64-512 Coaxial : 44.1kHz - 192kHz /24Bit Optique 44.1kHz - 192kHz /24Bit |
| Power type | 220-240V AC 50/60Hz |
| Consumption | 40W |
| Weight | 12Kg |
| Dimensions | L430 X l445 X H80 |
| Housing | 100% aluminum |
| Parts supplied | |
|---|---|
| DAC R8 | x1 |
| Power cable | x1 |
| USB cable | x1 |
| Input | Optical |
| Input | SPDIF |
| Input | I2S via HDMI |
| Output | RCA |
| Output | ACSS |
| Output | XLR |
| DAC / ADC Chip | R2R LADDER DAC |
| Max sampling rate | DSD256 |
| Max sampling rate | 384kHz |
| Color | Black |
| Networking | No |
| Remote Control | No |
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