Master-2 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-2 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-2 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-2 applies four
channels of diamond non-feedback output stages composed of 48
pieces of ¡§the King of transistors" MJL4281/4302. The capacitance of the whole
machine reaches as high as 220,000uF. Four transformers are used with
total power of 1700W.
Master-2 can input
not only XLR balanced 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 current signal and
Master-2 uses heavyweight all aluminum
alloy chassis to prevent the eddy current of transformers from
interfering with the circuit board. The interior is separated
into 3 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-2 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 .
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 48 pieces
of ¡§the King of transistors¡¨ MJL4281/4302. Master-2 has all parts of four channels exact-matched before