IMF HP21

P Audio IMF HP21 SpecificationsHuge 4 Inch Voice Coil - 800 Watts RMS/1600 Watts Peak Power Handling - 97db/1 watt/1 meterMESSAGE with any questions!!!A Landmark in Professional Woofer Design Thiele-Small Parameters Resonant Fequency (fs) 39 Hz Impedance (Re) 5.3 ohms Coil Inductance (le) 0.mH Electromagnetic Q (Qes) 0. Mechanical Q (Qms) Total Q (Qts) 0. Compliance Eqiv. Volume liters Peak Diaphragm Displacement Vol. (Vd) N/A Mechanical Compliance of Suspension (Cms) BL Product (BL) 24.8 T-M Diaphragm Mass incl. Airload (Mms) grams Equivalent Resistance of Mech. Suspension Loss (Rms) N/A Efficiency Bandwidth Product (EBP) N/A Voice Coil Overhang (Xmax) mm Surface Area of Cone (Sd) 1660cm2 Impedance at Resonance (Zmax) N/A