Earthquake Sound SubZero-15 15-inch Car Subwoofer, 2500 Watts 15-inch car audio subwoofer - handmade in the USA 1250 Watts RMS, 2500 Watts Max Military-grade 3.25-inch aluminum, flat wire voice coil with 3.5-inch winding height Massive 4-inch excursion for high SPL TCT Technology (Turbine Cooled Transducer) for high efficiency output, plus exclusive 8-gauge PSP terminals