Yamaha YST SW012 Owner's Manual
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AdvancedYamahaActiveServo TechnologyIIIn 1998, Yamaha brought to the marketplacespeaker systems utilizing YST (YamahaActive ServoTechnology) to give powerful, high quality bassreproduction. This technique uses a directconnection between the amplifier and speaker,allowing accurate signal transmission and precisespeaker control.As this technology uses speaker units controlled bythe negative hnpe&mce drive of the amplifier andreson_mce generated between the speaker cabinetvolume and port, it creates morn resonant energy(the "air woofer' concept) than the standard bassreflex method. This allows for bass reproductionfrom much smaller cabinets them was previouslypossible.Yamaha's newly developed Advmlced YST II addsmany refinements to Yam_flm Active ServoTechnology, allowing better control of the forcesdriving the amplifier and speaker. From the ampfi-fier's point of view, the speaker impedance changesdepending on the sound frequency. Yamahadeveloped a new circuit design combiningnegative-impedance and constant-current drives,which provides a more stable performance andclear bass reproduction without any murkiness.High-amplitudebass sound_CabinetPort\ISignals of low amplitudeAir woofer(Helmholtz resonator)Advanced impedanceConverterActive Servo IProcessing _,_AmplifierSignals |
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