Master-10 is a true balanced design
applying the newest ACSS design which can improved the XLR connection to
sound as good as the ACSS connection. It seems complex , but in fact they are
the most simple design the world has ever had , their a lot
components to process the power supply. The Master-10 power amp only has a
single " voltage" gain stage to process signals, but works in ACSS mode
so in fact it is a current gain stage instead of voltage gain stage,
whereas normal OPA chips already include two or three voltage gain
stages. The simplest and shortest signal journey brings out the most
neutral and least colored sound.
Master-10 applies ultra-low distortion
single stage ACSS amplifier and soldered directly on the motherboard . The gain
stages and pre-driver stages working on class A .
The output transistors stages working on high idle current state
. The diamond cross output stage design can avoid "switch
distortion" as good as the class A amp .
The ACSS is
technology made with fully discrete amplifiers. Most people know the
feedback design can offer better specs in test measurements, and
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.
All signal gain is in current, achieved
by the unique, superb open-loop multiple output current mirror.
Incomparably precise and ultra-low distortion in the gain signal is the
result. The signal path is balanced throughout and all transistors work
in class A mode.
ACSS parts use 4 groups of high-quality class A parallel connection PSU
for dedicated DC supply. The class A parallel connection PSU
has very high input impedance to avoid pulse from the PSU from
affecting the gain stages, and low output impedance with very fast
speed and high linear, so it is a very clean power supply.
Massive use of high power parts and robust power supply
guarantee vigorous current output that drives most existing
loudspeakers. Master-10 applies four channels of diamond
non-feedback output stages composed of 24 pieces of ¡§the King of
transistors" MJL4281/4302. The capacitance of the whole machine
reaches as high as 140,000uF. Two transformers are used with
total power of 1500W.
Master-10 can input
not only XLR balanced signal and RCA single end signal, but also the top
grade ACSS current signal. No matter what kind
of signal it is input, it is able to transfer it to balanced current signal and
Shield and avoid vibration:
Master-10 uses heavyweight all aluminum
alloy chassis to prevent the eddy current of transformers from
interfering with the circuit board. The interior is separated
into 2 sections with aluminum boards for the best separation off the ACSS parts, the output stages and transformers. The AC power wire is
shielded by a copper channel from back to front.
Master-10 take care the vibration for the best sound playback.
Each channels gain parts under a 5MM thick aluminum board, these
aluminum board not only poise the heat between cool and hot
amps, our workers care to install all transistors cling the
aluminum board for avoid the vibration cause the sounding worst.
From our testing, with the aluminum board bring clear detail
reproduce and less harsh than take off the aluminum board .
The volume control is also different from conventional technology.
Conventional volume control technology is
the volume control implement in the analog amp
input stage through a volume pot to reduce the signal .
volume pots quality effect the sound quality direct , the low
quality volume pot cause lost the detail and channels imbalance
cause the soundstage distortion . Even the high
performance volume pot still cause the detail lose. Whatever
quality volume pots, must cause the S/N worst .
the Master-10 , we applied the I/V conversion volume control ,
the volume control just a
variable passive I/V conversion place at the ACSS amp output ,
where the output is the current signal, not the voltage signal. The
volume control is I/V conversion, and the volume depends on the
current (I) conversion to the voltage (V). (Like R-2R D/A chips
output passive I/V conversion)
It can keep the signal frequency band flat and
not lost any detail.
It can't degrade on sound
quality in every volume level . After the volume , there are four
dual FET non-feedback buffer output stages offer the
very low output impedance .
Mark Levinson also knows that current volume control has great
benefits, so in their Top End preamp NO.32 volume control, they use
many components to change the signal to current signal (I), then
implement the volume control
, and then change back
to voltage signal (V) again. But Master-10 is simply a more complete
work in terms of the current signal, and technically, it is superior
to conventional technology.
The less conversion bring much neutral sound .
control quality is much important in the real balance gear . It must guarantee the
four channels signal control exact to achieve the performance of the
real balance gear . If the cool and hot of the balance signal
can't guarantee exact, the balance output will has large distortion
cause the sound quality and performance even much worst than a
single end gear waste the balance gear design and the cost.
In Master-10 is
applied a four channels digital control relays based volume control.
.Master-10 has total four channels
through changing the DALE resistors to control the volume for avoid
channels imbalanced ,achieve the best performance and sound quality
of the gear.
Master-10 allow users
select between 99 steps exponential characteristic volume
control and 70 steps linear characteristic volume control,
whatever volume control allow users smooth to control the volume
Uses all audiophile grade
components, including DALE resistors, WIMA & SOLEN caps, custom
order NOVER (UK brand) caps, all audiophile grade input (Neutrik) &
output sockets (CMC) and gold IEC socket. The output transistors are 24 pieces
of ¡§the King of transistors¡¨ MJL4281/4302. Master-10 has all parts of four channels exact-matched before