Advanced Yamaha Active Servo Technology II

In 1998, Yamaha brought to the marketplace speaker systems utilizing YST (Yamaha Active Servo Technology) to give powerful, high quality bass reproduction. This technique uses a direct connection between the amplifier and speaker, allowing accurate signal transmission and precise speaker control.

As this technology uses speaker units controlled by the negative impedance drive of the amplifier and resonance generated between the speaker cabinet volume and port, it creates more resonant energy (the “air woofer” concept) than the standard bass

reflex method. This allows for bass reproduction from much smaller cabinets than was previously possible.

Yamaha’s newly developed Advanced YST II, with many refinements to Yamaha Active Servo Technology, allows better control of the forces driving the amplifier and speakers. From the amplifier’s point of view, the speaker impedance changes depending on the sound frequency. Yamaha developed a new circuit design combining negative-impedance and constant-current drives, which provides a more stable performance and clear bass reproduction with less murkiness.

High-amplitude bass sound

Signals of low amplitude

Cabinet

 

Air woofer

Signals

(Helmholtz resonator)

 

 

Active Servo Processing

Port

Amplifier

 

 

Advanced

 

impedance

 

Converter

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Yamaha YST-FSW150 Black, YST-FSW050 owner manual Advanced Yamaha Active Servo Technology

YST-FSW150 Black, YST-FSW050, YST-FSW150 specifications

The Yamaha YST-FSW150 and YST-FSW050 are compact subwoofers designed to enhance your audio experience, bringing together advanced technologies and elegant designs to fit seamlessly into any home theater setup. The YST-FSW150, primarily known for its robust sound performance, features a sophisticated active servo circuit control that provides impressive bass response while maintaining clarity and precision in low-frequency sounds. This technology ensures that the subwoofer can adjust its output dynamically, ensuring it can handle a variety of soundtracks from the subtle nuances of a classical piece to the thunderous effects of an action film.

In contrast, the YST-FSW050, while smaller, does not compromise on sound quality. It utilizes similar technology to deliver rich and immersive bass, making it an excellent choice for those limited by space. The compact form factor allows for versatile placement options without detracting from the main audio components in your setup. Both models are designed for easy integration with a range of audio systems, making them suitable for users who are looking to enhance their direct sound experience without investing in a full surround sound system.

Another notable characteristic of both subwoofers is their stylish design. The YST-FSW150 comes in a sleek finish that complements its powerful audio output, while the black variant of the YST-FSW150 adds a touch of elegance to any room decor. This aesthetic consideration makes them not only functional sound components but also stylish additions to any audio environment.

Both subwoofers are equipped with a powerful driver and a high-performance amplifier to deliver deep, powerful bass. The frequency response of the YST-FSW150 ranges from 25 Hz to 180 Hz, providing an expansive bass range that can enrich your viewing or listening experience. The built-in low-pass filter also ensures that only the appropriate frequencies are sent to the subwoofer, delivering high-quality audio without distortion.

In summary, the Yamaha YST-FSW150 and YST-FSW050 subwoofers represent a blend of advanced technology, design, and audio performance. Whether you choose the larger YST-FSW150 for its powerful capabilities or the compact YST-FSW050 for its convenience, you can expect enhanced sound quality that elevates your home entertainment experience to new heights.