hfe_yamaha_a-s1000_brochure_en.pdf

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NEW PRODUCT BULLETIN
Integrated Amplifier
• High performance amplifier that takes full advantage of the sound quality
benefits of balanced amplification
• Floating Balanced Power Amplifier
• Triple parallel electronic volume and tone controls
HiFi Began with Yamaha
Yamaha’s involvement with and passion for music goes back more than a century, to when we built our first reed organ in
1887. Now we are the world’s leading producer of pianos and other musical instruments, and are involved with music in
many other ways as well. We manufacture professional recording equipment, we design concert halls and we assist artists at
concerts with set up and sound tuning. This knowledge and experience benefits our production of audio components in
many ways. We introduced our first HiFi (High Fidelity) turntable in 1954, becoming the first company to actually use the
term “HiFi.” Thereafter we were one of the first to offer mass-produced, high quality audio equipment, and introduced
many legendary stereo components. We hope you enjoy the genuine HiFi experience of Yamaha Natural Sound.
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NEW PRODUCT BULLETIN
Integrated Amplifier
The brilliantly expressive capabilities of Yamaha’s floating and balanced design
— now available to a wider range of music lovers.
Yamaha’s All-New Approach to
Achieving Superior Performance
The development of the modern audio amplifier
began in the 1960s with the introduction of
full-transistor amplifiers. In the 1970s, pure
complementary configured power amps
appeared, made possible by high output PNP-
NPN transistors, and became the dominant type
of analogue amplifier. Now digital amps have
become popular for their high conversion
efficiency and superior operating precision, as
well as for their lower weight, size and heat
production as compared to analogue amps.
Some manufacturers of audiophile-quality amps
are working to improve the traditional pure
complementary analogue amplifier, while others
are seeking to achieve higher sound quality
from digital amplifiers.
But Yamaha has developed a third approach
that we believe is superior to the other two. The
Floating Balanced Power Amplifier uses
patented technologies featuring power
transistors with the same polarity at the output
stage to achieve completely symmetrical
operation.
First introduced in the A-S2000, this
method is also used to good effect in the
A-S1000, which combines a floating balanced
power amp section with a high quality preamp
section. Simpler in configuration yet with many
of the same sound quality features as the ultra
high-end A-S2000, it will deliver excellent
performance with the CD-S1000 Super Audio
CD Player and other high quality components.
High Performance Amplifier that
Brings Out the Best of Other
Components
The power amp, power supply, and phono EQ
circuits that contribute to the A-S1000’s high
sound quality are identical to those of the
A-S2000, while the line amp section and
volume and tone circuits are nearly the same.
Designed to take full advantage of the excellent
sonic qualities of the matching CD-S1000, the
A-S1000 will also bring out the best of other
high performance components.
output stage. The use of four sets of floating
power supply units (not connected to earth),
provides further operating precision. The result
is very low levels of noise and distortion for
exceptionally pure and transparent sound
quality.
Conventional Power Amplifier
Power amp and signal input and output are connected to ground
+
B
Noise
Speaker
Power Supply
Feed back
Ground
wiring
Power Supply
Ground wiring
Noise enters power amp through ground
–
B
Floating Balanced Power Amplifier
A-S1000 Floating Balanced Power Amp
With the A-S2000 and now the A-S1000,
Yamaha has taken the bold step of using a
floating balanced configuration to update the
power amplifier for serious music fans. This
method, which is completely different from the
pure complementary circuit that has been the
main type used for the past four decades,
features identical polarity on the plus and minus
side of the output stage. By completely isolating
the plus and minus sides of the left and right
channels of both the NFB and power supplies, it
achieves perfectly symmetrical operation in the
Symmetrical
Speaker
Floating power supply
Floating power supply
Feedback
Feedback
+
S Signal
+
–
S Signal
–
Ground wiring
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NEW PRODUCT BULLETIN
Integrated Amplifier
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.
Completely symmetrical left-right construction.
Large heat sink, huge power
transformer, custom-made block
capacitors (18,000µF) and preamp
board.
MC Head Amp and Equaliser Amp Block Diagram
MC Head Amp
Relay for Selecting
MC Head Amp
EQ Amp
+
+
+
MC Head Amp +B
EQ Amp +B
MM
Lch In
+
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
MC
+
MM
+
MC
+
+
+
Phono Out
+
EQ Amp -B
MC Head Amp -B
Conventional Amplifier
Volume
In
Tone control circuit
Bass / Treble
Bypass
Out
Signal passes through two circuits
increased noise
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.
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.
A-S1000
Bass
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
Treble
Volume
In
+
+
Flat
Out
Specially Designed Feet
The base is equipped with height adjustable,
solid steel feet that maximise stability and
thoroughly dampen any external vibration.
Signal passes through one circuit
lower distortion, higher S/N ratio
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NEW PRODUCT BULLETIN
Integrated Amplifier
Black finish available.
A-S1000 Main Specifications
[AUDIO SECTION]
Maximum Power
Minimum RMS Output Power
Maximum Power
Dynamic Power/Channel
Damping Factor
(4 ohms, 1 kHz, 0.7 % THD, for Europe)
(8 ohms, 20 Hz—20 kHz, 0.02% THD)
(4 ohms, 20 Hz—20 kHz, 0.02% THD)
(8 ohms, 1 kHz, 10% THD)
(4 ohms, 1 kHz, 10% THD)
(8/6/4/2 ohms)
(8 ohms, 20 Hz–20 kHz)
CD, etc.
Phono MM
Phono MC
Main In
CD,etc. to Speaker Out, Flat Position
CD,etc. to Speaker Out, Flat Position
Phono MM
Phono MC
CD, etc. to Speaker Out
Phono MM to Rec Out
Phono MC to Rec Out
160 W + 160 W
90 W + 90 W
140 W + 140 W
115 W + 115 W
190 W + 190 W
105/135/190/220 W
160
150 mV/47 k-ohms
2.5 mV/47 k-ohms
100 µV/50 ohms
1 V/47 k-ohms
5 Hz–100 kHz, +0 dB/-3 dB
20 Hz–20 kHz, +0 dB/-0.3 dB
20 Hz–20 kHz, ±0.5 dB
20 Hz–20 kHz, ±0.5 dB
0.015% (90 W/8 ohms)
0.005% (2 V)
0.05% (2 V)
Signal-to-Noise Ratio
[IHF-A Network]
Residual Noise
Channel Separation
(1 kHz/10 kHz)
CD, etc. (150 mV, Input Shorted)
Phono MM (5mV, Input Shorted)
Phono MC (500 µV, Input Shorted)
CD, etc. [IHF-A-Network]
CD, etc., Input 5.1 k-ohms Terminaled
Phono MM, Input Shorted, Vol: -30dB
Phono MC, Input Shorted, Vol: -30dB
Bass Boost/Cut (at 50 Hz)
Bass Turnover Frequency
Treble Boost/Cut (at 20 Hz)
Treble Turnover Frequency
[GENERAL SECTION]
Dimensions
Weight
(W x H x D)
435 x 137 x 465 mm
17-1/8” x 5-3/8” x 18-5/16”
22 kg
48.5 lbs.
98 dB
93 dB
85 dB
73 µV
74 dB/54 dB
90 dB/77 dB
66 dB/65 dB
±9 dB
350 Hz
±9 dB
3.5 kHz
Tone Control Characteristics
Input Sensitivity/Impedance
Frequency Response
RIAA Equalisation Deviation
Total Harmonic Distortion
(20 Hz–20 kHz)
The perfect match:
Super Audio CD Player
For details please contact:
Visit us at our website:
http://www.global.yamaha.com
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P10019746W-AS1000@NPB

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