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Power Rating Watts 75W Music Program Resonance 103Hz Usable Frequency Range 70Hz-5.3kHz Sensitivity 102 Magnet Weight 56 ounce Gap Height 0.312", 7.92mm Voice Coil Diameter 1.75", 44.5mm THIELE and SMALL PARAMETERS Resonant Frequency (FS) 103Hz DC Resistance (Re) 14.0 Coil Inductance (Le) 0.70mH Mechanical Q (QMS) 12.51 Electromagnetic Q (QES) 0.66 Total Q (QTS) 0.63 Compliance Equivalent Volume (Vas) 32.8 liters / 1.2 cu.ft. Mechanical Compliance of Suspension (CMS) 0.09mm/N BL Product (BL) 19.5 T-M Diaphragm Mass Inc. Air load (Mms) 28 grams Efficiency Bandwidth Product (EBP) 157 Maximum Linear Excursion (XMAX) 1.2mm Surface Area of Cone (SD) 519.5 cm2 Maximum Mechanical Limit (XLIM) MOUNTING INFORMATION Recommended Enclosure Sealed Acceptable Vented Acceptable Overall Diameter 12.02", 305.3mm Baffle Hole Diameter 10.97", 278.6mm Front Sealing Gasket fitted as standard Rear Sealing Gasket fitted as standard Mounting Holes Diameter 0.25", 6.4mm Mounting Holes B.C. D. 11.63", 295.4mm Depth 5.2", 132mm Net Weight 10.8 lbs., 4.9 kg Shipping Weight 12.6 lbs., 5.7 kg MATERIALS OF CONSTRUCTION Coil Construction Copper voice coil Former Nomex former Magnet Composition Ferrite magnet Core Details Non-vented core Basket Materials Pressed steel basket Cone Composition Paper Cone Edge Composition Paper cone edge Dust cap Composition Zurette dust cap