Power Rating Watts: 50W Music Program: N/A Resonance: 89.98Hz Usable Frequency Range: 80Hz - 5.1kHz Sensitivity: 100.9dB Magnet Weight: 35 ounce Gap Height: 0.31", 7.95mm Voice Coil Diameter: 1.75", 44.45mm THIELE and SMALL PARAMETERS: Resonant Frequency (FS): 89.98Hz DC Resistance (Re): 7.19 Coil Inductance (Le): 0.62mH Mechanical Q (QMS): 12.41 Electromagnetic Q (QES): 0.65 Total Q (QTS): 0.62 Compliance Equivalent Volume (Vas): 44.96 liters / 1.59 cu.ft. Peak Diaphragm Displacement Volume (VD): 62.34cc Mechanical Compliance of Suspension (CMS): 0.12mm/N BL Product (BL): 12.91 T-M Diaphragm Mass Inc. Air load (MMs): 26.55 grams Efficiency Bandwidth Product (EBP): 139 Maximum Linear Excursion (XMAX): 1.2mm Surface Area of Cone (SD): 519.5 cm2 Maximum Mechanical Limit (XLIM): N/A MOUNTING INFORMATION: Recommended Enclosure Volume: Sealed: Acceptable Vented: Acceptable Driver Volume Displaced: 136.7 cu.in. / 2.24 liters Overall Diameter: 12.02", 305.31mm Baffle Hole Diameter: 10.97", 278.64mm Front Sealing Gasket: Fitted as standard Rear Sealing Gasket: N/A Mounting Holes Diameter: 0.25", 6.35mm Mounting Holes B.C.D.: 11.63", 295.4mm Depth: 6.22", 157.98mm Net Weight: 8.5 lbs., 3.86 kg Shipping Weight: 11.1 lbs., 5 kilos MATERIALS OF CONSTRUCTION: Coil Construction: Copper voice coil Former: Paper former Magnet Composition: Alnico magnet Core Details: Non-vented core Basket Materials: Pressed steel basket Cone Composition: Paper Cone Edge Composition: Paper cone edge Du