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The PSW-18A self-powered subwoofer punches a wallop of sound, power, and fury with over 1100 Watts!! You find the frequency to shake the floors with the sub set to the desired roll-off point with its fully adjustable low-pass filter. Boasting a 1200W 18" cone driver, and capable of 123dB of sound pressure level, the thump has never bumped so hard!