AUDIO-GD R-28 2022 EDITION DAC R2R DSD Natif Amanero / Preamplifier / Headphone amplifier

AUDIO-GD R-28 DAC FULL LADDER DSD Natif Amanero / Preamp / Headphone amplifier
The R-28 Audio-GD is an all-in-one unit of rare versatility that merges in a single housing a very high quality full R-2R DAC with a discreet balanced preamplifier and a high precision headphone amplifier.

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Shipping date: 08-12-2021.

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AUDIO GD R-28 2022 - accusilicon - crystek

DAC R2R DSD Natif Amanero / Preamplifier / Headphone amplifier

Audio GD R28 Amanero native DSD All in one
 

This is 2022 version of R-28. It is equiped with the last Accusilicon 318B oscillators to upgrade the DAC precision even further than with TCXO clocks.
This model also has 2 Crystek Clocks on the Amanero USB interface.
This version uses two transformers, which are isolated from each other.


The R28 Audio-GD is an all-in-one unit of rare versatility that merges in a single housing a very high quality full R-2R DAC with a discreet balanced preamplifier and a high precision headphone amplifier. This extremely comprehensive element can make every audio device found in a sound installation benefit from Audio GD expertise. Several sources (including analog) can be connected, giving the R-28 a  potential to become a real cornerstone of any ambitious audio system; facilitating wiring and connections while ensuring a rigorous and clean signal processing regardless of the source. Its compatibility with the most advanced audio formats, plus its pannel of inputs and outputs provide impressive interoperability with all equipment and the most popular fild of digital audiophile world.

2022 Edition 

The Audio-GD R-28 in its 2022 version benefits from new features as well as certain improvements, with the aim of providing an ever more precise and richer sound reproduction.

      • [New feature] Digital input signal sampling display and simulate vinyl record sound flavor.
      • [New feature] USB transmit the IIS signal to the FPGA processor and receive the clock signal from the FPGA processor, the USB interface without on board data clocks, the signal transmit is much exact, the sound quality get the much improve , close to the last generative R-28 combine with DI-20 (But not DI-20HE) level.
      • [Update] The FPGA processes data in parallel mode so that only one clock cycle is required to process and transmit a data frame.
        The I2S input (including USB and HDMI input) has been combined to switch to dual 32bit parallel. The SPDIF input after decoder has been combined to dual 24bit parallel. The DSD input has been combined to dual 64bit parallel.
      • [Update] Revised and improved clock configuration for better synchronization.
      • [New feature] Use of asynchronous DSD clock technology.
      • [New feature] The SPDIF input now supports DoP.
      • [New featurePower supply with two independent transformers.
4 modules 8 bits fonctionnen

Fully R-2R discrete conversion stage 

This stage is divided into four DA-8 modules working in parallel. This design is able to process an entire 32 bit digital signal during a single clock cycle, preventing a potentially audible accumulation of inaccuracies and allowing a single bit correction scale (rather than by multiple bits scale). This will play a significant role in achieving a high dynamic range (including a SNR> 120dB) while keeping distortion and jitter at an extremely low level.

This design is particularly interesting for it lowers the sensitivity to jitter to a virtually insignificant amount as regard to ordinary Sigma Delta DAC. Clock noise, parasites of digital / analog conversion and other unwanted frequencies that may give rise to distortion or aliasing are treated with tremendous efficiency, which increases the performance at all subsequent levels of the chain.

Digital circuit built for audio quality

Altera FIFO TCXO Audio GD reclocking clock noise rejection

The digital circuit of R28 uses specifically selected and assembled quality components to maximize the understanding and decoding of the audio stream. A TCXO clock, a logic circuit FPGA Altera and an Xilinx input circuit owner on FIFO chip are working together on all digital inputs.

In this configuration, the FPGA can reclock the clock signal through the FIFO design on the rate of its own internal clock, which allows a more efficient rejection of clock noise and corrects digital imperfections accumulated from the audio source.

This digital circuit not only provides digital filtering of high quality, but it also incorporates an integrated oversampling function (x2 / x4 / x8) as much as 4 NOS modes (real NOS with analog filter 6dB). The unit is user configurable to comply with listening preferences as to the specificities of the rest of the audio system.

Isolated Amanero USB interface  384kHz / 32bit 

DAC audio interface with GD Amanero 384 USB combo

The USB interface Amanero Combo 384 is an asynchronous design very efficient to minimize noise generated from external sources. To do this, it works with a pair of low phase noise TCXO oscillators. A fine design with very good results when it comes to isolating the audio stream in all its clarity.

This Amanero interface is fully isolated against audio parasite through the USB circuit. 

The interface has it own internal power-supply, which eases the pressure and lower interferences to highlight the micro-details without over-treating the digital signal transmitted via USB by an unclear dithering. This design thus preserves the sharpness of the impulse image and allows a deep soundstage with rigorously controlled dynamics.

In addition, through this interface, the R-28 is able to access the PCM format 44.1 / 48 / 88.2 / 96 / 176.4 / 192 / 352.8 / 384kHz and DSD 2822 Mhz, 3,072 / 5,644 / 6,144 MHz

Discrete balanced analog output & ACSS

Audio Output R 28 GD ACSS DAC symmetric

The analog output stage of R-28 is composed of several amplification stages, each of them completely discrete and based on matching transistor pairs. 4 pairs of transistors 15W provide excellent ability to drive the signal.

True to the tradition of Audio-GD, R-28 has an analog current output ACSS Mini XLR completely protected from feedback and with very low output impedance. This unique design is prized for its fine detail and for its superior sound stage in the final restitution.

The device has an integrated volume control operating on 4 channels. These are controlled by digital signal and control resistors for analog setting. Resistors KOA / Vishay work in parallel to provide a tolerance of 0.05%.

It is possible to bypass the preamplifier with a single button on the rear of the housing in order to output the sound DAC as it is and output to an external controller.

Effective power supply stage

Audio GD R28 high-quality audio power

The R28 operates high quality R-Core transformer, low noise and low magnetic noise. This supply is divided into 11 groups that are themselves selected for their ultra-high speed and ultra-low noise.

A double stage technology ensures the continuity and the cleanliness of the signal towards all digital stages.

Moreover, the analog amplification stages takes advantage of two pure class supply blocks A.

Versatile connectivity panel

USB DAC coaxial ACSS optical SPDIF rca usb HDMI aes ebu rca

Bringing together the audio sources, R-28 has a full hyper-connectivity that will greatly facilitate its integration into all types of sound installations, starting with the most ambitious.

There is an HDMI input (I2S), USB, Optical and Coaxial, but also analog inputs RCA and XLR that will bring together digital and analog sources on this same device to allow a greater control from a single device.

As regards to outputs, R-28 is equipped with an RCA connectivity / ACSS and XLR (balanced). All these options ensure maximal interoperability despite its high technical level.

Release symmetric and asymmetric helmet

Output modes and integrated headphone amplifier




The  DAC / HP button controls output mode. This allows to switch between the following modes:

- P: output by XLR / RCA / ACSS  (rear). The XLR and RCA connectors can be connected simultaneously to two separate amplifiers.

- H: front output on headphone

- S: super unbalanced output (raise the output power to achieve a similar level to a balanced circuit. Not recommended  with balanced helmet.).

Aluminum remote control included


The device is delivered with a massive aluminum remote control of the most beautiful effect. It allows you to comfortably control the basic functions of the R-28 without having to move around or disturb your listening experience.

Specifications
TypeR-2R DAC
Headphone amplifier
Preamplifier
InputsDigital: HDMI (I2S) / USB / Optical / Coaxial
Analog: RCA / XLR
OutputsRCA / XLR / ACSS
SNR>120dB
THD total<0.002%
THD (integrated amplifiers)0.0003% @ 0dBV
GainL : +7dBH : +17dBF : +17dB
volume controlYes (100 high levels Exponential)
Balancing channels<0.05dB
Frequency response20Hz-20kHz1Hz - 140kHz (-3dB single amplifier)
Output LevelHeadphone output 19V RMS
Variable preamp output: 10V RMS
DAC output variable: 5V RMS
Headphone Output Power9500mW / 25 Ohm
8000mW / 40 Ohm
3500mW / 100 Ohm
1200mW / 300 Ohm
600mW / 600 Ohm
Output ImpedanceHeadphones: 1 Ohm DAC / preamp: 5 Ohm
Input Sensitivity0.5Vp-p (75 Ohm Coaxial) 19dBm (Optical)
Support OSWindows (with driver), OSX, Linux, ISO
Freq. SampleUSB : 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz , 192kHz, 352.8kHz,384kHz
COAX : 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz ,192kHz
OPTIQUE : 44.1kHz, 48kHz, 88.2kHz, 96kHz
Power Supply220-240V AC50/60Hz
Power consumption33W
Weight7.5kg
Dimensions360 x 360 x 85 mm
Housingaluminum
AccessoriesPower cable x1
USB cable x1
Aluminium remote control x1
 
Data sheet
InputI2S via HDMI
InputXLR
InputOptical
InputRCA
InputSPDIF
OutputXLR
OutputRCA
OutputACSS
DAC / ADC ChipR2R LADDER DAC
Max sampling rate384kHz
Max sampling rateDSD512
ColorBlack
NetworkingNo
Remote ControlYes
 
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Average votes
4.5 / 5
4 reviews
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Note :
 5/5
Date :
petite soirée entre amis
j ai invité 4 amis à passer une soirée spéciale casque audio.
Des passionnés comme moi, chacun d entre eux ont pris leur casque ampli; casque et dac .
quelle soirée...
ça a fini presque à 3 h00 du matin.
En casque audio , on a le focal Elegia et Clear, le Grado, Beyer dynamic 770etamiron ,le Denon d7200,Hifi man deva, Sennheizer 650et 800, le Meze99.
Ampli dac :Advance px1 , Atol hd120, Cambridge 200m ,Xduoo ta10 et Audio gd r28
difficile de dire comme ça qui est le meilleur.
Il y a quand même des différences de son et de qualité.
Par contre, on s est rendu compte que des produits se marient bien ensemble.
Dans mon cas, j ai l audio gd et le focal Elegia et Sennheizer 650.
Au final, le focal parait presque le plus mauvais de tous .
Bref une claque, lorsque j ai entendu le Meze99 et surtout le Denon qui sera mon futur achat.
Mais l audio gd est quand même et reste sur le haut du podium
tout avis confondu .
j ai passé une super belle soirée , et on compte refaire cette échange, et surtout cette convivialité.
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This review has been posted for AUDIO-GD R-28 2022 EDITION DAC R2R DSD Natif Amanero / Preamplifier / Headphone amplifier
Note :
 3/5
Date :
que dire...
Pas de notice , une vulgaire caisse en carton .
déchirée de l intérieur. Bref je me pose des questions .
nouveau nouveau ou déjà exposé...
le produit en lui même semble neuf .
C est sur que j achète tout les mois ce genre de produit.
en principe je suis très méticuleux ,et c est pour moi
un honneur lorsque je revends un accessoire ou appareil dans un état showroom.
Pour ce qui est du reste , tout fonctionne parfaitement .
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This review has been posted for AUDIO-GD R-28 2022 EDITION DAC R2R DSD Natif Amanero / Preamplifier / Headphone amplifier
Note :
 5/5
Date :
Oo amazing
Venant d'un Topping DX7s, le choc est brutal.
Ce R2R demande du rodage, mais en sortie de boite, il montre clairement qu'il ne joue pas dans la même cours.
L'appareil fait son poids, construction solide et sérieuse. Ecoute exclusivement au casque, branché en XLR et alimenté par un PC avec HQ Player, Mode NOS et en avant la musique !
Sans aucun réglage, il y a de la musicalité à revendre, du détail, du naturel, de la profondeur...Bref, je confirme tous les éléments qui vous pouvez lire sur cet appareil et sur le R2R en général.
L'ergonomie est tout de même à améliorer, mais rien d'insurmontable. De plus, on ne passe pas sa vie dans les réglages non plus.
J'ai joué un peu avec les mode OS & NOS, effectivement, et je me retrouve aussi dans les divers commentaires : Plus de largeur sonore, mais petite perte de naturel en OS (Sympa sur l'électro par exemple le mode OS).
Bref, un DAC qui pour, certes un prix assez conséquent, vous fais du bien aux oreilles. Avec le R28, sur certains titres que je pensais connaitre par cœur, j'ai eu l'impression de complément découvrir un nouveau morceau...Comme une perte de repère : "Tiens bizarre, c'est pas du tout comme d'habitude.".
Bref, je voulais vraiment du changement, passer d'un DAC Delta Sigma à du R2R et monter en gamme...Le résultat est au dessus de mes attentes...Il coche toutes les cases.
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This review has been posted for AUDIO-GD R-28 2022 EDITION DAC R2R DSD Natif Amanero / Preamplifier / Headphone amplifier
Note :
 5/5
Date :
Un dac tout en un haut de gamme
Acheté il y a 3 semaine et donc un peut de recul .Quelle claque à l écoute un dac de très haute qualité et un ampli casque excellent avec beaucoup de puissance et une musicalité hors paire .Un appareil très riche en connexion ce dac ampli casque possède un rapport prix musicalité audiophile de grande qualité que l on trouve rarement dans cette gamme de prix MF
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This review has been posted for AUDIO-GD R-28 2022 EDITION DAC R2R DSD Natif Amanero / Preamplifier / Headphone amplifier
 
AUDIO-GD R-28 2022 EDITION DAC R2R DSD Natif Amanero / Preamplifier / Headphone amplifier
The R-28 Audio-GD is an all-in-one unit of rare versatility that merges in a single housing a very high quality full R-2R DAC with a discreet...

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