Singularity 7, is a real fully balanced discrete design.
Applies the 8 Pieces Expensive high-end grade PCM1704UK, which is
the top grade R-2R chips, every channel had built in 4 pcs , every 2
pcs in parallel, and then they are working in balance mode . In my
particular design, all 8 pcs PCM1704 are working for outputs, even
just connect the RCA outputs .
The SPDIF inputs can support up to 24Bit / 192KHz ,and the USB, IIS
inputs support up to 32Bit / 384KHz .Cause by the PCM1704 support up
to 1536KHz sampling, so the 192KHz or lower sampling can working
between NOS to 8x times oversampling, over 192KHz will working with
4x times oversampling auto, or by the users setting between NOS to
4x times oversampling .
Different to other PCM1704UK designs , it applied Non-feedback ACSS
analog stages. The 8 pcs 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
About the ACSS technology detail, Mr. Ho had post some
few articles in the monthly <Radio & television > since 2007 year.
Output buffers :
The output buffers are newest improve version Non-feedback
pure class A FET Cascode desgn . Its distortion is much lower
than the last version . For low impedance, it applied the dual FET
buffer output stage which is quite less colored than most
conventional circuits, the output impedance is less than 10 ohm.
Most DAC products
design , will applied the normal Logic chips to process the digital
signal, but the normal Logic chips most had the 40HMz speed. In long
term ago, the music files only had 44.1K and 48K,40MHz is enough for
process the signal. But nowdays, 384K music files had popular, 40MHz
limit even can play the sound but the input signal speed had close
the chips highest working frequency, the signal had serious delay
and distortion, cause the sound lost a lot detail .
Now, Singularity 7
release, the design had give up the normal and low performance
chips, which is only can working with tens MHz frequency clock , it
applied two pcs Xilinx CPLD, and an Altera FPGA to perform all the
data process . All three chips can process a lot different data
simultaneity up to 450MHz speed, and simultaneity data process can much exact to process and this
is most important in digital audio area .
Singularity 7, built in
two high performance TCXOs for process different sampling signal,
working as in the no jitter state, revert all detail and soul of the
Singularity 7, no longer
had the performance and sound quality limit by the normal and fixed
function chips like the DIR9001, WM8805 and the DF1706, all function
blocks are through the design with the ultra speed
characteristic in the FPGA, can got the best timing performance , minimal
jitter , boost the sound quality most neutral , the detail, dynamic
can fully show in your system.
Singularity 7, through
design and perform below hardware circuits:
SPDIF (coaxial and optical ) decoder .
AES/ EBU decoder.
Source signal select with minimal timing delay .
Clock signal regeneration .
Digital signal process and refuse jitter process.
Digital filter process.
Singularity 7¡AI had
design the most neutral sound quality, but for best
suite the users personal flavors which is like the coloration sound
flavor , it had built in different setting
for users can through change the setting and oversampling (8x, 4x,
2x and NOS) to get different sound flavors .
Singularity 7 applies the excellent 8 pcs
PCM1704UK and excellent analog output stages, but these are not the
only keys of the best sound.
supply is most important. Anythings in the signal are source from
the power supply .
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.
Singularity 7 had total 3 units R core transformer for power supply
the digital and analog separate. And more than 50,000 UF caps for
smooth the power supply .There are total 22 PSU groups are
applied. Uses 19 groups of high-quality class A parallel connection
PSU with dedicated DC supply double-stage PSU.
The class A parallel connection PSU had ultra high input impedance,
which is can refuse the power interrupt through the PSU , it
also had very low output impedance ,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
Why to said
how excellent of the class A parallel connect PSU but less design in
the audio products? This just same as the pure class A amp, it had
high request on the parts quality and building workmanship , in
nowdays the money world , even the expensive brands had not like to
Singularity 7, it is not put the parts full in
the chassis, but the audio grade parts can offer better performance
and working steady . Applied the normal parts not worst if the
design is excellent, still can had rich musical , but no way to had
the most neutral sound .
Singularity 7 had most applied
DALE, WIMA and Nover ect. audio grade parts, and the Canare , Natrik
sockets, and the OCC wires, custom order TCXOs which is building
without compromise .
Singularity 7, assemble in a heavy monsters chassis which is built
by pure aluminium . It had the thick aluminium board to separate the
power transformer, digital parts , the left and right analog parts.
Even the IEC power inlet, had shield in a pure cooper shield box .
, every unit finished the parts assemble , must had the full test by
the technician , then build by another technician . There are 300
hours burn in time after building, during the burn in time, every
unit must had two times test in every day . Finally , the QC
technician had the final test and audition before package and
shipping. The complex process in the building , just for keep
every units had the highest quality .