Balanced DAC Dual ES9038Pro FPGA Amanero 2x 318B Accusilicon 32bit 384kHz DSD
This is the 2021 version of D77. It is equipped with the last Accusilicon femtosecond oscillators to upgrade the DAC precision even further than with TCXO clocks.
A resolutely high-end DAC
Audio-GD offers with its D77 balanced DAC a top-of-the-range HiFi product, intended to provide the most audiophiles with a very high quality reproduction. For that the brand does not skimp on the means by integrating high-end components: Double converter ES9038Pro, FPGA Altera Cyclone, USB Amanero interface and two Accusilicon 318B clocks .
The Audio-GD D-77 in its 2021 version benefits from new features as well as certain improvements, with the aim of providing ever more precise and richer sound reproduction.
- [New feature] The USB input transmits the I2S signal to the FPGA and receives the clock signal for more accurate playback.
- [New feature] The ES9038Pro DACs now use the same clock as the FPGA.
Dual ES9038Pro DAC
The D77 is based on two ESS ES9038Pro chips to deliver high audio performance in stereo or mono. This converter uses the ESS HyperStream II architecture and Time Domain Jitter Eliminator technology, providing a stable signal while drastically reducing jitter. The DAC also supports high resolution files, up to 32bit 384kHz and DSD/DXD via its USB and I2S inputs. Moreover, offering two converters instead of one improves both the dynamic range (DNR) in mono at 140dB and the THD+N at -122dB. Moreover, in mono mode, the unit has one converter per channel, which improves crossover (frequency separation) and therefore provides a wider and more precise sound scene.
Altera Cyclone FPGA
The DAC ES9038Pro torque is directly supported by an Altera Cyclone FPGA. This allows to separate the audio data of each ES9038Pro in they are used in mono mode. It also allows to re-synchronize the signal and place the signals in a FIFO buffer to ensure a jitter at the lowest output. The FPGA also incorporates a more powerful SPDIF interface than that available in the ES9038Pro.
USB Amanero interface and HDMI I2S
As usual, Audio-GD chooses to integrate an Amanero Combo 384 USB interface in its device. This supports high sampling rates and bitrates, up to 32bit 384kHz, as well as DSD. The DAC also has an HDMI I2S input, allowing you to take advantage of these sample rates and bitrates as well. Enough to appreciate his music in the best of ways.
Attention: To use the USB interface from a Windows device, please install the following driver : Download Amanero USB driver.
Double Accusilicon 318B
To ensure a low jitter signal, the Audio-GD D77 couples its DAC ES9038Pro and FPGA to a series of 2x 318B clocks.
Discrete output stage
The last stage of the DAC is its analog output stage. This is extremely important to ensure excellent sound quality. For this it uses a design based on discrete transistors and Vishay resistors. Output buffers are balanced FETs. In addition, the ACSS outputs operate in pure Class A and without feedback, so as to offer the purest and most faithful sound possible.
A consistent PSU
The Audio-GD DAC has a total of 14 power supply units. 11 ultra-fast linear power supply units combined as a two-stage power supply allow the digital circuit to obtain a clean power supply signal.
In the same way, 2 groups of pure Class A power supplies can supply the analog circuit.
Finally, a separate power supply circuit powers the display and control system to avoid electrical disturbances.
|DAC||2x ESS ES9038Pro|
|Clocks||2x Accusilicon 318b|
|SNR||> 120dB (XLR output)|
|Output levels||RCA : 2.5V|
XLR : 5V
ACSS : 2.2MA
|Input sensitivity||Coaxial : 0.5Vp-p 75Ω|
Optical : 19dBm
|Frequency response||20Hz - 20kHz (< -0.1dB)|
|Sampling rate||PCM via USB / I2S : up to 384kHz|
DSD via USB / I2S : up to DSD256
Coaxial : up to 192kHz
Optical : up to 96kHz
|Connectors : Inputs|
|I2S via HDMI LVDS||1x|
|Connectors : Outputs|
|Single ended RCA||1x|
|Supported OS||Windows, OSX, Linux|
|Dimensions||240 x 360 x 80mm|
|Accessories||1x Power cable|
1x USB Cable
Digital filters configurations & Auto Dark Mode
To change the PCM and DSD filters, press the Setting button once. The left display will flash for a few seconds. After that you can choose a PCM filter from 1 to 7 using the left and right arrows. Pressing the "Setting" button again will cause the middle display to flash for a few seconds. After that, use the left and right arrows to select a DSD filter from 4 to 7.
It is also possible to select an automatic sleep mode for the camera screen. To do so, press the "Setting" button again. The left and right display will flash for a few seconds. By pressing the right arrow, the display will show ON or OFF. If OFF is selected, the display will automatically turn off after 10 seconds without pressing a button. If ON is selected, the display remains constantly on.
|DISPLAY (MIDDLE)||DSD FILTERS|
|DISPLAY (LEFT)||PCM FILTERS||FIR2||FIR3|
|1||Fast roll-off, Linear||ON||ON|
|2||Slow roll-off, Linear||ON||OFF|
|3||Fast roll-off, Minimum||OFF||ON|
|4||Slow roll-off, Minimum||OFF||OFF|
|5||Fast roll-off, Apodizing||ON||ON|
|6||Fast roll-off, Hybrid||ON||ON|
|Mapping I2S / LVDS|
|A synthesis of main IIS on LVDS pinouts mapping is available here.|