Specifications Dynamic Power Handling: 4000 Watts Nominal Power Handling: 2000 Watts Impedance: Dual 4Ω Voice Coil Resonant Frequency (fs): 30.155 Hz D.C. Voice Coil Resistance (Re): 2 x 3.2Ω Mechanical Quality Factor (Qms): 3.378 Electrical Quality Factor (Qes): 0.792 Total Quality Factor (Qts): 0.641 Equivalent Air Volume (Vas): 30.026 L Mass of Diaphragm/Coil (Mms): 354.524 g Mechanical Compliance of Suspension (CMS): 78.576 mm/N Force Factor (BL): 23.304 Sound Pressure Level (SPL): 82.0 dB X