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Yamaha YST-SW030SL 130W 8"" Powered Subwoofer

This is the integral speaker that produces the theater experience in home-theater sound. The Subwoofer: a Vital Part of Your System. DVDs and digital music sources hold a huge amount of audio data, including a considerable amount in the low frequency range. Multi-channel sound formats dedicate an entire channel to the low frequencies (the ?.1? in 5.1-channel sound), used to deliver the bass in music and explosions, thunder and other low frequency sound effects in movies. Ordinary speakers are not large and robust enough to handle these frequencies, especially for long periods. This is where the subwoofer comes in. By outputting bass sounds with high power and low distortion, it ensures that you are not missing anything, and it also makes the overall sound richer and properly balanced.
Capable of handling 100W of dynamic power, this subwoofer ensures that you hear all bass sounds, even the loudest short bursts, with fast attack and total clarity. The effectiveness of Advanced YST (Yamaha Active Servo Technology) is based upon two principles: 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 cabinet. 28-200Hz low frequency response Black

Advanced YST II (Yamaha Active Servo Technology II)
Front-firing active subwoofer
Linear Port for minimizing extraneous noise
20cm (8?) cone driver with magnetic shielding
High 100 Watts dynamic power

Yamaha began over one hundred years ago when a young entrepreneur named Torakusu Yamaha set out to craft a high-quality reed organ. Before long, the company he founded had not only gone on to manufacture Japan's first piano, it had also gained recognition abroad: In 1904, a Yamaha piano and organ were awarded an Honorary Grand Prize at the St. Louis World's Fair.