TAS-B15 A(mm/inch): 325 /12.8 B (mm/inch): 303 /11.93 C(mm/inch): 285 /11.22 D (mm/inch): 198 /7.8 E (mm/inch): 83 /3.27 F (mm/inch): 193 /7.6 SPECIFICATIONS Sensitivity: 90.1 dB Nominal: Dual 2Ω DcResistance(DC): Dual 1.9Ω Voice Coil Dim: 3" PowerHandling: 1500 Watts PeakDynamic: 4500 Watts XMAK one way: 0.7" XMECH one way: 1.5" VAS: 68.6 L FS: 27.4 Hz QES: 0.65 QMS: 6.52 QTs: 0.59 Motor assembly: 195 Oz Displacement: 0.36 cu.ft Item dimensions: 0.0 inches Item depth width height: 0.0 inches Speaker type: Subwoofer Item weight: 39.0 pounds FEATURES Cast aluminum high excursion basket with optimized air flow design. Double stacked high density ferrite magnets. FEA enhanced motor structure. CF tech (Cooling Flow) flared vent backplate for increased heat dissipation. Rigid composite paper cones with increased stability. Soft compliance triple layer stretch foam surround 10" Quad layer progressive roll spider pack (8.6" on B10) 3” High temperature dual voice coil.