Power Rating Watts 250W Music Program 500W Resonance 53Hz Usable Frequency Range 51Hz-3.8kHz Sensitivity 97 Magnet Weight 34 ounce Gap Height 0.312", 7.92mm Voice Coil Diameter 2", 50.8mm THIELE and SMALL PARAMETERS Resonant Frequency (FS) 53Hz DC Resistance (Re) 5.75 Coil Inductance (Le) 0.67mH Mechanical Q (QMS) 8.14 Electromagnetic Q (QES) 0.52 Total Q (QTS) 0.49 Compliance Equivalent Volume (Vas) 60.1 liters / 2.1 cu.ft. Peak Diaphragm Displacement Volume (VD) 102cc Mechanical Compliance of Suspension (CMS) 0.36mm/N BL Product (BL) 9.6 T-M Diaphragm Mass Inc. Air load (Mms) 25 grams Efficiency Bandwidth Product (EBP) 103 Maximum Linear Excursion (XMAX) 3.0mm Surface Area of Cone (SD) 344.9 cm2 Maximum Mechanical Limit (XLIM) 8.6mm MOUNTING INFORMATION Recommended Enclosure Sealed 8.5-14.2 liters/0.3-0.5 cu.ft. Vented 19.8-70.8 liters/0.7-2.5 cu.ft. Overall Diameter 10.11", 256.8mm Baffle Hole Diameter 9.13", 231.8mm Front Sealing Gasket fitted as standard Rear Sealing Gasket fitted as standard Mounting Holes Diameter 0.23", 5.7mm Mounting Holes B.C. D. 9.6", 243.8mm Depth 3.98", 101mm Net Weight 6.8 lbs., 3.1 kg Shipping Weight 7.8 lbs., 3.6 kg MATERIALS OF CONSTRUCTION Coil Construction Aluminum voice coil Former Polyimide former Magnet Composition Ferrite magnet Core Details Vented core Basket Materials Pressed steel basket Cone Composition Paper Cone Edge Composition Cloth cone edge Dust cap Composition Solid composition paper dust cap