Sony Xplod 12-Inch 1200-Watt Subwoofer (XSL121P5) (Discontinued by Manufacturer) Automotive passive subwoofer with 12-inch pentagonal cone for low distortion and clean bass 30 to 2,000 Hz frequency response; designed for use with amplifiers up to 350 watts RMS (1,200 watts peak) Uses anti-corrosive, highly conductive gold-plated binding-post speaker terminals 3 layers of high-strength damper material ensures virtually perfect linear travel of the voice coil and thereby accurate performance Measures 12.125 x 6.375 inches (W x D) sunk/in socket