Power Rating Watts 800W Music Program 1600W Resonance 33Hz Usable Frequency Range 51Hz-1.7kHz Sensitivity 97.3 Magnet Weight 109 ounce Gap Height 0.375", 9.53mm Voice Coil Diameter 4", 101.6mm THIELE and SMALL PARAMETERS Resonant Frequency (FS) 33Hz DC Resistance (Re) 5.28 Coil Inductance (Le) 1.04mH Mechanical Q (QMS) 5.69 Electromagnetic Q (QES) 0.33 Total Q (QTS) 0.32 Compliance Equivalent Volume (Vas) 258.5 liters / 9.1 cu.ft. Peak Diaphragm Displacement Volume (VD) 411cc Mechanical Compliance of Suspension (CMS) 0.25mm/N BL Product (BL) 17.5 T-M Diaphragm Mass Inc. Air load (Mms) 94 grams Efficiency Bandwidth Product (EBP) 99 Maximum Linear Excursion (XMAX) 4.8mm Surface Area of Cone (SD) 856.3 cm2 Maximum Mechanical Limit (XLIM) 12.2mm MOUNTING INFORMATION Recommended Enclosure Sealed Vented 57-108 liters/ 2-3.8 cu.ft. Overall Diameter 15.21", 386.4mm Baffle Hole Diameter 14.0", 355.6mm Front Sealing Gasket fitted as standard Rear Sealing Gasket fitted as standard Mounting Holes Diameter 0.28", 7.1mm Mounting Holes B.C. D. 14.56", 369.9mm Depth 6.35", 161mm Net Weight 22.7 lbs., 10.3 kg Shipping Weight 25.2 lbs., 11.4 kg MATERIALS OF CONSTRUCTION Coil Construction Copper voice coil Former Polyimide former Magnet Composition Ferrite magnet Core Details Vented and extended core Basket Materials Die-cast aluminum basket Cone Composition Paper Cone Edge Composition Cloth cone edge Dust cap Composition Solid composition paper dust cap