Nominal Basket Diameter: 12", 304.8mm Nominal Impedance: 16 ohms Power Rating Watts: 50W Music Program: N/A Resonance: 101Hz Usable Frequency Range: 70Hz - 5.5kHz Sensitivity: 100.3dB * Magnet Weight: 38 ounce Gap Height: 0.31", 7.92mm Voice Coil Diameter: 1.75", 44.5mm THIELE and SMALL PARAMETERS Resonant Frequency (FS): 101Hz DC Resistance (Re): 14 * 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