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Audio-GD R-8 MK2 (2021) - Truly Balanced Fully Discrete R2R Ladder DAC

R-8 MK2 feature:
It has been 3 years since the R-8 was launched in 2018. Thanks to the fully programmable circuits of the R-8, we have continuously updated the firmware to improve the owner experience.

The R-8 MK2 was designed and tested at the beginning of 2020, which was followed by a year of continuous audition, software and hardware fine-tuning.

Using the latest discrete servo stabilized power supply, whose performance is comparable to batteries after more than a year of calibration and optimization for each part of the circuit.

The DA parts use these new discrete servo stabilized power supplies, the analog circuits are still powered by pure class-A power supplies to achieve the best sound, as determined during listening tests.

In order to completely eliminate the influence of jitter in the incoming signal, the R8 MK2 uses an asynchronous clocking process.

First it reads and stores a considerable amount of signal source data to RAM, discard the clock of the signal source, and directly use the high-performance built-in Accusilicons to clock the output from the RAM. Since both data and clock are handled by the FPGA, the impact of transmission on jitter is neglectable. The jitter level is essentially the same as what is specified for the TCXO clocks used by the R8 MK2.

Because the local clock and the signal source clock are completely isolated and run independently, the traditional jitter measurement methods can not be applied, instead a special data acquisition circuit is required to evaluate its level. For human beings, the best test method is always through listening tests. A jitter-free sound is very realistic and natural, as clear as pure water, and very involving.

SPECIFICATIONS (OS8 mode tested, improvement may result in changes in specifications and design without notice.)
S/N Ratio: >120DB
Output impedance: <5 ohm (XLR ,RCA)
Output Level: 2.5V (RCA) ; 5V (XLR) ; 2+2MA (ACSS)
Frequency Response: 20Hz - 20KHz
THD: <0.01%
Input Sensitivity: 0.5 Vp-p ( 75 Ohms, Coaxial) ; 19 dBm (Optical) ; USB1.0 - USB3.0 ; RJ45 /HDMI : 3.3V
　
Support Operate Systems (USB): Windows, OSX, Linux, ISO

Support Sampling:
USB & IIS : 44.1kHz - 384kHz /32Bit DSD64-512
Coaxial mode: 44.1kHz - 192kHz
Optical mode: 44.1kHz - 96kHz

Power Requirement: Version 1: 100-120V AC 50/60 Hz, Version 2: 220-240V AC 50/60 Hz　
Power Consumption: 40W　
Package Weight: Approximately 12KG
Dimensions: W430 X L445 X H80 (MM, Fully aluminium )