Power Rating Watts 225W Music Program 450W Resonance 82Hz Usable Frequency Range 82Hz-3.2kHz Sensitivity*** 95.5 Magnet Weight 7 oz. Gap Height 0.28", 6.99mm Voice Coil Diameter 2.5", 63.5mm THIELE & SMALL PARAMETERS Resonant Frequency (FS) 81Hz DC Resistance (Re) 5.6 Coil Inductance (Le) 0.62mH Mechanical Q (QMS) 4.66 Electromagnetic Q (QES) 0.40 Total Q (QTS) 0.37 Compliance Equivalent Volume (Vas) 10.95 liters /0.39 cu.ft. Peak Diaphragm Displacement Volume (Vd) 100cc Mechanical Compliance of Suspension (CMS) 0.16mm/N BL Product (BL) 13.0 T-M Diaphragm Mass Inc. Air load (Mms) 24 grams Efficiency Bandwidth Product (EBP) 201 Maximum Linear Excursion (XMAX) 4.5mm Surface Area of Cone (SD) 222.4 cm2 Maximum Mechanical Limit (XLIM) 8mm MOUNTING INFORMATION Recommended Enclosure Sealed 7-17 liters/ 0.2-.6 cu.ft. Vented 10-17 liters/0.4-0.6 cu.ft. Overall Diameter 8.02", 203.7mm Baffle Hole Diameter 7.36", 186.9mm Front Sealing Gasket fitted as standard Rear Sealing Gasket fitted as standard Mounting Holes Diameter .28", 7.11mm Mounting Holes B.C. D. 8.60", 218mm Depth 3.90", 99.06mm Net Weight 4.77 lbs., 2.2 kg Shipping Weight 5.47 lbs., 2.4 kg MATERIALS OF CONSTRUCTION Coil Construction Edge Wound Copper voice coil Former Polyimide former Magnet Composition Neo magnet Core Details Vented core Basket Materials Die-cast aluminum basket Cone Composition Paper cone Edge Composition Cloth cone edge Dust cap Composition Solid composition paper dust cap