Triple Parallel Electronic Volume
and Tone Controls
Conventional audio amps have the volume
and tone control circuits arranged in series
(in line); when the tone controls are used, the
signal route becomes more complicated,
which can lower sound quality. Many high
quality amps therefore have a default circuit
that can be selected to bypass the tone
controls, but this forces you to choose
between tone control and optimum quality.
The A-S2000 and A-S1000 are the first
amplifiers to avoid this problem by employing
triple parallel electronic volume and tone
controls, providing maximum sound quality
even when the tone controls are used (signal
goes through fewer ICs, so there is less
noise). When the tone controls are set to the
center position, the passive element used for
tone control is bypassed, so the three volume
elements connected in parallel operate solely
to drive and control the volume, for more
efficient use of the power output. Each
volume element is an ultra-high quality
device and an analogue potentiometer is
used to provide a very smooth operating feel.
Fully Discrete Phono Equaliser
and MC Head Amp
The A-S1000 uses a fully discrete phono
equaliser circuit, whose quality is comparable
to those in high-end control amps. And with
its high priority on maximising musical
response, it is also equipped with a discrete
head amp for MC cartridges. If you enjoy
listening to records via high performance
cartridges, the A-S1000 is an ideal choice.
Power Supply
Power is provided by four large capacity
power supplies that are completely isolated
from earth. In the preamp stage, the
combination of a low-current circuit that
prevents the occurrence of noise due to
current fluctuation and 12 shunt regulators
supply all stages with clean and stable power.
The extra-large power transformer, the
carbon sheath block capacitors and other
parts that directly affect sound quality were
chosen only after extensive testing.
Symmetrical Construction
Although it is an integrated amplifier, the
A-S1000 has a completely left-right
symmetrical construction that makes it
virtually the equal of separate amps.
A central reinforcing bar ensures that the
chassis is totally rigid.
Specially Designed Feet
The base is equipped with height adjustable,
solid steel feet that maximise stability and
thoroughly dampen any external vibration.
NEW PRODUCT BULLETIN
Completely symmetrical left-right construction. Large heat sink, huge power
transformer, custom-made block
capacitors (18,000µF) and preamp
board.
3/4
Signal passes through two circuits increased noise
In
Volume
Volume
Bass / Treble
Tone control circuit
Bypass
Out
Out
Signal passes through one circuit lower distortion, higher S/N ratio
In
Flat
+
+
Treble
Bass
Conventional Amplifier
A-S1000
Integrated Amplifier
MC Head Amp and Equaliser Amp Block Diagram
Lch In
Phono Out
MM
MC
MM
MC
MC Head Amp EQ Amp
Relay for Selecting
MC Head Amp
EQ Amp
+
B
MC Head Amp
+
B
EQ Amp
-
B
MC Head Amp
-
B
+
+
+
+
+
+
+
+
+
+
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