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The Audio-GD R-8 MK3 is a high quality, balanced R2R DAC with an exceptional design that provides both musical and accurate sound reproduction.
In order to completely eliminate the impact of jitter on the incoming signal, the R-8 MK3 uses an asynchronous clock system. The asynchronous clocking system first reads and stores the source signal data in RAM, ignoring the clock signal, and uses the high-performance Accusilicon oscillators at the output of the RAM. Since the data and clock are managed by the FPGA, the impact of jitter is negligible. The key to this transmission method is to ensure data integrity for clear, natural sound reproduction.
This MK3 version of the R-8 has undergone a long period of testing, measuring, listening and adjusting at all levels of the circuit. It uses a stabilized power supply using discrete servos for battery-like performance. The converter stage uses this stabilized power supply, where analog circuits use a pure Class A power supply. The improvements and new features of the R-8 are as follows:
The R2R design has many advantages, the most obvious being:
The FPGA and the five CPLDs are largely responsible for the high sound quality provided by the R8-8 MK2. In particular, they are responsible for the following points:
The analog output stage is connected directly behind the DA-7 modules, without using SMD components. The high speed ACSS amplifier is used to amplify and process the signal. It uses a negative feedback design. The output buffer uses an unbalanced FET-based design, with each group connected in parallel for a lower output impedance. The DAC incorporates 4 AOPs to provide the DC servo function and therefore does not require a coupling capacitor, to avoid added noise or sound coloration.
The power supply stage of the R-8 MK3 is particularly impressive with 3 high performance R-Core transformers, for a total power of 135W and more than 30000µF of filter capacitors, ensuring a clean and stable electrical signal. The power supply for the digital circuits is distributed by nine low noise, high speed PSUs. The analog circuits use four groups of pure Class A PSUs to power the output amplifiers.
Specifications | |
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Product type | DAC |
Inputs | 1x HDMI (I2S) 1x USB (I2S) 1x XLR 1x BNC 1x Coaxial 1x Optical |
Outputs | 1x XLR 1x RCA 1x ACSS |
SNR | > 120dB |
Output impedance | < 5Ω (XLR, RCA) |
Output level | RCA : 2.5V XLR : 5V ACSS : 2+2mA |
Frequency response | 20Hz - 20kHz |
THD | < 0.1% |
Input sensitivity | Coaxial : 0.5Vp-p (75Ω) Optical: 19dBm USB / HDMI : 3.3V |
Compatible OS | Windows, OSX, Linux, ISO |
Supported sampling rates | USB, HDMI : PCM up to 32bit 384kHz, DSD up to DSD512 Coaxial : PCM up to 24bit 192kHz Optical : PCM up to 24bit 96kHz |
General | |
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Supply voltage | 220-240VAC 50/60Hz |
Consumption | 40W |
Weight | 12kg |
Dimensions | 430 x 445 x 80mm |
Package | 1x Audio-GD R-8 MK3 1x Power cable 1x USB A to USB B Cable 1x Sofware update kit |
Input | SPDIF |
Input | BNC |
Input | XLR |
Input | Optical |
Input | USB |
Output | XLR |
Output | RCA |
Output | ACSS |
DAC / ADC Chip | R2R LADDER DAC |
Max sampling rate | DSD512 |
Max sampling rate | 384kHz |
Color | Black |
Networking | No |
Remote Control | No |