4.PA speaker:subwoofer with 6" inside/outside voice coil, 5.Speaker's Details: General Specifications Nominal Diameter460/18mm/inchRated Impedance8ohmNominal Power handling1700WattsProgram Power21400WattsSensitivity(lw/lm)398dBFrequency Range439-1.0KHzMinimum Impedance(Zmin)7.0ohmVoice Coil Diameter100/4mm/inchVoice Coil MaterialCopperVoice Coil Winding Depth23mmNumber of layers2(Inside/Outside)Magnet gap depth12mmSurround ShapeTriple-rollBasketCastAluminumFlux Density1.1TMagnet Material/MassCeramic Thiele-Small parameters Resonance frequencyFs39HzDC resistanceRe5.4ohmMechanical factorQms14.2Electrical factorQes0.41Total factorQts0.39Mechanical complianceCms0.10mm/NMechanical resistance of suspension lossesRms2.8mech-ohmEffective Moving MassMms160grHalf-space efficiencyEff3.0%BL FactorBL22.9T.mEquivalent Cas air loadVas207litersEffective piston areaSd0.1213m2Max.linear excursionXmax8mmVoice-coil inductanceLelK1.89mH Mounting Information Overall Diameter466.5mmBolt Circle Diameter442mmBolt Hole Diameter6.5x5.5mmBaffle Cutout Diameter423mmOverall Depth202mmNet Weight12.8kg