The black A-S1200 Integrated Amplifier from Yamaha offers 90W RMS power per channel and uses floating and balanced power amplifier technology with MOSFETs. The MOSFETs have the same polarity on the plus and minus sides to provide a complete symmetrical design by eliminating sound quality variations due to difference in polarity. This results in sound with an improved signal-to-noise ratio and a well-defined sound field.
The amplifier features a customized EI transformer for optimum compatibility with the chassis. It also features four large capacity carbon sheath block capacitors for a stable sound output during high volume settings. The control amp and control system is equipped with 12 shunt-type local regulators that prevent deterioration caused by current fluctuations. The EI transformer is mounted on the chassis using a brass washer, minimizing internal vibrations that would result in noise.
The included remote control can be used to adjust the volume and input switching controls of the amplifier, and can also operate the CD-S2100 CD Player (sold separately).
Floating and Balanced Power Amplifier with MOSFETs
The basic design of the power amp circuit adopts Yamaha's 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 a 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 MOSFETs have the same polarity on the plus and minus sides to provide a complete symmetrical design by eliminating sound quality variations due to difference in polarity, resulting in sound with an improved signal-to-noise ratio and a well-defined sound field.
All-Stage Fully 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 through the application of screw clamp connections and thick cables between the preamp and power amp units. This is vital for signal transmission between the power amp units and 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.
Electronic Volume Control for Optimum Sound
The amplifier utilizes a digital volume control, designed by New Japan Radio Co., Ltd., consisting only of ladder-type resistance to remove the impact of slew rate decline or coloring of the sound. This delivers purity in the sound and provides a fast response to large volume changes and steep transients. Moreover, the tone controls employ a triple-parallel method to minimize the detrimental impact on sound quality seen with straight-line tone controls. The bass, treble, and common circuits utilize a simple construction in which the NFB of the amp is not used and the CR elements are simply fixed in a straight line. This ensures pure sound reproduction, even when tone control is applied and improved 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 Unit Delivers Energetic, Dynamic Sound with Fast Response
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. Moreover, since the control amp and control system are equipped with 12 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 a brass washer, restricting internal vibration that would result in noise.
The amplifier's left-right symmetrical construction with the power supply at the center and the power amp blocks at the ends helps in achieving enhanced separation of the left and right channels, necessary for proper two-channel stereo reproduction and desired weight balance. Fine tuning by a center frame, which extends from the front to the back of the casing and metal legs (selectable as spike or pad) help in minimizing vibrations that might affect the overall sound quality.
Discretely Configured Phono Amp
The phono amp features a discretely configured MC head amp and an equalizer amp to produce high-fidelity sound with pronounced musicality when playing vinyl records with both MC and MM phono cartridges.
Headphone Amp with Fully Discrete Configuration
The headphone amp is also equipped with fully discrete configuration for preeminent drivability and damping properties. Also included is a trimmer that responds to various load impedances.
The center of the main unit features two level meters with needles. Each meter is illuminated softly from inside by an LED for a lamplight look. The meter indicators along with VU display can be switched to peak display and can be selected according to your preferences. The window of the meters is precision-fit to the panel - completely flat, with no gaps - for an elegant appearance.
Elegant Design with Real Wood Panels and Brass Speaker Terminals
The amplifier's front panel is made of metal while the sides are made of real wood. The dials and tone controls are machined aluminum knobs. The amplifier comes with screw-type brass speaker terminals for secure connection with no reduction in sound quality. These terminals are also compatible with connections using banana plugs.
Insulators Allow Use of Spikes or Pads
The amplifier features metal legs with insulators to minimize outside vibrations. Users can opt for point installation by using the built-in spikes or plane insulation with the supplied pads, or use these combined with an interlocking rack if desired.
Remote Control with Simple Design and Metallic Texture
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, which is sold separately.