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Yamaha SW-3 Active Servo Subwoofer — 10″ Woofer | Air Woofer Tec
Yamaha’s Active Servo Technology couples a negative-impedance drive amplifier to a Helmholtz resonator port — the Air Woofer opening — so the amplifier corrects the driver’s motion as it works. 100 watts into a 25 cm cone, rated down to 25 Hz, with a continuously variable 50–150 Hz high-cut at 24 dB per octave. Speaker-level and line inputs both. Very good condition.