AUDIO-GD R-7 Balanced R2R DAC FPGA 2x TCXO I2S HDMI Amanero 32bit 384kHz DSD512

AUDIO-GD R-7
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The Audio-GD R-7 is a high-end DAC based on a discreet R2R symmetrical design with optimized high-speed Ladder correction using the FPGA FIFO as a buffer and reclocker. As usual, for the design of the R-7 Audio-GD, Audio-GD chooses to integrate the best components into its device for exceptional performance.

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Audio-GD R-7

AUDIO-GD R-7 Balanced R2R DAC FPGA 2x TCXO I2S HDMI Amanero 32bit 384kHz DSD512

The Audio-GD R-7 is a high-end DAC based on a discreet R2R symmetrical design with optimized high-speed Ladder correction using the FPGA FIFO as a buffer and reclocker. As usual, for the design of the R-7 Audio-GD, Audio-GD chooses to integrate the best components into its device for exceptional performance. There are WIMA and NOVER capacitors, DALE and Vishay resistors or KOA transistors. The architecture of the DAC, particularly well designed with a low noise power supply stage or a discreet analog output stage, allows for a very rich sound reproduction. In addition, the R-7 includes Amanero USB or I2S LVDS inputs to support DSD / DxD files and PCM sampling rates up to 32bit 384kHz.

audiogd-r7-inpage6.jpg
Audio-GD R7 R2R Ladder

R2R Design

The R-7 is a DAC R2R, a design that has become popular thanks to its undeniable sound qualities, especially when integrated into high-end products. While there are several methods for designing a DAC R2R that impact both performance and design complexity, Audio-GD continues to choose the highest quality as usual.

The design chosen by the brand switches the ultra-low tolerance resistors in parallel and an ultra-fast FPGA chip corrects the R2R scale. This design allows you to control and correct each bit distinctly to achieve incredible performance. In addition, with this parallel structure, a single clock cycle allows all the data to be processed, where a series connection would require 8 to 24. Thanks to this architecture, Audio-GD allows its R-7 to correct imperfections in basic R2R assemblies, i.e. those caused by resistance tolerance.

Main advantages of the DAC R2R Ladder discrete:

  • The R2R does not convert the clock signal into the output signal.
  • R2R is less sensitive to jitter.
  • R2R provides a more accurate output signal.

Easier usage

While the brand has been accustoming us for a while to filter settings made using switches under the hood of its devices, it now offers improved ergonomics by offering to make these settings directly from the front of the device. Indeed, buttons allow you to simply choose the active filter, without any need to remove the device. The R-7 offers 4 filters in NOS mode and 3 filters in Oversampling mode. In the same perspective of simplifying the use of the DAC, Audio-GD integrates a Micro USB port on the back of the device allowing easy firmware updates.

Audio-GD R7 Réglages en façade
Audio-GD R7 FPGA

Ultra fast signal processing

FPGA chips, now widely used in the audio world, allow full control of the hardware by a software layer. One of the major advantages of this technology is the ability to easily perform updates, thus allowing the device to be improved without necessarily having to replace components. It is therefore both an efficient and flexible solution.

In the R-7, the FPGA is responsible for 3 major points:

  • The FPGA acts as an excellent high-performance SPDIF interface, much more efficient than a conventional chip.
  • It allows a complete re-clocking with a FIFO design applicable to each input. In this way the output data is fully synchronized with the clock signal to greatly reduce jitter.
  • The FPGA also includes 2x, 4x and 8x oversampling, digital filters and 4 different NOS modes.

Discrete symmetrical analog output stage

After the Digital to Analog conversion by the dedicated modules, the analog signal is transported to the discrete balanced output stages using paired FET Class A transistors. The analog sections have no surface components, only discrete components. This diagram allows to obtain a system without any feedback (non-feedback) and a very low output impedance. From a sound point of view, this translates into an absolutely disconcerting neutrality. This output stage also has ACSS analog outputs for even higher detail and definition.

Audio-GD R7 étage de sortie analogique discret

Power supply

The R-7's impressive power stage consists of 3 R-Core transformers with low noise and low flow leakage. A total of 130W of power is therefore used to power all the digital parts as well as the left and right analog channels. The DC signal is distributed to 19 low noise shunt controllers via 3 linear power supplies. Such a large power supply stage provides the entire system with its own signal and thus contributes to the sound quality of the device.

Oversampling & NOS Modes

The R-7 offers several Oversampling or NOS (Non-Oversampling) modes. If you wish to choose Oversampling, simply select the value "O". If you want to choose the NOS then you have to choose the value "N". You can then select one of the following modes to adapt the playback to your listening experience.

Oversampling modes
Mode 0NOS Mode
Mode 22x Oversampling
Mode 44x Oversampling
Mode 88x Oversampling
NOS Modes
Mode 1Simplest data processing
Mode 2FIFO Data
Mode 3Faster data processing

Technical characteristics

Specifications
Product typeDAC R2R
SNR> 120dB
Output impedance< 5 Ohm (XLR, RCA)
Output levelRCA : 2.5V
XLR : 5V
ACSS : 2+2MA
Frequency response20Hz - 20kHz
THD< 0.0005%
Input sensitivityCoaxial 75 Ohm : 0.5Vp-p
Optical : 19dBm
HDMI : 3.3V
Supported OS (USB)Windows, OSX, Linux, ISO
Sampling rateUSB, I2S : 32bits 44.1kHz - 384kHz / DSD 64-512
Coaxial, Optical : 24bits 44.1kHz - 192kHz
Inputs1x Coaxial RCA SPDIF
1x Coaxial BNC SPDIF
1x Optical Toslink
1x I2S LVDS via HDMI
1x USB Amanero
1x XLR
Outputs1x Balanced ACSS
1x Balanced XLR
1x Single-Ended RCA
General
Consumption48W
Dimensions430 x 430 x 93mm
Housing material100% Aluminium
ColorNoir
Accessories1x Power cable
1x USB cable
 
Data sheet
InputUSB-B
InputSPDIF
InputI2S via HDMI
InputI2S via RJ45
InputUSB 2.0
InputUSB Amanero
InputOptical
InputBNC
OutputRCA
OutputACSS
OutputXLR
Max sampling rateDSD512
Max sampling rate384kHz
ColorBlack
 
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AUDIO-GD R-7 Balanced R2R DAC FPGA 2x TCXO I2S HDMI Amanero 32bit 384kHz DSD512
The Audio-GD R-7 is a high-end DAC based on a discreet R2R symmetrical design with optimized high-speed Ladder correction using the FPGA FIFO as a...

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