DB DRIVE WDX 6.5 G1.4 SUBWOOFER 6.5" 4Ohm 600W 1.5″ BASV High Temperature Voice coil Non-Pressed paper cone Double stitched foam surround Dual poly-cotton dampeners Die-cast aluminum vented basket Rubber gasket trim ring Large gauge compression terminals Protective magnet cover GENERAL SPECIFICATIONS Structure6.5″ (16.51cm) Woofer Dynamic Power Handling600 Watts Nominal Power Handling300 Watts ImpedanceDual 4Ω Voice Coil PARAMETERS Resonant Frequency (fs)58.94Hz D.C. Voice Coil Resistance (Re)3.2 x 3.2Ω Mechanical Quality Factor (Qms)4.065 Electrical Quality Factor (Qes)0.823 Total Quality Factor (Qts)0.684 Equivalent Air Volume to Cms (Vas)2.749 L Mass of Diaphragm/Coil (Mms)77.157 g Force Factor (Bl)7.453 Sound Pressure Level (SPL)80.2 dB