Nominal Overall Diameter 306 mm 12 in Nominal Voice Coil Diameter 32 mm 1.26 in Magnet Weight 426 g 15 oz Overall Weight 1.8 kg 3.97 lbs Flux Density 0.92 T Voice Coil Winding Depth 9 mm 0.35 in Magnetic Gap Depth 6 mm 0.24 in Thiele-Small Parameters for 16Ω Voice Coil DC Resistance RE 12 Ω Resonance Frequency ƒS 86 Hz Mechanical Q Factor QMS 10.16 Electrical Q Factor QES 2.47 Total Q Factor QTS 1.99 Mechanical Moving Mass MMS 24.3 g Mechanical Compliance CMS 137 µm/N Force Factor BxL 8.16 Wb/m Equivalent Acoustic Volume VAS 46.3 lt. Maximum Linear Displacement XMAX ± 1.5 mm Reference Efficiency nO 1.2 % Diaphragm Area SD 490.8 cm2 Losses Electrical Resistance RES 50 Ω Voice Coil Inductance @ 1kHz LE 0.95 mH Constructive Characteristics for 16Ω Magnet Ferrite Voice Coil Winding Copper Voice Coil Former Epotex Cone Material Paper Surround Material Integrated Paper Dust Dome Material Solid Paper Basket Material Pressed Sheet Steel Surround Treatment No Electrical Characteristics for 16Ω Nominal Impedance 16 Ω Rated Power 35 W Musical Power 70 W Sensitivity@1W,1m 93.