KAPPA PRO-15A Professional Series Recommended for professional audio in a vented mid-bass or bass enclosure. Also suitable for bass guitar. SPECIFICATION Nominal Basket Diameter 15", 381 mm Nominal Impedance 8 ohms Power Rating Watts 500 W / Music Program 1000 W Resonance 47 Hz Usable Frequency Range 46 Hz - 4 kHz Sensitivity 101 Magnet Weight 80 oz. Gap Height 0.375", 9.53 mm Voice Coil Diameter 3", 76.2 mm THIELE & Small Parameters Resonant Frequency (fs) 47 Hz DC Resistance (Re) 5.23 Coil Inductance (Le) 1.01 mH Mechanical Q (Qms) 8.01 Electromagnetic Q (Qes) 0.40 Total Q (Qts) 0.38 Compliance Equivalent Volume (Vas) 167.7 liters / 5.9 cu. ft. Peak Diaphragm Displacement Volume 274 cc Mechanical Compliance of Suspension (Cms) 0.16 mm/N BL Product (BL) 16.6 T-M Diaphragm Mass inc. Airload (Mms) 72 grams Efficiency Bandwidth Product (EBP) 118 Maximum Linear Excursion (Xmax) 3.2 mm Surface Area of Cone (Sd) 856.3 cm² Maximum Mechanical Limit (Xlim) 13.2 mm MOUNTING Information Recommended Enclosure Volume Sealed N/A Vented 54-184 liters/1.9-6.5 cu.ft. Overall Diameter 15.32", 389.1 mm Baffle Hole Diameter 14.0", 355.6 mm Front Sealing Gasket fitted as standard Rear Sealing Gasket fitted as standard Mounting Holes Diameter 0.28", 7.1 mm Mounting Holes B.C.D. 14.56", 369.9 mm Depth 6.06", 154 mm MATERIALS of Construction Aluminum voice coil Polyimide former Ferrite magnet Vented core Die-cast aluminum basket Paper Cone Cloth cone edge