between ROC and ROC SA:
ROC SA has
our Diamond differential amp circuitry. Diamond differential amp had
been applied for many years in our gears, like our new DAC Reference
8/9, SA-300 power amp, and SA-3000 preamp. Sound signature is musical
and detailed, with a little coloration and a little on the warm side,
and will be forgiving of poor recordings. It can allow the sound to be
a bit richer and better.
sound as "A wire
Usually, in our products, if I use ACSS technology, I
will design the sound signature as neutral.
Neutral in my mind, is neutral and faithful-like, Roc doesn't have any particular character, like our other ACSS
products, its sound depends on the source, Roc reveals to you the
merits or shortcomings of your source. It only drives the headphone,
without coloration. I think, use of the word "neutral and faithful"
will be better than the use of "neutral".
all audiophile grade components, including DALE resistors, EVOX
caps (German brand), custom order NOVER (UK brand) caps, all
audiophile grade input & output sockets.
The input/output of Roc SA:
SA has ample inputs and outputs, and includes two RCA inputs
and one XLR input.
When fed with an RCA signal, Roc
change the RCA signal to an exact XLR signal at the built-in Diamond
When fed with an XLR signal, it can
re-proofread the XLR to make a complete mirror (exact) XLR signal. In
cases where the
source output XLR signal is not exact (Hot signal level is not the same
cool signal level's absolute value), through this re-proofread process,
it can correct the signal to produce an exact XLR signal.
In short, whatever the input might be,
Roc SA will output XLR signal to Headphones, unless your
plugged into the single-ended output socket.
one 4-pin xlr, and one SE 6.5mm stereo socket for headphone output. For
preamp output, it has one RCA and one XLR output.
Diamond differential output circuits:
Benefits 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 experimentation on diamond
differential current these many years, aiming to get a better solution
of circuit design.
For the audio system, high
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 amplifier can only catch half
or even less of the signal level when it disappears. This leads to a
downsizing of the original range of signal output from amp, which
directly causes obscurity or even loss of sound effect and a low
analyzing ability. A lot of amps, therefore, even with a highly
analytical DAC in the system, 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.
In the ROC SA, we
applied the new volume control system, replacing the normal volume pot
with 32-steps volume control through relays and resistors, which can
offer better sound quality than the normal volume pot. We apply two
volume control modules in Left and Right channel separately for lowest
channel crosstalk, also they avoid channel imbalance at any volume
The ROC SA applies high
voltage power supply (DC +30V and -30V after the PSU), so it can offer
large power output, like 15W at 60 ohms and 3500MW at 300 ohms, it can
drive most headphone properly.
performance, it also
applies the high performance Discrete power regulator
supply to get a purer power supply so that a better sound quality is
guaranteed. Roc SA applies
a 80W R coil.
It uses a heavyweight all
aluminum chassis to prevent the eddy current of the transformer
from interfering with the circuit board. Roc SA net-weight of
All the sockets are Hi-End
grade products. Everything that we have done has been for better audio
and sensational effect.
power cable appropriate for your country:
When you place the order
for Roc version SA
, please let us know the type of power cable you require.
Accessories :One power cable.
width 250mm, height 80mm and depth 360mm.
USD680 (Excluding shipping charge)
on how to modify the headphone so that it can be connected to the
Phoenix 4 pins HP amp output.
Click here to read: modification
of the headphone modification
price is USD30,
(includes one female 4 Pins plug and one male
4 Pins plug, some tapes and some WBT tin solder.)
power cable, XLR cables & power filter outletกG
Cable links http://www.audio-gd.com/pro/cablesEN.htm