Product Name: Heavy Duty 18 Inch Professional Audio Best PRO Speaker Subwoofer Model NO.: HDW-1868 THD: 0.005%-0.01% Monitor: None Application: Commercial, Stage, Theater, Live Show Speaker Material: metal Speaker System: Mono Operation Mode: Wire / Remote Control Activity: Passive Hi-Fi: Not Hi-Fi Noise: <95dB Sensitivity: 97 dB Voice Coil Diameter: 100mm / 4 Inch Voice Coil Material: Copper Basket: Cast Aluminium Frequency Range: 33.4-1.8K Hz Type: Subwoofer Magnet: 220*2 Ferrite Trademark: OEM and ODM are both welcome Transport Package: by Carton or as Your Requirement Specification: Net Weight: 18.85KG Origin: China HS Code: 851829000 Product Description Heavy Duty 18 Inch Professional Audio Best Pro Speaker SubwooferProduct main features:- 18 inch PA speaker- Ideal for subwoofer- 900W RMS, 98dB- 4 inch voice coil, 220mm dual magnets - Subwoofer is ideal for high quality professional bass reflex and bass horn systemsGeneral SpecificationsNominal Diameter460/18mm/inchRated Impedance8ohmNominal Power handling900WattsProgram Power1800WattsSensitivity(lw/lm)97dBFrequency Range33.4-1.8KHzMinimum Impedance(Zmin)5.6ohmVoice Coil Diameter100/4mm/inchVoice Coil MaterialcopperNumber of layers2Magnet gap depth14mmSurround ShapeW-rollBasketCast AluminumMagnet220*2 FerriteMounting InformationOverall Diameter469mmBolt Circle Diameter448mmBaffle Cutout Diameter424mmOverall Depth236mmNet Weight18.85kgShipping weight20.1kgShipping Box490*490*260mmThiele-Small ParametersResonance frequency33.435.5HzDC resistance5.65.6ohmMechanical factor9.894.99Electrical factor0.440.41Total factor0.420.38Mechanical compliance0.090.06mm/NMechanical resistance5.515.6mech-ohmof suspension lossesEffective Moving Mass261.4349.2grHalf-space efficiency1.431.21%BL Factor26.532.6T.mEquivalent Cas air load173.9115.2litersVoice-coil inductance1.11.2mH