Yamaha FSW050 Owner's Manual - Page 10

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. Cabinet High-amplitude bass sound Air woofer (Helmholtz resonator) Signals Active Servo Processing Port Amplifier Signals of low amplitude Advanced impedance Converter 6 En