FEATURES:[ Nominal Basket Diameter 15 Zoll, 381mm [ Nominal Impedance* 8 ohms [ Power Rating** 300W [ Resonance 35Hz [ Usable Frequency Range*** 45Hz-3.7kHz [ Sensitivity 98.2 [ Magnet Weight 34 oz. [ Gap Height 0.312 Zoll, 7.92mm [ Voice Coil Diameter 2 Zoll, 50.8mm Thiele & Small Parameters[ Resonant Frequency (fs) 35Hz [ DC Resistance (Re) 6.32 [ Coil Inductance (Le) 1.10mH [ Mechanical Q (Qms) 8.10 [ Electromagnetic Q (Qes) 0.63 [ Total Q (Qts) 0.58 [ Compliance Equivalent Volume (Vas) 334.6 liters / 11.8 cu. ft. [ Peak Diaphragm Displacement Volume (Vd) 330cc [ Mechanical Compliance of Suspension (Cms) 0.35mm/N [ BL Product (BL) 11.5 T-M [ Diaphragm Mass inc. Airload (Mms) 60 grams [ Efficiency Bandwidth Product (EBP) 56 [ Maximum Linear Excursion (Xmax) 4.0mm [ Surface Area of Cone (Sd) 823.7 cm2 [ Maximum Mechanical Limit (Xlim) 11.6mm Mounting Information[ Recommended Enclosure Volume [ Sealed 45-62 liters/1.6-2.2 cu.ft. [ Vented 99-175.6 liters/3.5-6.2 cu.ft. [ Overall Diameter 15.15 Zoll, 384.8mm [ Baffle Hole Diameter 13.77 Zoll, 349.6mm [ Front Sealing Gasket fitted as standard [ Rear Sealing Gasket fitted as standard [ Mounting Holes Diameter 0.25 Zoll, 6.4mm [ Mounting Holes B.C.D. 14.56 Zoll, 369.9mm [ Depth 6.05 Zoll, 154mm [ Net Weight 8.8 lbs., 4 kg [ Shipping Weight 10.8 lbs., 4.9 kg Materials of Construction[ Copper voice coil [ Polyimide former [ Ferrite magnet [ Vented and extended core [ Pressed steel basket [ Paper Cone [ Cloth cone edge [ Solid composition paper dust cap Poducer: ";