Owner's Manual
Page 18
... it creates more stable performance and clear bass reproduction without any murkiness. Yamaha's newly developed Advanced YST II adds many refinements to give powerful, high quality bass reproduction. Yamaha developed a new circuit design combining negative-impedance and constant-current drives, ... ( the "air woofer" concept) than was previously possible. ADVANCED YAMAHA ACTIVE SERVO TECHNOLOGY II In 1988, Yamaha brought to the marketplace speaker systems utilizing YST (Yamaha Active Servo Technology) to Yamaha Active Servo Technology, allowing better control of view, the speaker ...
... it creates more stable performance and clear bass reproduction without any murkiness. Yamaha's newly developed Advanced YST II adds many refinements to give powerful, high quality bass reproduction. Yamaha developed a new circuit design combining negative-impedance and constant-current drives, ... ( the "air woofer" concept) than was previously possible. ADVANCED YAMAHA ACTIVE SERVO TECHNOLOGY II In 1988, Yamaha brought to the marketplace speaker systems utilizing YST (Yamaha Active Servo Technology) to Yamaha Active Servo Technology, allowing better control of view, the speaker ...