Specifications

Profoundly accurate sound with the full expressive power of the music.
Exceptional sonic purity, elimination of signal loss—in an exquisite, elegant design.
The supreme culmination of the Yamaha line—the A-S3000.
A-S3000
Integrated Amplifier
Rigid Streamlined Construction—provides strict anti-vibration
protection, and enables shortest cabling routes
The A-S3000 has adopted a newly designed highly rigid double
structure construction in order to achieve profoundly pure and accurate
audio amplification. The bottom chassis and insulator ward off
external vibration, and provide each circuit board a floating structure
supported by an independent inner frame, thoroughly eliminating the
impact of vibration. And the power source unit, which consists of a
power transformer and capacitors, which are major sources of internal
vibration, is fixed firmly with a three-dimensional structured inner
frame, and is supported solidly by the front panel and the rear panel.
The power amp circuit board and the weighty heat sink are attached
to the left and right inner frames. The power supply unit and amplifier
circuits are thus structurally isolated, achieving an ideal chassis
structure which thoroughly blocks the transmission of vibration.
Moreover, the inner frame that supports the power transformer is
shaped with ample space below it, allowing passage of the wiring to
each circuit over the shortest possible route. The newly developed
chassis with this innovative structure helps to minimise the length of
the signal paths and achieve low impedance, as well as providing high
rigidity and anti-vibration benefits. The result is a dramatic reduction
in signal loss, for remarkably pure audio amplification.
Large toroidal transformer, solidly mounted
with independent three-dimensional inner frame
An independent three-dimensional inner frame has been employed in order
to provide a more solid mount for the large toroidal transformer, which is
installed in the centre of the A-S3000, considering the ideal weight balance.
The completely copper-plated inner frame has a structure which integrates
the front-back and left-right frames with a convex-shaped highly rigid
main frame as its base, reducing vibration coming from all directions. For
the base, to which the power transformer is installed on the inner frame,
brass was selected by strictest examining the particular sonic properties of
various materials by exhaustive listening tests. This material effectively
reduces vibration caused by the power transformer, helping to create sound
of greater clarity and spaciousness.
double construction design creates space for cables under the bottom of
the chassis, enabling the shortest cable path for the supply of power from
the transformer to the power stage and for the audio signal transmission
path. This helps to eliminate signal transmission loss and to smoothly
supply power, even during high-volume transients, and allows more direct
audio reproduction without
even the slightest adverse
effect on the music. Also,
the three-dimensional inner
frame to which the power
transformer is mounted is
copper plated. Extremely
low impedance is assured
by lowering the ground
potential. This sharply
lowers the impact of noise,
and delivers a profound and
richly emotional sound—one
that perfectly communicates
all the original expression of
the artist.
Comprehensive low impedance design,
shortened signal paths and copper-plated chassis
In order to achieve the absolute purest signal transmission, capable of
communicating even the most subtle nuances of the music and its powerful
dynamism—for example, reproducing powerful, agile low frequencies,
and portraying all the emotional nuances of the human voice—we’ve
methodically pursued low impedance throughout the A-S3000. Using a
Bottom view
Audio signal route
Power supply route
Six mm thick top panel made of
non-magnetic aluminium plate
The top panel and the front panel are made
of aluminium, a non-magnetic material, in
order to eliminate any adverse effect on
the audio signals. In the course of strictest
examination of the sound quality, the front
panel thickness was set at 7mm and the top
panel was set at 6mm. This helps to realise
an exceptionally natural, spacious sound by
providing a highly rigid chassis structure,
and at the same time, skillfully controlling
the impact of vibration. Moreover, heat
dissipation openings on the top panel were
formed by high precision cutting from both
sides—front and back—of the panel, and
finished with thorough scrupulous attention
to every detail. Stylish slits in the centre,
matching the companion CD-S3000 and its
design, strongly emphasise the powerful
power source unit inside by having the
same width as the power transformer.