Audio-GD R1 NOS

R-1 NOS edition
The NOS version of the Audio-GD R-1 benefits from new features and a number of improvements, with the aim of providing ever more precise and rich sound reproduction.

• New feature  In the R-1 NOS's digital processor, zero delay technology is applied, guaranteeing exact synchronization of data and clock, considerably reducing jitter.
• New feature The galvanic isolator is applied before the DA conversion and analog parts to cleanly isolate all digital inputs and their processors for a clean sound.
• New feature The DA-8 modules have been replaced by two DA-7 modules with 8 groups of R2R 24bit decoders and 4 DSD decoders operating in balanced mode.
• Update The use of the latest stabilized discrete servo power supply considerably reduces noise and helps reduce the heat generated by the R-1. The analog circuits remain powered by a Class A regulated power supply. A total of 8 PSU groups are integrated to power the various stages of the R-1.
• Update The design of the current signal transmission is entirely discrete, with no OPA in the signal path.

Discrete R2R DAC
A discrete R2R DAC is acknowledged to be superior to an integrated R2R chip assembly such as the PCM1704K or AD5791, offering a more natural high-midrange listening experience. The technical advantages are that R2R DACs filter out clock noise not found in analog signals and R2R DACs are less sensitive to jitter on 16bit definitions. The analog signal is theoretically more accurate than a DAC based on Delta Sigma technology.

An FPGA DSP processor
The FPGA DSP in the Audio-GD R-1 DAC overcomes the inaccuracy of resistors beyond 16/21bit. The result is high precision even in high definition 24bit 384khz. These technical qualities also include: better processing of SPDIF inputs (coaxial, optical) than the usual integrated interfaces (WM8505, DIR9001), thanks to faster computing power and FIFO buffer stages that drastically reduce jitter.

Pure Class A analog stages
Based on over 20 years of expertise, Audio-GD excels in creating analog stages without feedback. The R-1 DAC's output circuit benefits from this long and incisive research, with stages made entirely of sorted and matched discrete transistors. There are no surface-mounted components and a minimum of components in the signal path. The final buffer stages are made of high-bandwidth single-ended FET transistors on two parallel stages, guaranteeing low output impedance. This last part has no capacitors in the signal path. Of course, this converter also features high-speed, high-current ACSS outputs. In the spirit of "less is better", there are no relays on the analog circuit.

Low-noise, oversized linear power supply
A good DAC is nothing without a quality power supply producing the lowest possible parasitic noise. The R-1 features a triple-wound, low-radiation R-Core transformer for the digital, left and right analog stages. Each voltage is distributed over a total of 13 pure Class A regulation groups, producing very low noise and fast impulse response.

TECHNICAL SPECIFICATIONS