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Diamond differential
output circuits
Benefit from two high speed diamond differential output
circuits, excellent linearity and low phase distortion, diamond
differential circuit is being loved and supported by more and more
audio fans. Although the circuit is complex, the sound quality is
impressive. We've done a lot of study and experiments on diamond
differential current these many years, aiming to get a better solution
of circuit design.
For a DAC, high analyzing ability
is the most important requirement. The detailed recurrence of
resolution lies in the upward and downward characteristics and the
noise level of the output amplifier. Because output amplifier is the
bottleneck, if the upward characteristic is not good enough, the signal
cannot be followed correctly on time and the amplifier can only catch
half or even less of the signal level before it disappears. This leads
to a downsizing of the original range of signal output from DAC, which
directly causes obscurity or even loss of sound effect and a low
analyzing ability. A lot of DACs, therefore, even with a highly
analytical D/A converter in the digital section, cannot play most of
the details due to its low analog circuit speed. To get a good upward
characteristic, the only way is to use a high-speed low-noise
transistor amplifier. Even operational amplifier and tube cannot
compare with high-speed low-noise transistor amplifier in effectively
lowering the TIM distortion which has a big impact on the sound quality
and promising a pure and pleasant sound delivery.
Output buffer:
The output buffers are Non-feedback. For low impedance,
we applied the dual FET buffer output stage which is quite less
colored than most conventional circuits.
DSP processor:
DAC
SA-2 has built in DSP
processor, which is a Two-channel Digital Interpolation Filter and
data in-phase processor for digital audio. This Device offers
advanced features for high-performance digital signal processing (DSP)
applications up to 250-MHz. Data and Master-clock in-phase
processing are without jitters. So DAC SA-2 can offer a clear
and focused soundstage, apart from accurate and neutral reproduction
of the recorded disc/music.
Power supply:
SA-2 applies the excellent
4 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 SA-2
had
total 20 PSU
groups are applied.
Uses
11 groups of high-quality class A parallel
connection PSU with dedicated DC supply double-stage PSU power
supply for the digital parts in the SA-2 , 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.
For the
musical sound reproduce, the analog parts power supply by 8 groups
discrete dedicated linear double-stage PSU .
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