AUDIO-GD R-1 2021 R2R DAC DSP FPGA USB Amanero HDMI I2S 384Khz 2x Accusilicon

Édition 2021

Le Audio-GD R-1 dans sa version 2021 profite de nouvelles fonctionnalités ainsi que de certaines améliorations, dans le but de fournir une restitution sonore toujours plus précise et riche.

[New feature] The USB input transmits the I2S signal to the FPGA processor and receives the clock signal from it for a more accurate signal and better sound quality.

[Update] The FPGA processes data in parallel. This mode of transmission allows only one clock cycle to be required for data processing or transmission, thus avoiding any clock stability problems. The I2S inputs (USB and HDMi) operate in double 32bit, the SPDIF input operates in double 24bit and the DSD input in double 64bit. The parallel transmission mode allows an overall improvement of the sound quality and transparency.

[Update] New configuration and clock management for greater accuracy.

[Update] Improved DSD asynchronous clock technology.

[Update] DoP support from SPDIF input.

Discrete DAC R2R

A discrete R2R DAC is known to be superior to an integrated R2R chip setup like PCM1704K or AD5791 offering a more natural listening acumen. The technical advantages are: The R2R DACs filter the noise of clocks that are not found on the analog signal. The R2R DACs are less sensitive to jitter on the 16bit definitions. The analog signal is theoretically more accurate than a DAC based on Delta Sigma technology.

DSP FPGA processor

The DSP FPGA installed in the DAC AUDIO GD R2R 2 allows to overcome the inaccuracy of the resistances beyond 16/21 bit. We thus benefit from anot high precision even in High Definition 24 bit 384khz. These technical qualities are also: better processing from the SPDIF (coaxial, optical) inputs than the usual integrated interfaces (WM8505, DIR9001) thanks to faster computing power and FIFO buffer stages reducing the jitter drastically

analog stages in pure class A

Based on an expertise of over 20 years, kingwa designer AUDIO GD excels in creating analog stages without counter-reaction. The output circuit of the DAC R2R 2 benefits from this long research work incressant with stages entirely discrete transistors sorted and paired. There are no surface components and minimal components on the signal path. The last buffer stages are single-ended FET-type transistors with two-stage parallel bandwidth guaranteeing a low output impedance. this latter part has no capacitors in the signal path. Well-on this converter has high-speed outputs with high-current ACSS stage. There is no relay on the analogue circuit in the pure spirit "less is better".

Oversized linear power supply with low noise

A good DAC is nothing without a quality power supply that produces the lowest possible parasitic noise. R1 has a low radiation R core type transformer with triple winding for the digital, analog left and right stages. The distribution of each voltage is done on a total of 13 pure class A control units producing very low noise and a fast impulse response.

Specifications
DAC	R2R
Digital Input Sensitivity	0.5V pp (75Ω Coaxial), 19dB on Toslink optics Td>
Distortion rate per harmonic	0.003% over 20 to 20kHz unweighted
Bandwidth	20 to 20kHz Td>
Output Voltage Level	2.5V (RCA), 2MA (ACSS)
Signal Ratio	108dB
Output impedance Td>	10Ω (RCA) Td>
Adjustment oversampling from front panel	X2, x4, X8
Non Over Sampling Mode (NOS)	Front panel
USB and HDMI LVDS I2S	PCM 44.1kHz - 384kHz to 16-32bits Td>
USB and HDMI DSD	DSD64 to DSD256 Td>
Input SPDIF Coaxial Td>	24bits max 44.1kHz-192kHz
Input SPDIF Optical Td>	24bits max 44.1kHz - 96kHz
USB Compatible	Windows 7, 8, 8.1, 10 (requires a driver), MAC OS 10 and Linux
Clocks	2x Accusilicon + 2x Crystek
Power supply	Linear power supply with 3 secondaries with 5 groups, low noise regulation in pure class A
Dimensions	240 x 320 x 80mm
Weigth	5kg
Accessories	1x USB Cable, 1x IEC Cable

Specifications

DAC

R2R

Digital Input Sensitivity

0.5V pp (75Ω Coaxial), 19dB on Toslink optics Td>

Distortion rate per harmonic

0.003% over 20 to 20kHz unweighted

Bandwidth

20 to 20kHz Td>

Output Voltage Level

2.5V (RCA), 2MA (ACSS)

Signal Ratio

108dB

Output impedance Td>

10Ω (RCA) Td>

Adjustment oversampling from front panel

X2, x4, X8

Non Over Sampling Mode (NOS)

Front panel

USB and HDMI LVDS I2S

PCM 44.1kHz - 384kHz to 16-32bits Td>

USB and HDMI DSD

DSD64 to DSD256 Td>

Input SPDIF Coaxial Td>

24bits max 44.1kHz-192kHz

Input SPDIF Optical Td>

24bits max 44.1kHz - 96kHz

USB Compatible

Windows 7, 8, 8.1, 10 (requires a driver), MAC OS 10 and Linux

Clocks

2x Accusilicon + 2x Crystek

Power supply

Linear power supply with 3 secondaries with 5 groups, low noise regulation in pure class A

Dimensions

240 x 320 x 80mm

Weigth

5kg

Accessories

1x USB Cable, 1x IEC Cable

Input	Optical
Input	BNC
Input	SPDIF
Input	HDMI
Output	XLR
Output	RCA
Output	ACSS
DAC / ADC Chip	R2R LADDER DAC
Max sampling rate	DSD256
Max sampling rate	192kHz
Color	Black
Networking	No
Remote Control	No

Excellent !
Après 9 ans passé en compagnie d'un Audio-gd NFB 2.32, je ne voyais pas d'autre alternative que de le remplacé par un autre Audio-gd
Comme stipulé dans d'autre commentaires, en terme rapport performance prix, difficile faire mieux. Neutralité, nuance et restitution précise, mais plus analogique que chirurgicale...Donc plus naturel sont au rendez-vous. Il y avait déjà de ça dans mon ancien DAC et c'est pour cela que je suis resté chez ce fabricant.

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