Product Name: Hot Sale 12 Inch PA Professional Woofer Loudspeaker for PRO Audio System Model NO.: HDW-1234 THD: <0.005% Monitor: None Application: Commercial, Home, Stage, Theater Speaker Material: metal Speaker System: Mono Operation Mode: Wire / Remote Control Activity: Passive Hi-Fi: Not Hi-Fi Noise: <95dB Sensitivity: 96.5 dB Voice Coil Material: Ccaw Program Power: 600 Watts Trademark: HD Transport Package: by Export Carton Specification: 12 inch woofer Origin: Guangzhou, China HS Code: 851829000 Product Description Hot Sale 12 Inch PA Professional Woofer Speaker for PRO Audio SystemGeneral SpecificationsNominal Diameter300/12mm/inchRated Impedance8ohmNominal Power handling300WattsProgram Power600WattsSensitivity(lw/lm)96.5dBFrequency Range43-2.6KHzMinimum Impedance(Zmin)5.6ohmVoice Coil Diameter75mm/inchVoice Coil MaterialCopper Clad AluminiumNumber of layers2Magnet gap depth8mmSurround ShapeW-rollBasketCast AluminiumMagnet190 FerriteMounting InformationOverall Diameter313mmBolt Circle Diameter295mmBaffle Cutout Diameter282mmOverall Depth138mmNet Weight7.1kgShipping weight7.66kgShipping Box320*320*150mmThiele-Small ParametersResonance frequencyFs43.9HzDC resistanceRe5.6ohmMechanical factorQms6.56Electrical factorQes0.29Total factorQts0.27Mechanical complianceCms0.25mm/NMechanical resistanceRms2.2mech-ohmof suspension lossesEffective Moving MassMms52.2grHalf-space efficiencyEff2.84%BL FactorBL16.8T.mEquivalent Cas air loadVas99.2litersVoice-coil inductanceLelK0.6mHINTRODUCTIonHengda Audio is a professinal speakermanufacturerwith experience in the PA speaker field for 10years. We makedifferent tranducers,compression drivers. We not only provide goods but technology. OEM and ODM are both welcome.