Advanced Yamaha Active Servo Technology

The theory behind Yamaha Active Servo Technol- ogy is based on two factors: the Helmholtz resona- tor and negative-impedance drive. Active Servo Processing speakers reproduce the bass frequen- cies 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 Helmholtz resonance theory, be output from this opening as waves of great ampli- tude if the size of the opening and the volume of the cabinet are in 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 in the cabinet.

This problem is resolved by a design in which the amplifier supplies 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. To accomplish this, the system utilizes a special nega- tive-impedance output-drive amplifier that sub- tracts the output impedance of the amplifier.

By employing negative-impedance drive circuits, the amplifier is able to generate precise, low-ampli- tude, low frequency waves with superior damping characteristics.

These waves are then radiated from the cabinet opening as high-amplitude signals. The system can, therefore, by employing the negative-imped- ance output drive amplifier and a speaker cabinet featuring a Helmholtz resonator, reproduce an extremely wide range of frequencies with out- standing sound quality and low distortion.

The features described above combine to create the fundamental structure of conventional Yamaha Active Servo Technology.

Our new Active Servo Technology — Advanced Yamaha Active Servo Technology — adopts Advanced Negative Impedance Converter (ANIC) circuits, which allow the conventional negative impedance converter to dynamically vary to select an optimum value for speaker impedance variation. With these new ANIC circuits, Advanced Yamaha Active Servo Technology provides a more stable performance and improved sound pressure com- pared to conventional Yamaha Active Servo Tech- nology, resulting in more natural and dynamic bass reproduction.

High-amplitude bass sound

Cabinet

Air woofer

 

(Helmholtz resonator)

 

 

 

Port

 

 

Advanced Negative

 

impedance Converter

 

 

Active Servo

Signals

 

Processing

 

 

 

Amplifier

 

Signals of low amplitude

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Yamaha YST-SW011 owner manual Advanced Yamaha Active Servo Technology
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YST-SW011 specifications

The Yamaha YST-SW011 is a powerful subwoofer designed to enhance the audio experience for home theater and music enthusiasts alike. Featuring Yamaha’s innovative technology, the YST-SW011 delivers an impressive bass response that fills the room without distortion, making it an ideal choice for both movies and music.

One of the standout features of the YST-SW011 is its advanced Yamaha Active Servo Technology. This technology employs a unique design that optimizes how the subwoofer interacts with the amplifier, resulting in a more controlled and precise output. The subwoofer is equipped with a 10-inch cone woofer that is capable of producing deep, rich bass tones. Complementing this is an efficient 100-watt built-in amplifier that ensures the subwoofer can deliver powerful performances without compromising on sound quality.

The YST-SW011 offers a frequency response range of 28 Hz to 200 Hz, making it capable of reproducing low-end frequencies that add depth to music tracks and movie soundtracks. This broad frequency range ensures that users experience the full spectrum of audio, from rumbling explosions in action films to the subtle nuances in musical compositions.

In terms of versatility, the YST-SW011 features adjustable volume and low-pass crossover frequency controls. This allows users to customize the subwoofer's output to match their particular system and room acoustics. The subwoofer can seamlessly integrate with a variety of speaker systems, making it a suitable choice for both stereo setups and surround sound configurations.

The build quality of the YST-SW011 is also noteworthy. It sports a sleek and modern design, finished in a black wood veneer that allows it to blend seamlessly with most home decor. The compact form factor ensures that it doesn't take up too much space while still delivering impactful sound performance.

Connectivity is straightforward, with both RCA and high-level inputs available, making it easy to connect to a wide range of audio equipment. The presence of a phase switch further aids in optimizing the integration of the subwoofer with other speakers in the setup.

In summary, the Yamaha YST-SW011 is a feature-rich subwoofer that delivers excellent performance and versatility. With its innovative technologies, robust design, and customizable settings, it is an excellent choice for anyone looking to elevate their audio experience. Whether for casual listening or a full home theater setup, the YST-SW011 is capable of providing deep, impactful bass that enhances any audio experience.
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