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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.
ESS9028 Pro, working under mono mode, its DNR had 3DB better than
one ES9038 Pro .
The FPGA is important in the D-77:
The FPGA is Programmable Array Logic.
Nowdays the FPGA
had applied in a lot high end grade DACs, like the popular ROCKNA
Its inside hardware
construction can through the complex software to design and arrange,
and it can upgrade through the software upgrade.
While upgrade the
firmware, just same as upgrade the hardware. The design is much
flexibility , can improve on sound quality , addition the newest
functions , and it can never become out of date.
What the FPGA duty in the D-77:
1, Separate the data feed to dual ES9038
Pro, let them working in mono mode.
2, Clock re-clock
process and FIFO design for
all inputs , the output data can exact synchronization with clock
signal, reject jitter, improved sound for all inputs.
3, Built in high
performance SPDIF interface , give up the built in low performance
SPDIF interface of the ES9038 Pro, much improved on the sound
quality with SPDIF inputs .
Full discrete output stages:
The signal last stage is the analog output
stages, they can much effect the whole DAC sound quality.
The output stages
working after ES9038 pro, they are full discrete transistors and
0.1% vishay resistors built in.
The high speed ACSS
amps as the signal gain and process, they are non feedback design
and working with current signal , so the dual ES9038 pro output
current signal can through the ACSS amp , don't like others design
want to multiple conversion the signal between current and voltage.
The output buffers
are the single ended FET design .
In total the ACSS output
stages are working in pure class A state, and without any negative
feedback for the most pure and real like sound reproduce.
There are 4 pcs OPA
built in as DC serve , so the DAC can working well without couple
caps and output the most neutral sound.
Heavy power supplies design:
There are in total
14 groups PSUs .
A total 11 groups
ultra speed linear PSUs group become dual stages PSU for remove the
power interrupt , give the digital circuits working under the very
clean power supply .
2 groups pure class
A PSUs for power supply to the analog circuits made the sound more
The control and
display circuits power supply by a separate PSU for avoid the
interrupt between them and signal circuits.