Earthquake Sound Magma-15X SWE 15-inch Car Subwoofer 15-inch subwoofer with 1500 watts max power, 700 watts RMS Poly-ether draw surround with thick single layer for longer life and max excursion 3mm stiff non-pressed fiber cone for faster response and lighter mass MAX OD spider for more spider area and more linear spring constant Patented TCT (Turbo Cooled Technology) forced cooled motor in with the cold air and out with the hot air