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Eminence SIGMA PRO 18 A SPECIFICATION Nominal Basket Diameter 18", 457.2mm Nominal Impedance* 8 ohms Power Rating Watts 650W Music Program 1300W Resonance 28Hz Usable Frequency Range 41Hz-2.4kHz Sensitivity*** 99 Magnet Weight 120 oz. Gap Height 0.375", 9.53mm Voice Coil Diameter 3", 76.2mm THIELE & SMALL PARAMETERS Resonant Frequency (fs) 28Hz DC Resistance (Re) 6.29 Coil Inductance (Le) 1.90mH Mechanical Q (Qms) 8.28 Electromagnetic Q (Qes) 0.30 Total Q (Qts) 0.29 Compliance Equivalent Volume (Vas) 441.2 liters / 15.6 cu.ft. Peak Diaphragm Displacement Volume (Vd) 695cc Mechanical Compliance of Suspension (Cms) 0.24mm/N BL Product (BL) 22.1 T-M Diaphram Mass inc. Airload (Mms) 130 grams Efficiency Bandwidth Product (EBP) 93 Maximum Linear Excursion (Xmax) 6.1mm Surface Area of Cone (Sd) 1140.0 cm2 Maximum Mechanical Limit (Xlim) 18.0mm MOUNTING INFORMATION Recommended Enclosure Sealed Vented 93-212 liters/3.3-7.5 cu.ft. Overall Diameter 18", 457.2mm Baffle Hole Diameter 16.56", 420.5mm Front Sealing Gasket fitted as standard Rear Sealing Gasket fitted as standard Mounting Holes Diameter 0.28", 7.1mm Mounting Holes B.C. D. 17.25", 438.2mm Depth 8.15", 207mm Net Weight 24.5 lbs., 11.1 kg Shipping Weight 28.1 lbs., 12.8 kg MATERIALS OF CONSTRUCTION Coil Construction Copper voice coil Coil Former Polyimide former Magnet Composition Ferrite magnet Core Details Vented and extended core Basket Materials Die-cast aluminum basket Cone Composition Paper Cone Cone Edge Composition Cloth cone edge Dustcap Composition Solid composition paper dust cap a 18 inch 8 ohm 650watt\