General Specifications Nominal diameter - 15", 381mm Power rating - 400W Nominal impedance - 8 Sensitivity - 96dB Magnet type - Ferrite Voice coil diameter - 3", 76.2mm Coil material - Copper Cone material - Kevlar loaded paper Former material - Polyimide Surround material - Cloth-sealed Frequency range - 40-3500Hz Xmax - 0.18", 4.75mm Gap depth - 0.31", 8mm Voice coil winding widt - 0.68", 17.5mm Small Signal Parameters D - 0.33m/12.99in Fs - 35.7Hz Mms - 83.32g/2.94oz Qms - 4.75 Qes - 0.474 Mmd - 55.06g/1.94oz Qts - 0.431 Re - 5.76 Vas - 246.7lt/8.7cu. ft. BI - 15.06Tm Cms - 0.24mm/N Rms - 3.93kg/s Le (at 1kHz) - 0.87mH Mounting Information Cut-out diameter - 13.8", 351mm Diameter - 15.2", 385mm Mounting slot dimensions - 0.36x0.24", 9.2x6.2mm Ø Mounting slot PCD - 14.5", 369mm Number of mounting slots - 8 Overall depth - 6.4", 162mm Unit weight - 10.8lb, 4.9kg