SPECIFICATIONS | |
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DAC | 2x ESS ES9038Pro |
FPGA | Altera Cyclone |
Clocks | 3x Accusilicon 318b |
SNR | > 120dB (XLR output) |
THD | < 0.0003% |
Output impedance | 4.7Ω |
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 | |
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Coaxial SPDIF | 1x |
BNC SPDIF | 1x |
Optical Toslink | 1x |
I2S via HDMI LVDS | 1x |
USB (Amanero) | 1x |
CONNECTORS : OUTPUTS | |
---|---|
Balanced ACSS | 1x |
Balanced XLR | 1x |
Single ended RCA | 1x |
GENERAL | |
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Supported OS | Windows, OSX, Linux |
Consommation | 30W |
Dimensions | 240 x 360 x 80mm |
Housing material | Aluminium |
Color | Black |
Accessories | 1x Power cable 1x USB Cable |
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Accusilicon clocks:
Crystek clocks:
Click to download the driver of Amanero combo 384
Audio-gd products had design and test based on the AP SYS-2722 (The top-drawer professional equipment in world)
The different between dual ES9038 Pro and single ES9038 Pro is large:
The different not only the DNR, but the dual ES9038 Pro working under mono mode, the channel crossing is improved for offer a larger and exact sound stage.
Even the ESS9028 Pro, working under mono mode, its DNR had 3DB better than one ES9038 Pro .
The FPGA is important in the D-77:
1, Separate the data feed to dual ES9038 Pro for working in mono mode.
2, Clock re-clock process and FIFO design for all inputs , the output data can exact synchronisation with clock signal, reject jitter.
3, Built in high performance SPDIF interface , bypassing low performance SPDIF interface of the ES9038 Pro .
What is the FPGA duty in the D-77:
1, Separate the data feed to dual ES9038 Pro for working in mono mode.
2, Clock re-clock process and FIFO design for all inputs , the output data can exact synchronisation with clock signal, reject jitter.
3, Built in high performance SPDIF interface , bypassing low performance SPDIF interface of the ES9038 Pro .
Full discrete output stages:
The signal last stage is the analog output stags , they greatly effect the whole DAC sound quality.
The output stages working after ES9038 pro, they are full discrete transistor built with hole parts but not SMD parts .
The high speed ACSS amps work as the signal gain and processing , they are of non feedback design and working in current signal mode . the dual ES9038 pro output [current signal] goes through the ACSS amp .
In our design output stages working in pure class A , and without any negative feedback for the most pure and life like sound reproduction .
There are 4 pcs OPA built in as DC servo , so the DAC can be working well without coupling caps and output the most neutral sound.
Heavy power supplies design:
There are in total 16 groups PSUs .
A total 13 groups of ultra speed linear PSUs (dual stages PSU to remove the power interruptions ). PSUs deliver cleanest power to allow digital circuits working under best conditions .
2 groups of pure class A PSUs to power to the analog circuits and deliver most analog sound .
The control and display circuits are powered by a separate PSU to avoid adding any additional noise to the rest of the circuit.