The XLS-15S Front-Firing 15" Powered Subwoofer from Cerwin-Vega features a bass reflex design with high-impact low frequency response down to 25 Hz. The speaker includes a built-in 250-watt RMS class AB power amplifier and a 15" cast frame high excursion powered subwoofer with a frequency response of 40 to 300 Hz at -3 db. Additionally, the unit offers level controls and a continuously variable crossover from 50 Hz to 150 Hz, enabling the user to tailor the bass response to almost any environment.