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Yamaha AST-A10 Natural Sound Active Servo Processing Power Amplifier

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Yamaha AST-A10 Natural Sound Active Servo Processing Power Amplifier

Post by HiFiLab on Fri Jan 19, 2018 12:03 pm

Made In Japan

Yamaha's description:

The Active Servo technology Speaker system is an entirely new concept in hi-fi audio loudspeakers comprising the AST-A10 Active Servo Processing Amplifier.

The Active Servo Processing Amplifier has a high performance power amplifier built in. But it does far more than simply supply an amplified signal to drive the speakers: it actually controls the operation of the speakers directly, providing a dramatic improvement in driving and damping force over conventional systems.

Bass Range and Input Level controls are included to suppress excessively low bass response and adjust the input from a control amplifier (or integrated amplifier), respectively.
The rated output is unmeasurable, but at 6 ohms can be said to be equivalent to 70 watts/channel, and it has a dynamic power rating of about 100 watts/channel

Another awesome feature is that not only can it accept RCA inputs from a pre amp but also can take line level speaker inputs from any integrated or receiver. VERY cool.

The most amazing bass from speakers of this size owing to their proprietary technology. Read on...

The theory of the Active Servo Technology is based upon two major factors, the Helmholtz resonator and negative-impedance drive. Active Servo Processing speakers reproduce the bass frequencies through an "air woofer", which is a small port or opening in the speaker's cabinet. This opening is used instead of, and performs the functions of, a woofer in a conventionally designed speaker system.

Thus, signals of low amplitude within the cabinet can, according to the Helmholtz resonance theory, be output from this opening as waves of great amplitude if the design is such that the size of the opening and the volume of the cabinet are in the correct proportion to satisfy a certain ratio.

In order to accomplish this, moreover, the amplitudes within the cabinet must be both precise and of sufficient power because these amplitudes must overcome the "load" presented by the air that exists within the cabinet.

Thus it is that this problem is resolved through the employment of a design in which the amplifier functions to supply the signals, If the electrical resistance of the voice coil is reduced to zero, the movement of the speaker unit would become linear with respect to signal voltage, and, to accomplish this, a special negative-impedance output-drive amplifier for subtracting output impedance of the amplifier is used.

By employing negative-impedance drive circuits, the amplifier is able to generate precise, low-amplitude low-frequency waves with superior damping, characteristics, and these waves are then radiated from the cabinet opening as high-amplitude signals.

The system can, therefore, by employing the negative-impedance output drive amplifier and a speaker cabinet with the Helmholtz resonator, reproduce an extremely wide range of frequencies with amazing sound quality and less distortion. The features described above, then, are combined to be the fundamental structure of the Active Servo Technology.

The Active Servo Technology Speaker System reproduce a wide frequency range, with linear response extending much lower than with conventional speakers of the same size. For this very reason, the low bass may be a little too overwhelming in some circumstances (when listening in very "live" rooms with hard flat walls) or with program sources with an overemphasized low range.

To compensate for such situations, the AST-A10 is equipped with a bass range controller. Turn the control knob under the front panel door counterclockwise to attenuate excessive low bass which can add unwanted sonic colorations. If the bass sounds fine to you, leave the control knob in the "WIDE" position

Price : RM 1080
Contact Simon Ting 012-3612507

Dealer\Reseller\Trader\Service Provider
Dealer\Reseller\Trader\Service Provider

Number of posts : 2459
Age : 39
Location : klang
Registration date : 2011-03-12

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