FEATURES:SPECIFICATION [ Nominal Basket Diameter 15"", 381mm [ Nominal Impedance* 8 ohms [ Power Rating: Watts 450; Music Program: 900 Watt[ Resonance: 42Hz [ Usable Frequency Range: 40Hz-1.5kHz [ Sensitivity: 99.8[ Magnet Weight: 11 oz. [ Gap Height 0.365"", 9.27mm [ Voice Coil Diameter 3"", 76.2mm THIELE & SMALL PARAMETERS [ Resonant Frequency (fs): 45Hz [ DC Resistance (Re): 5.31[ Coil Inductance (Le): 0.92mH [ Mechanical Q (Qms): 6.28[ Electromagnetic Q (Qes): 0.41[ Total Q (Qts) 0.39[ Compliance Equivalent Volume (Vas): 158.8 liters / 5.6 cu. ft.[ Peak Diaphragm Displacement Volume (Vd): 846cc [ Mechanical Compliance of Suspension (Cms): 0.14mm/N [ BL Product (BL): 18.6 T-M [ Diaphragm Mass inc. Airload (Mms): 101 grams [ Efficiency Bandwidth Product (EBP): 102 [ Maximum Linear Excursion (Xmax) 9.6mm [ Surface Area of Cone (Sd): 881.1 cm² [ Maximum Mechanical Limit (Xlim): 17mm MOUNTING INFORMATION [ Recommended Enclosure: Sealed:- /Vented: 102-193 liters/3.6-6.8 cu.ft.[ Overall Diameter: 15.32"", 389.1mm[ Baffle Hole Diameter: 14.03"", 356.4mm[ 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: 7.25"", 184.2mm[ Net Weight: 8.6 lbs., 3.9 kg[ Shipping Weight: 10.7 lbs., 4.9 kgMATERIALS OF CONSTRUCTION [ Coil Construction: Copper voice coil [ Coil Former: Polyimide former [ Magnet Composition: Ferrite magnet [ Core Details: Vented core [ Basket Materials: Die-cast aluminium basket[ Cone Composition Paper Cone [ Cone Edge Composition: Cloth cone edge [ Dustcap Composition: Solid composition paper dust cap ";
