ADVANCED YAMAHA ACTIVE SERVO TECHNOLOGY

The theory of Yamaha Active Servo Technology has been 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 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 this problem that is resolved through the employment of a design in which the amplifier functions to supply special signals. If the electrical resistance of the voice coil could be 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 conventional Yamaha Active Servo Technology.

Our new Active Servo Technology — Advanced Yamaha Active Servo Technology — adopted Advanced Negative Impedance Converter (ANIC) circuits, which allows the conventional negative impedance converter to dynamically vary in order to select an optimum value for speaker impedance variation. With this new ANIC circuits, Advanced Yamaha Active Servo Technology can provide more stable performance and improved maximum sound pressure compared with the conventional Yamaha Active Servo Technology, resulting in more natural and energetic bass reproduction.

High-amplitude bass sound

 

Air woofer

Cabinet

(Helmholtz resonator)

Port

 

Advanced Negative-

 

Impedance Converter

 

Active

Signals

Servo

Processing

 

Amplifier

 

Signals of low amplitude

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Yamaha YST-SW160/90 owner manual Advanced Yamaha Active Servo Technology, High-amplitude bass sound Air woofer Cabinet
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YST-SW160/90 specifications

The Yamaha YST-SW160/90 is a subwoofer model that has garnered attention for its impressive sound performance and innovative technology. This subwoofer is designed to enhance the audio experience, whether it be for music, movies, or gaming, and helps to create a more immersive environment.

One of the standout features of the YST-SW160/90 is its remarkable power output. With a robust 100 watts of RMS power, it can deliver deep, rich bass that fills the room, making it an excellent choice for home theater systems and music playback. This level of power ensures that every thump and rumble can be felt, bringing a new dimension to audio.

The YST-SW160/90 employs Yamaha's exclusive YST (Yamaha Active Servo Technology), which helps to ensure an accurate and responsive bass performance. This technology employs a highly sophisticated speaker driver and an advanced amplifier design. By tracking the movement of the woofer cone, YST actively adjusts the performance to eliminate distortion, improving sound clarity across various frequencies.

Another significant characteristic of the YST-SW160/90 is its elegant design. The subwoofer boasts a stylish finish that can easily fit into most home decors. Its compact form factor makes it easy to place in different locations without overwhelming the surrounding space. Despite its size, the performance is far from diminished, with strong bass response that belies the subwoofer's physical dimensions.

Additionally, the YST-SW160/90 features adjustable controls, allowing users to tailor the bass response to their particular listening environment. The volume control and frequency response adjustments provide flexibility, ensuring compatibility with various types of audio sources. The subwoofer also includes phase control and a low-pass filter, offering users further customization options to achieve the desired sound experience.

The build quality of the Yamaha YST-SW160/90 is another point of appreciation. With a sturdy construction and high-quality materials, the subwoofer is designed to endure regular use, providing long-lasting performance.

In conclusion, the Yamaha YST-SW160/90 is a versatile subwoofer that combines advanced technology, effective power handling, and stylish design, making it an excellent choice for anyone looking to elevate their audio experience to new levels. Whether for casual listening or dedicated home theater setups, this subwoofer delivers deep, impactful bass, enriching any sound experience significantly.
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