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Audio-GD R7 MK2 / R-7 MK2 - Fully Discrete Truly Balanced R2R Ladder DAC + Unique Jitter Elimination Technology

Fully discrete parts are used in a truly balanced current transmission design.
4 sets of fully discrete and independent DSD hardware decoders.
8 sets of fully discrete R-2R DA modules to form a two-channel balanced push-pull decoder.
2 top-notch Accusilicon TCXOs with frequencies of 90 and 98MHz provide synchronization for the whole unit, and they are applied to the playback of all data rates without PLL up-conversion.
32bit / 384K asynchronous Amanero USB interface synchronized with the FPGA. USB and HDMI modules equipped with galvanic isolators and fed by two groups of independent isolated power supplies, to avoid the mutual electrical contamination between USB and HDMI.
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 digital circuit uses these new discrete servo stabilized power supplies, while the clock and the analog circuits are still powered by pure class-A power supplies to achieve the best sound, as determined during listening tests.
The digital circuits of the whole DAC are comprised of 1 FPGA and 7 CPLDs (both programmable devices), which allow separating the different functional circuits and preventing interference.
The FPGA operates in the parallel data processing mode even at the fastest data rate, and supports firmware upgrades to improve sound quality when new and better design ideas are eventually found and implemented.
The input signal sampling rate is displayed.
Support of external 10MHz clock input (default is 50 ohms, can be customized to 75 ohms ).
All digital mode settings can be changed on the front panel live.
A firmware upgrade port is featured on the rear panel of the machine (no need to open to take off the cover to upgrade the firmware).

SPECIFICATIONS
(Tested by OS8 mode, we always improve for better real like, musical and analog sound, 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
Support Operate Systems (USB): Windows, OSX, Linux, ISO

Support Sampling:
USB / I2S mode: 44.1kHz - 384kHz /32Bit
USB / I2S mode: DSD native 64-512
AES & Coaxial mode: 44.1kHz - 192kHz /24Bit
Optical mode: 44.1kHz - 192kHz /24Bit (Most optical sources only support up to 96K 24BIT)

Power Requirement: Version 1: 100-120V AC 50/60 Hz ; Version 2: 220-240V AC 50/60 Hz
Power Consumption: 23W
Package Weight: Approximately 15KG
Dimensions: W430 X L430 X H93 (MM, Fully aluminium )