The R28 Audio-GD is a unit of rare versatility, combining the high-quality R-2R DAC, discreet balanced preamp, and high-precision headphone amplifier into one package. Thanks to this extremely comprehensive element, all audio devices present in the sound installation can benefit from the Audio GD experience. The ability to connect multiple sources (including analogue) allows the R-28 to become a true cornerstone of any ambitious audio system, simplifying wiring and connection, while providing rigorous and clean signal processing regardless of the source. Compatibility with the latest audio formats and a large number of inputs and outputs provide impressive compatibility with any equipment and the most popular fields in the digital audiophile world.
The NOS version of the Audio-GD R-28 features new features and enhancements designed to provide even more accurate and rich sound reproduction. As the name suggests, this version of the R2R R-28 DAC operates in NOS (Non Over Sampling) mode. Its design is specially optimized for this purpose. It does not require a main clock signal to operate, thereby avoiding excessive jitter. Technology integrated directly into the R-28 NOS digital processor ensures precise data and clock synchronization. In addition, galvanic isolation is used to isolate the digital inputs from the digital processor, ensuring clear and accurate sound reproduction.
The analog output stage of the R-28 consists of several amplification stages, each of which is completely discrete and built on matched pairs of transistors. 4 pairs of 15W transistors provide excellent signal control ability.
True to Audio-GD tradition, the R-28 features an ACSS Mini XLR analog current output that is completely feedback-proof and has a very low output impedance. This unique design is prized for its fine detail and superior soundstage in the final restoration.
The device has a built-in volume control that operates on 4 channels. They are controlled by a digital signal and control resistors for analogue tuning. KOA/Vishay resistors operate in parallel to provide 0.05% tolerance.
It is possible to bypass the preamp using a single button on the rear panel of the case to output the DAC audio in its original form and output it to an external controller.
The R28 uses a high-quality R-Core transformer that has low noise and low magnetic interference. This power supply is divided into 11 groups, which are themselves selected for their ultra-high speed and ultra-low noise.
Dual-stage technology ensures signal continuity and purity across all digital stages.
In addition, the analog amplification stages take advantage of two pure Class A power supplies
. By combining audio sources, the R-28 is fully hyper-connective, making it much easier to integrate into any audio installation, from the most ambitious.
In terms of outputs, the R-28 is equipped with RCA/ACSS and XLR (balanced) connectors. All these options ensure maximum compatibility, despite the high technical level of the device.
The R28’s digital circuitry uses specially selected and assembled quality components to maximize understanding and decoding of the audio stream. All digital inputs share the same functionality as the TCXO clock, the Altera FPGA logic, and the Xilinx input circuit owner on the FIFO chip.
In this configuration, the FPGA can recalculate the clock signal through the FIFO design to the frequency of its own internal clock generator, which makes it possible to more effectively suppress clock noise and correct digital imperfections accumulated from the sound source.
This digital circuit not only provides high quality digital filtering, but also includes a built-in oversampling function (x2 / x4 / x8), as well as 4 NOS modes (real NOS with 6dB analog filter). The device is configured by the user in accordance with the preferences of listeners and the features of the rest of the audio system.
The device comes with a massive aluminum remote control of the most beautiful appearance. With it, you can conveniently control the main functions of the R-28 without moving or interfering with your listening experience.
This stage is divided into four parallel operating DA-8 modules. This design is capable of processing an entire 32-bit digital signal in a single clock cycle, preventing potentially audible accumulation of inaccuracies and allowing the correction scale to be used on a single bit (rather than multiple). This will play an important role in achieving high dynamic range (including SNR > 120 dB) while keeping distortion and jitter extremely low.
Loading ...