Features 4.0" High Temperature Voice Coil High Strength Ferrite Oxide magnet Treated Paper Cone with Cloth Surround Extreme Output Capability Die-Cast Aluminum EVA Mounting gasket Compression Speaker terminals Specifications Dynamic Power Handling: 4500 Watts Nominal Power Handling: 3000 Watts Impedance: 4Ω Voice Coil Resonant Frequency (fs): 64.7 Hz D.C. Voice Coil Resistance (Re): 4Ω Mechanical Quality Factor (Qms): 4.84 Electrical Quality Factor (Qes): 0.36 Total Quality Factor (Qts): 0.34 Eq