18 Inch Loudpeaker, 4 Inch Copper Voice Coil, Subwoofer Neodymium Magnet

18 Inch loudpeaker ,4 Inch Copper Voice Coil,  Subwoofer Neodymium magnet    General SpecificationsNominal Diameter18mm/inchRated Impedance8ohmNominal Power handling800WattsProgram Power1600WattsSensitivity(lw/lm)98dBFrequency Range35.5-1.6KHzMinimum Impedance(Zmin)5.6ohmVoice Coil Diameter100/4mm/inchVoice Coil Materialcopper Number of layers2 Surround ShapeW-roll BasketCast Aluminium MagnetNeodymium Mounting InformationOverall Diameter461mmBolt Circle Diameter444mmBaffle Cutout Diameter422mmOverall Depth212mmNet Weight8.95kgShipping weight10.1kgShipping Box490*490*250mm  Thiele-Small ParametersResonance frequencyFs35.5HzDC resistanceRe5.6ohmMechanical factorQms4.99 Electrical factorQes0.41 Total factorQts0.38 Mechanical complianceCms0.06mm/NMechanical resistanceRms15.6mech-ohmof suspension lossesEffective Moving MassMms349.2grHalf-space efficiencyEff1.21%BL FactorBL32.6T.mEquivalent Cas air loadVas115.2litersVoice-coil inductanceLelK1.2mHINTRODUCTION Hengda Audio is a professinal speaker manufacturer with experience in the PA speaker field for 10years. We make  different tranducers, compression drivers. We not only provide goods but technology. OEM and ODM are both welcome.   /* March 10, 2023 17:59:20 */!function(){function s(e,r){var a,o={};try{e&&e.split(",").forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1