Pair Faital Pro 18HP1022 8ohm Neodymium 18" Subwoofer 2000W Replacement Speaker Specifications Brand FAITAL PRO Model 18HP1022 Nominal Diameter 18" Nominal Impedance 8ohm RMS Power 1000 W Peak Power (Watts) 2000 W Sensitivity (dB) 98 dB Max Excursion(Xdam)(Xlim) 17.5 mm Max Linear Excursion (Xmax) 9.5 mm Usable Frequency Range (Hz) 35-1.6k Hz Surround Shape Triple Roll Basket / Frame Material Aluminum Spider Detail/Material 2x non-adjacent symmetrical constant height waves Voice Coil Diameter 4" Voice Coil Former Glass Fiber Voice Coil Wire Material Copper Voice Coil Winding Depth 23 mm Voice Coil Gap Height 12 mm Demodulating Ring No Magnet Material Neodymium Parameters Compliance Equivalent Volume (Vas) 6.32 Ft3 Total Q (Qts) 0.3 Mechanical Q (Qms) 14.4 Electromagnetic Q (Qes) 0.31 Minimum Impedance (Zmin) 6.5ohm DC Resistance (Re) 5.4 ohm Mechanical Resistance (Rms) 8.09 lbs/sec Surface Area of Cone (Sd) 174.22 in2 Voice Coil Inductance (Le) 1.75 Flux Density 1.3 T Moving Mass Of Diaphragm (Mmd) 185.7 g Moving Mass(MMs) 207 g Reference Efficiency (No) 0.0243 Mechanical Compliance (Cms) 0.1 mm/N EBP 113 Hz Driver Displacement 378.4 in3 Mounting and Shipping Information Overall Diameter 18.11" Baffle Hole Diameter 16.61" Bolt Circle Diameter 17.32" Flange and Gasket Thickness 0.55" Depth 7.95" Net Weight(lb) 14.6