General SpecificationsStructure 8 (20.3cm) WooferDynamic Power Handling 800 WattsNominal Power Handling 400 WattsImpedance Dual 4 Voice CoilParametersResonant Frequency (fs) 41.702 HzD.C. Voice Coil Resistance (Re) 3.2 OHMS x 2Mechanical Quality Factor (Qms) 2.230Electrical Quality Factor (Qes) 0.447Sound Pressure Level (SPL) 84.3 dB