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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.
Yamaha YST-SW105 Active Servo Subwoofer — Compact 100W
An 8-inch front-firing paper cone on Yamaha's Advanced Active Servo amplifier — 100 watts into 5 ohms, down to 30 Hz, from a cabinet small enough to tuck beside a bookshelf pair. Continuously variable high-cut from 50 to 150 Hz, a Music/Movie voicing switch, RCA and speaker-level inputs plus full-range pass-through outputs. Very good condition.