Power Rating Watts 300W Music Program Resonance 51.Hz Usable Frequency Range 45Hz-3.0kHz Sensitivity 96.9 Magnet Weight 56 ounce Gap Height .38″, 9.53mm Voice Coil Diameter 2.5″, 63.5mm THIELE and SMALL PARAMETERS Resonant Frequency (FS) 51Hz DC Resistance (Re) 2.9 Coil Inductance (Le) 0.80mH Download PDF Spec Sheet Mechanical Q (QMS) 4.94 Electromagnetic Q (QES) 0.54 [Description & reviews]