The Cerwin-Vega 15" Subwoofer, XLS-15S, is for the serious bass enthusiast who wants room-jarring low frequency down to 35 Hz. Featuring a bass reflex design, it is a 250-watt powered subwoofer with adjustable-level controls and a continuously variable crossover from 50 Hz to 150 Hz. This lets you to tailor the bass response to virtually any environment. This Cerwin-Vega powered subwoofer contains speaker-level and line-level inputs, LFE input, auto-on sensing, user select polarity switch, hi current, class AB amplifier design, bass reflex design and bare speaker wire terminal connections (red and black), all surrounded by an elegant black ash enclosure. This 15" cast frame Cerwin-Vega subwoofer is capable of producing high-quality sound at the level you want.