A1 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 A1 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.
A1 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 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.
Massive use of high power
parts and robust power supply guarantee vigorous current output
that drives most existing loudspeakers.
A1 applies four channels of
diamond non-feedback output stages composed of 8 pcs transistors. The capacitance of the whole
machine reaches as high as 80,000uF. Two transformers are power supply for L and
R channels for less channel sound cross and larger sound stage.
A1 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
Uses all audiophile grade
components, including Vishay and KOA resistors, WIMA caps, custom
order NOVER (UK brand) caps, A1 has all transistors of four channels exact-matched before