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Audio-GD - R7HE - Regenerative PSU / Balanced R2R Ladder FPGA DAC (DSD, DxD, Amanero USB)

Common price: € 3.799 Our price: € 3.647
€ 3.014 excl VAT
Coaxial RCA Input (Replace BNC)Information
Singxer F1 USB (Replace Amanero) with installationInformation
Power cable (Default C13 EURO)
Audio-GD - Optical Digital Toslink Cable (1M)Information
Audio-GD - Digital SPDIF coax interlink BNC (1m)Information
Audio-GD - Digital SPDIF coax interlink RCA (1m)Information
Audio-GD - ACSS Analogue balanced interlink (mini-xlr)Information
Audio-GD - Analogue RCA interlink stereo pair (1m)Information
M-WAY - ACSS NTRL Reference Analogue balanced interlink (mini-xlr)Information
M-Way - NTRL Reference Analogue balanced XLR interlink (3-PIN XLR)Information
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  • Description
  • Specifications

Audio-GD - R7HE 2018 - Regenerative PSU Discrete R2R (PCM & DSD/DxD Balanced DAC)

Balanced discrete R-2R digital analogue converter equipped with advanced high speed ladder correction including optimized FPGA FIFO buffering and re-clocking. Power by an analogue Regernative PSU  All parts and components are selected based on excellent sonic and measurements performance. Components used are e.g. WIMA caps; DALE and Vishay resistors, KOA transistors and NOVER capacitors. The design (e.g. low noise power supplies; discrete analogue output stages) were being selected after many years of experience and practices and are considered to perform and provide finest sound quality. Up to date technology supporting high resolution including native DSD, DxD and hyper-modern inputs like Amanero USB and LVDS I2S inputs.

Unique R2R correction technology. Digital signal processing driven by high-speed FPGA supporting FIFO buffering and re-clocking. Software up-gradable design enables future new capabilities and improvements.


Menu Controlled System

All functions operable from front panel for user friendly experience. In total 7 different sound characteristics: 4 different algorithms in NOS mode and 3 types oversampling modes. (Jumper-less version!) 

Easy Firmware update

Micro USB port on back panel. (Update without opening the unit)
3 Different firwmwares available

We offer R2R7HE to R7HE upgrade! Audio-GD - R2R7 (HE) to R7 (HE) Upgrade


 REVIEW OF R7 BY 6MOONS: "In conclusion, we were very impressed with this DAC. For the price, it offers very good sound which is unusually adjustable to individual hardware conditions and taste."

 Blue Moon award


SUMMARY

Design is future proof; software updates to improve and expand current feature set. Two high performance low jitter TCXO oscillators, operating at 98.xxx and 90.xxx MHz level to support todays and future (higher) sample rates. A true balanced analogue implementation

  • True balanced design
  • Digital DSP for optimal signal processing
  • Discrete push-pull R2R DAC design
  • Internal OCC wires & low-jitter TCXO clocks applied
  • Discrete analogue output stages
  • DC coupled design (No capacitors in signal path)
  • Non- feedback ACSS analogue output control
  • Power supply consist of 21 regulated low noise regulators
  • Over 50,000uF power capacity to purify the power supply
  • High-grade matched transistors per channel
  • USB Amanero Combo384 interface with galvanic isolation
  • High Res support: DSD64 - DSD512 & DxD

SOUND CHARACTERISTICS

R7HE is characterized by its coherent, transparent and natural sound. Striking is the spatial sound image. Rich in detail; extremely high resolution; strong authority and wide stereo image. You'll forget that you're listening to a digital source.


USB Singxer F1 Option (Replacing Amanero)

singxef1 repl amanero

Enjoy DSD512 and best sound quality with Singxer F1 USB module installed (Replacing Amanero)

MAGNA HIFI is offering a significant upgrade of the internal USB interface by replacing the Amanero USB interface for a more sophisticated Singxer F-1 XU208 board using the Crystek CCHD-575 ultra low phase noise clocks. Besides the sound quality improvements it enables native DSD512 support! We'll make sure the Singxer F-1 is properly installed and using internal ultra clean power source from the internal DAC to ensure best sound quality


INPUTS

  • 1 - AES/EBU ((3-PIN XLR, 110-ohm)
  • 2 - S/PDIF (BNC, 75 Ohm)
  • 3 - S/PDIF (RCA, 75 Ohm)
  • 4 - S/PDIF Optical (Toslink)
  • 5 - I2S (HDMI, LVDS)
  • 6 - USB (Amanero, USB class 2, 32bit)
  • Micro USB -  Firmware Update

OUTPUTS

  • ACSS balanced
  • XLR balanced
  • RCA single ended

REGENERATIVE POWER SUPPLY

audiogd r7he mhreg psu

An integrated regenerative power supply is a proprietary electric generator built into the unit to avoid any noise from main power and deliver ultra-low noise and clean AC wave to feed the preamp

It will regenerate the main power and block noise from the power line, this way the preamp is able to reproduce the most neutral and analog sound you can imagine.

First a transformer converts main voltage. DC conversion is done by class A PSUs power supplies. 

A discrete balanced regenerative wave generator produces the new ultra-low noise wave form at 400Hz. The 400Hz frequency was chosen because they have better efficiency compared to traditional 50Hz and at this frequency, 400Hz, it will boost the sound to reproduce real and pleasant analog sound.

The balanced gain amps with powerful output stages are driving the regenerative transformers to produce the extreme clean AC power. The extreme regenerated clean AC power is send to separate class A PSUs power supplies for both left and right channel.

The discrete class-A DC power supply with high input impedance will avoid any noise and allow the amplifier stages to have low output impedance at very high speed and linear at frequency spectrum.


R-2R LADDER DESIGN

The R-2R DAC has become popular and affordable. From DIY kits and completely up to of the shelf high-end products.
In the lower end DIY market, the R-2R design is often based on old technology; designed long time ago by MSB, often includes basic R2R ladder design only and not include the wonderful correction design of the modern MSB technology. Previous less good designs used data shift registers logic chips in serial mode to convert the data to an analog signal. The stubborn R2R issues cannot be avoided this way and performance is almost entirely depending on the accuracy of the ladder resistors.audiogd r7he mhr2r da8

In the High-End of the shelf (finished products) market, the R2R design is usually much more complex when outstanding performance is offered. A basic R2R ladder is simply not sufficient to achieve the desired sound quality. Some manufacturers are using shift registers design to realize ladder compensation. A less complex, unfortunately also a less performing design based on traditional logic chips working in serial mode.
A far better design switches resistors in parallel mode; an ultra-fast FPGA chip controls and corrects the R2R ladder. The parallel design mode controls every bit respectively and therefore achieve unprecedented performance. (In parallel mode only 1 clock cycle is needed to output all data; serial design mode needs at minimum 8 up to 24 clock cycles) The parallel design is particularly complex, however when it is done properly it can correct every bit of the ladder. (Photo below shows a FPGA design with R2R ladder). With incredible speed and accuracy the R-28 will correct the unavoidable imperfections of the basic R2R ladder caused by tolerance of resistors; avoid glitches at ultra-high speed to deliver unrivaled musical performance.

TOLERANCE OF RESISTORS IN LADDER

Some manufactures claim to achieve good performance becuase they use lowest tolerance ladder resistors. The following calculation example will cover this. At 16 bit the tolerance of 1/66536, 0.1% (1/1000) it is by far not enough to achieve decent performance. Even using resistors with 0.01% (1/10000) tolerance, lowest tolerance available today,cannot deliver the desired performance This is just 16 bit, imagine a 24 calculation! To process 24 bit resolution it would require resistors with a tolerance of 0.00001%. This is purely theoretical; if this tolerance would exist the discreteness of the switch logic chips will already have too much internal impedance and will shake-up such design.The tolerance of the resistor will never solve Imperfections of a ladder.

The solution lies in the correction the ladder and not only depend on the tolerance of resistors. It’s a combination of both: Ultra-low tolerance resistors controlled by a correction technology using very high speed with parallel FPGA processing.

PROS AND CONS OF DISCRETE R-2R LADDER DAC

Advantages

  1. R-2R will not convert the clock signal into the output signal.
  2. R-2R is less sensitive to jitter
  3. The output signal is more accurate with R-2R

Cons

  1. Modern Delta-Sigma chips offer exceptional THD; R-2R offers satisfactory THD results. 
  2. Accuracy and glitches of the ladder resistors require complex technology to enhance

audiogd r7he r7 fpga

ULTRA FAST SIGNAL PROCESSING

R2R7 FPGA responsibilities:FPGA stands for Programmable Array Logic. Nowadays the FPGA is widely adopted in audio devices. The internal hardware design is fully controlled by complex software. A huge advantage is the fact the software in the FPGA can easily be upgraded offering new capabilities or improve the performance of the device without replacing any hardware. Versatile and future proof design.

  1. High performance SPDIF interface, replacing traditional less good performing SPDIF interface chips like DIR9001, WM8805 or AK411X,etc.
  2. Full re-clocking process with FIFO design applicable on all inputs. This way the output data keeps fully synchronized with the clock signal to reject any jitter.
  3. Built in 2X, 4X and 8X oversampling and digital filters and on top of this 4 different true NOS (only analog 6dB filtering) modes. To completely configure the sound according to your taste.


ANALOGUE OUTPUT STAGES

The analog output stages are as important, they have a tremendous influence on the final sound quality. After d/a conversion by the R2R D/A modules the analogue signal is transported by fully discrete matched-transistor output stages; DC-coupled design with first class through-hole components. No SMD compon ents are applied in the analogue section.

R2R710.jpgThe high speed unique ACSS ((Audio-gd Current Signal System) output stages are non-feedback and current driven. Unique performance because almost all other designs need to convert the signal multiple times from and to current and/or voltage, resulting in less detailed and less transparent sound-stage The output buffers are single ended FET; two stages in parallel to reach very low output impedance. All output stages are in pure class A without (negative) feedback to achieve purest and a real live sound reproduction. The 4 OPA op-amp's are DC servos, this way no coupling-capacitors are needed and DC output is automatically biased. The listener will be presented a strikingly transparent and neutral sound.


R-CORE TRANSFORMERS

The DAC consist of 3 tuned low noise, low flux leakage, R-cores transformers. In total 130W power to supply all digital parts and the left and right analog boards. The DC power is distributed over 19 separate power regulators. All are pure class A low noise shunts; fed by 3 groups linear power supplies. Resulting in ultra-high speed and clean power for all individual parts.


USB SUPPORT

Download USB Amanero drivers for Windows 10
Download USB Amanero drivers for Windows 7 & 8

No drivers required for Linux and/or Mac OS
OSX 10.6+ and Linux with UAC2 compliant kernel
Microsoft Windows: KS/Wasapi/WDM/ASIO

Brand URL : http://www.audio-gd.com/HE/R7HE/R7HEEN.htm
Weight: 15 kg
Width: 430 mm
Length: 530 mm
Height: 93 mm
Brand: Audio-GDAudio-GD

Specifications

R-2R Discrete Ladder(s)
-120dB
2.5V (RCA) 5V (XLR) 2+2mA (ACSS)
0.5 Vp-p
19 dBm
USB / I2S 44.1kHz - 384kHz /32Bit & DSD64-DSD512.| Coaxial: 44.1kHz - 192kHz /24Bit Optical: 44.1kHz - 192kHz /24Bit
1.0, 1.1, 2.0 & 3.0
Windows, iOS, Linux
> 130dB
0.05dB
19
45W Version 1: 100-120V AC 50/60 Hz Version 2: 220-240V AC 50/60 Hz
W430 X L530 X H93 (MM, Fully aluminium)
USB Cable
IEC Power Cord
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MUSIC LOVERS

PROFESSIONAL SERVICE

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PERSONAL ADVICE

AFFORDABLE

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