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Audio-GD R-28 (2022 Edition) Full Upgrade Version

Digital input signal sampling display and simulate vinyl record sound flavor
Fully Balance Discrete Transistors Headamp And Preampamps All In One
Built in real balanced headphone amp max output power achieve 9500 mW that can drive most headphone easy.
8 group fully discrete R-2R DA modules to combine into real balanced push/pull decoders.
4 group fully discrete real balanced DSD native decoders.
Fully discrete real balanced current transmition design.
2 pc ultra high frequency 90/98 MHz Accusilicon 318B femtosecond clocks provide synchronous clock for whole unit without PLL up-frequency .
32bit / PCM384K /DSD512 asynchronous transfer Amanero 384 apply the FPGA synchronous clock.
The whole digital circuit built with 1 pc FPGA and 5 pc CPLD programmable chipsets to separate the different configured circuits for avoid interrupt, data process in parallel mode.
Support firmware update to improve on sound quality.
All digital process mode settings accessible by buttons on front (No need to open the chassis).

Specifications
(Tested by OS8 mode and already through sound tuned, 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

THD+N: <0.01%

Gain
L mode : +12DB
H mode : +22DB

Channels imbalance: < 0.05DB

Frequency Breadth
20Hz - 20KHz (<- 0.5DB)
　
Output Level
Headphone output : 19V RMS (balance)
Preamp Variable output : 19V RMS (balance)
DAC Fixed output : 5 V RMS (balance)
　
Headphone amp output power level (Balanced Mode)
(Only for headphone over 15 ohms.)
9500mW / 25 ohm
8000MW / 40 ohm
3500MW / 100 ohm
1200MW / 300 ohm
600MW / 600 ohm
　
Output impedance
1 ohm / Headphone output
5 ohm / DAC / Preamp output

Input Sensitivity
0.5 Vp-p (75 Ohms, Coaxial)
19 dBm (Optical)
　
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
1 Version 100-120V AC 50/60 Hz, 2 Version 220-240V AC 50/60 Hz

Power Consumption: 35W

Package Weight: Approximately 8.5KG

Dimension: W 360mm X L 360mm X H 85mm (Fully aluminium)

Accessories: AC power cord X1, USB cable X1