ADVANCED YAMAHA ACTIVE SERVO TECHNOLOGY II
In 1988, 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 adds many refinements to Yamaha Active Servo Technology, allowing better control of the forces driving the amplifier and speaker. From the amplifier’s point of view, the speaker impedance changes depending on the sound frequency. Yamaha developed a new circuit design combining
Cabinet | Air woofer |
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| (Helmholtz resonator) |
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Port |
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Advanced impedance |
| |
Converter |
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| Active Servo |
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| Processing | Signals |
| Amplifier |
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Signals of low amplitude
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