Inputs & Outputs
Front-Panel + Remote Control
Floating & Balanced Power Amplifier with MOSFETs: The basic design of
the power amp circuit adopts Yamaha's own, uniquely developed Floating and
Balanced Power Amplifier technology. Adopting output elements with the same
polarity on the plus and minus sides of the output stage, and also completely
separating the NFB (Negative Feedback) circuit and power supply into total of
four plus and minus sides of the left and right channels, results in thoroughly
symmetric push-pull operation of the output stage. Completely floating the
entire power amp circuit from the ground removes any negative impact of minute
voltage fluctuations or ground noise. Moreover, the output elements are
comprised of MOSFETs, which provide a warm and natural sonic character. The use
of MOSFETs, which have the same polarity on the plus and minus sides, further
evolves the ideal of a complete symmetrical design, to eliminate sound quality
variations due to difference in polarity-a major distinguishing characteristic
of the Floating and Balanced Power Amplifier-resulting in sound with a superior
signal-to-noise ratio and superbly well-defined sound field.
All-Stage Full Discrete Construction, Balanced Transmission, and Low
Impedance Design: The A-S2100 has achieved a fully discrete configuration
during tone defeat, by thoroughly separating the tone control circuit from the
signal system. This not only increases response but also improves slew-rate, and
results in high range reproduction of greater vitality, richness and smoothness.
Signal transmission and amplification features fully balanced transmission for
thoroughly balanced operation, even of the control system circuitry. Signal loss
through transmission has been significantly reduced, with the application of
screw clamp connections and thick cables in connecting the pre amp unit with the
power amp unit, which is vital for signal transmission, and in connecting the
power step to the speaker terminals. This improves the damping factor and
improves driver capacity and damping power of the speaker, resulting in vibrant
and powerful bass reproduction.
High-Quality Electronic Volume Control: Yamaha utilizes a high-quality
digital volume control specially designed by New Japan Radio Co., Ltd., which
consists only of ladder-type resistance, removing the impact of slew-rate
decline or coloring of the sound, delivering higher purity in the sound, and
excellent, fast response to large volume changes and steep transients. Moreover,
the tone controls employ a triple-parallel method, minimizing the detrimental
impact on sound quality seen with straight-line tone controls. In addition, the
bass, treble, and common circuits each utilize simple construction in which the
NFB of the amp is not used and the CR elements are simply fixed in a straight
line, ensuring exceptionally pure sound reproduction even when tone control is
applied and superb response to audio signal transients. When tone defeat is
applied, straight signal flow from only one volume circuit to a discrete
configuration buffer amp is realized.
Large Capacity Power Supply: The A-S2100 employs an original EI
transformer, carefully customized for optimum compatibility with the chassis.
Combining four large capacity carbon sheath block capacitors delivers an
energetic sound, even during high volume, that is possible only with the
A-S2100. Moreover, since the control amp and control system is equipped with
twelve shunt type local regulators that prevent deterioration caused by currency
fluctuation, a clean and stable power supply is achieved. The EI transformer is
mounted on the chassis using brass washer, restricting internal vibration that
would result in noise.
Symmetrical Design: The left-right symmetrical construction with the
power supply in the center and the power amp blocks on the ends achieves greater
separation of the left and right channels (necessary for proper two-channel
stereo reproduction) and ideal weight balance. Including fine tuning by a centre
frame which extends from the front to the back of the casing, the A-S2100 has
superb mechanical rigidity and installation stability that dramatically lessens
the impact of external vibrations on sound quality.
Metal & Real Wood Construction: The refined design and construction of
the A-S2100 reflects Yamaha's commitment to fine craftsmanship and art, uniquely
drawing on its long experience as a world-class musical instrument maker. The
metal front panel and the side wood panels have been beautifully integrated by
the masterful use of advanced processing technology. Moreover, the dials and
tone controls are machined aluminum knobs, for a richly textured finish and
Feet Insulators The insulators are crucial parts that block outside
vibrations. They adopt Yamaha's original metal legs in order to maximize
vibration control performance. The user can select point installation by
applying the supplied spikes or plane insulation with the supplied pads, and use
these combined with an interlocking rack if desired.
Inputs & Outputs
Balanced & Unbalanced Analog Inputs: The Yamaha A-S2100 integrated
amplifier is fitted with both balanced & unbalanced analog inputs.
- Balanced XLR: The Yamaha A-S21000 features a set of balanced XLR
inputs for connecting a high-end audio component, such as Yamaha's CD-S2100
CD player (sold separately). You can adjust the Attenuation and Phase of the
- Unbalanced RCA: The Yamaha A-S2100 is equipped with six unbalanced
analog RCA stereo inputs for connecting an external audio source such as a
CD player, AM/FM tuner, Turntable, and/or cassette deck; as well a preamp or
AV receiver. There is also one analog RCA stereo output for recording
through the amplifier.
Main Direct Input: One of the A-S2100's analog inputs is
labeled Main Direct Input. This input allows you to connect your preamplifier or
AV receiver directly to the A-S2100 and use the Yamaha stereo amplifier as a
power amplifier to drive a pair of speakers in your system.
Note: Audio signal coming into the amplifier's Main
Direct Input is only output through the speaker outputs of the A-S2100. No
audio signal will by output from the stereo amplifier's Pre-Out, Rec Out, or
Discrete Phono Amp: The phono amp is comprised of an MC
head amp and an equalizer amp, each of which are discretely configured,
resulting in a rich sound with pronounced musicality, when playing vinyl records
with both MC and MM phone cartridges. The unit's Phono input consists of stereo
RCA jacks and a ground terminal.
Binding-Post Speaker Terminals: Yamaha's meticulous obsession with
quality continues through to the speaker terminals, which are the last and
crucial link in the audio chain. Featuring two sets of binding-post speaker terminals
originally designed handles; these are created by cutting pure brass enabling
secure connection with no reduction in sound quality. Contoured to the shape of
human fingers, they not only look beautiful, but can be turned easily and
fastened tightly with minimal effort. They are also compatible with connections
using banana plugs.
Note: You can use the A & B speaker outputs to power two pair of
separate speakers or you can bi-wire a single pair of speakers. If you use
two sets (A and B) of speaker, the impedance of each speaker must be 8-ohm
or higher. When only using one set of speakers (A or B), use speakers with
an impedance of 4-ohm or higher.
Headphone Amp: The headphone amp is also equipped with fully discrete
configuration, for preeminent drivability and damping properties. Included as
well is a specialized level trimmer that responds to various load impedances.
The unit's headphone amp uses a front-panel 1/4" headphone jack for connecting a
pair of headphones (sold separately). Once a set of headphones are connected,
the amplifier's speaker outputs mute automatically.
Note: The headphone amp does not function for the
amplifier's Main Direct Input.
Pre-Outs: The Yamaha integrated amplifier is equipped with a stereo
preamp output for connecting a powered subwoofer or to use the A-S2100 as a
preamplifier and connect it to a larger power amplifier to power your speakers.
Trigger Input + Remote Input/Output: The A-S2100 features a 12V
trigger input (3.5mm) to synchronize power on /off with another component that
features a 12V trigger output. The integrated amp also has remote input and
remote output minijack terminals for use with external IR receivers and
compatible Yamaha components.
Front-Panel + Remote
Remote Control: The supplied remote control features a design
complementary to the aluminum panel of the amplifier itself, with a simple,
easy-to-understand button layout and metallic texture. In addition to the basic
volume adjustment and input switching controls of the A-S2100, it can also be
used for operation of the companion CD-S2100 CD player (sold separately).
Front-Panel Controls: The integrated amplifier also offers the
following convenient front-panel controls.
- Volume: Controls amplifier's output volume level. The
volume control does not effect the amplifiers Main Direct Input or Record
- Input Select:
- Speakers: The Speaker Selector switch allows you to
select only A speakers, only B speakers, A+B speakers, Bi-Wire, or no
speakers; so you can control which speakers are playing.
- Trim: Adjusts the volume level when headphones are plugged in to
avoid sudden changes in volume. Choose from -6, 0, +6, or + 12 dB.
- Tone Control: Adjustable Bass (+/-10dB), Treble (+/-10dB), and
Balance (L-R). The tone controls do not effect the amplifiers Main Direct
Input or Record Output.
- Meter: Switches the meter display between Off (no meter), Peak
(peak level), or VU (volume unit).
- Phono Switch: Selects the type of turntable (MM or MC) connected
to the integrated amp's phono input.
- Audio Mute: Reduces the current volume level by approximately 20
Front-Panel Level Meters: The center of the main unit features level
meters that provide visual enjoyment of the music as well, with the rapid and
delicate movement of the needles. The meter is illuminated softly from inside by
LED, giving a warm, beautiful lamplight look. The meter indicators can, along
with VU display, be switched to peak display, and can be selected according to
your preferences. The window of the meters has been precision-fit to the
panel for an elegantly beautiful appearance.
Auto Power Standby: The unit enter standby mode automatically if not
operate for approximately 8 hours.