Used but works perfectly. PSW505 features a sturdy Slot Load Vent that minimizes distortion, and a 300-Watt amplifier that powers a high-quality 12" long-throw woofer to deliver accurate, room-filling deep bass you crave for home theatre. A rotary volume control adjusts the volume of the subwoofer relative to the other speakers in the system and the unit offers a continuously variable low-pass filter, adjustable from 60-120 Hz. Accessible, professional-grade line- and speaker-level inputs, and speaker level outputs allow easy connection to any system for an instant sound upgrade. The subwoofer’s cool styling, with silver details and a real wood veneer adds a classic touch & blends in seamlessly with your room decor. From the Manufacturer Have a big room? Have the need for BIG, life-like bass impact? Then the PSW505 is the subwoofer for you. More than a mere brute, the PSW505 is equally at home reproducing all the subtle nuance of a plucked string bass as it is belting out a rocket's roar. Full-featured and over-powered, the PSW505 will rock your world. Key Features Slot Load Venting improves bass response. The wide, long slotted vent dramatically lessens turbulence, noise and distortion, creating precise, thunderous bass!Polk subs sound better because they're built better. Rock-solid MDF construction (including a 1 inch thick front baffle) suppresses enclosure panel resonance for distortion-free, accurate response.Big 12-inch Long Throw Driver for longer excursion and better linearity.Adjustable low pass crossover, phase switch and volume control allows perfect blending with any main speaker.