|
Xmos U8 Introduce and drivers
download
Amanero
combo 384 Intruduce and driver download
(For the unit with the Amanero Combo384 upgrade module)
Audio-gd products had
design and test based on the AP SYS-2722 (The top-drawer
professional equipment in world)
        
Reviews:
http://www.head-fi.org/t/806397/audio-gd-new-nos-7-2016-edition-impression-thread/60
How to update the firmware
Since
Oct. 12th. 2016 , the unit had update the Ver 2 DSP software:
The
Ver 2 DSP software had improve on the timing performance, hence can
support high res music better and working better on high
oversampling input, users can hear more better detail in sound
quality . And the new software had addition the 3rd Nos mode for
users choice for their favorite taste.
What's new in the
NOS
19:
The NOS
19 produced is based on a lot our older PCM1704 product users
feedback .
A lot users feedback they
like the NOS sound in the PCM1704 products, let me made the
decision to design a new software offer the better performance of
the NOS mode.
For the most real like
sound reproduce, Mr.Kingwa had spend a long term to design and
rectify the new NOS DSP software personally, not only based the the
software codes , but he also well know on the hardware
compatible and sensitivity on the sound quality
.
In the design had
applied -6db /oct passive analog filter ,
you can hear the wonderful sound of the NOS but you can't hear the
noise as other some NOS design .
100 people may had 99
type prefers . We had design two NOS modes in the software for users
select.
One is the best speed
data process, another is applied large algorithm to process the
data.
The full
new design concept had boost the PCM1704 support up to 768KHz even
1536KHz (test in emulation mode).
A high exact TCXO for the DSP chip
running in the asynchronous data process mode, it don't want the
source master clock input , which is reduce the signal transmit
request, FIFO design and rebuilt the clock by the DSP chip, can
refuse the jitter .
IN1 , USB input
,up to 32bit / 384KHz support .
IN2 , HDMI input
,up to 32bit / 384KHz support .
IN3, RCA coaxial
input, up to 24bit /96KHz support .
IN4, optical input
, up to 24bit / 96KHz support .
Different to the DAC 19:
The DAC 19 had the 8X times
oversampling and NOS mode can be selection .
The NOS 19 had the more
advantage algorithm than the NOS mode of the DAC 19 .
The oversampling design and NOS
design had different sound characteristic ,it is not which is better
but depend on the customer's prefer.
We can't exact explain the
different in English, please search in web .
Summarize
Multi-ply shield boards to isolation the power input socket , transformer, power supplies,
digital part and the analog part .
Fully Discrete design built by discrete analog stages without any OPA
and coupling caps in the signal channels .
Non- feedback ACSS analog output stage
Large
R-core transformers and Hi-fi grade parts like DALE resistors, WIMA
caps and OCC wires .
A total of 5 groups class A parallel mode PSU power supply for all
digital and analog circuits.
4 digital inputs: USB / Optical / Coaxial /HDMI
Support up to 384K / 32 BIT through USB
Best sound SPDIF interface chip DIR9001 built in .
DAC output: RCA / ACSS
Below is the picture of the DSP input , was from the Amanero connect
the macBook pro .
And after the DSP process :
 |
Technology detail
Detail of the Current Conveyor Technology
Simple and short signal transfer is best:
The
NOS 19 is a fully discrete design. Applies the 2
Pieces Expensive high-end grade PCM1704UK which can support up to 32 Bit / 192KHz through
USB / I2S input . The SPDIF input support up to 96K / 24 BIT
because we had applied the best sound SPDIF receiver DIR9001 .
Different to other PCM1704UK designs , we applied Non-feedback ACSS
analog stages. The PCM1704UK feed to the ACSS analog
stages without any OPAs and couple caps so it can avoid sound coloration .
The ACSS is a non-feedback
technology made with fully discrete amplifiers. Most people know the
global
feedback design can offer better specs in test measurements, and
classic non-feedback can't do well in test measurements but can offer better
sound for the human's ears. Here is a conflict of the classic circuits.
But the ACSS opens a new field, it can offer a least coloration sound
which is more neutral with very low distortion and high linearity. So
it can retain the dynamics, detail and neutral sound but not sound
bright or harsh.
The ACSS circuit naturally working in
current model and have design current input , it can
transfer the PCM1704UK current signal to output and implement the
I/V conversion in current model in one ACSS amp . And this ACSS
amp only have one current gain stage , the PCM1704UK output signal
only through one stage can arrive the output stages .
The shortest signal journey can reproduce the
best detail and dynamic, and almost without sound coloration ,
It can show the real performance of the PCM1704UK .
The output buffers are
Non-feedback class A FET design.The output impedance only had 10 ohm .
DSP-1 processor:
For
the most real like sound reproduce, Mr.Kingwa had spend a lot time
to design and rectify the new NOS DSP software personally, not
only based the the software codes , but also had a lot audition on
the sound quality .
In the design had
applied -6db /oct passive analog filter ,
you can hear the wonderful sound of the NOS but you can't hear the
noise as other some NOS design .
100 people may had 99
type prefers . We had design two NOS modes in the software for users
select. Since Oct. 12th. 2016, the new Ver 2 software had offer 3
Nos modes .
One is the best speed
data process, another is applied large algorithm to process the
data.
The full
new design concept had boost the PCM1704 support up to 768KHz even
1536KHz (test in emulation mode).
A high exact TCXO for the DSP chip
running in the asynchronous data process mode, it don't want the
source master clock input , which is reduce the signal transmit
request, FIFO design and rebuilt the clock by the DSP chip, can
refuse the jitter .
Power supply:
NOS 19 applies the excellent 2 pcs PCM1704UK
and excellent analog
output stages, but these are not the only keys of the best sound.
The power supply is most important. Even applying the best DA chip
and the best amp, if matched to a normal power supply, the total
sound may still be average or sound musical, but can't be neutral
and detailed. That is why it is easy to find hi-end grade gears
maybe without the best chips or amp stages, but with plenteous
dedicated DC supply circuits.
The NOS 19
had
total Uses
5 groups of high-quality class A parallel
connection PSU with dedicated DC supply double-stage PSU, which can
offer very clear DC power for the DAC, producing
a very black background and neutral sound characteristic. The
double-stage PSU is very important for digital parts. Some designs
may have very low jitter in theory, but if the power is supplied by
a dirty or low-speed power supply, it will increase the jitter and
pollute the data, and degrade the sound quality obviously.
The class A parallel connection PSU has very high input
impedance to avoid pulse through the PSU from affecting the DAC and
low output impedance with very fast speed and high linearity, so it
is a very clean power supply. In my experience, its sound is better
than battery power supply, better human sound and neutral.
Diagram of the Class A PSUs for analogy parts Diagram of the
Class A PSUs for digital parts
Built in Hi-End grade parts :
NOS 19 have built in most high end grade parts, like the DALE resistors
(USA), WIMA caps (Germany) and NOVER parts (UK) .
These parts have through long
term practices and consider have least sound coloration .
Built in high end grade parts
have not warranty have the good sound , but the best
technology design with high end grade parts can have the high ended
sound quality . |
Summarize
