High Power 18-in Woofer w/4.5 - inch fiberglass Inside/Outside copper voice coil

Incredibly linear frequency response characteristics, the highest power handling of any comparable 18-in ch transducer, the lowest power compression.The LF18X451 features a fiber loaded cone assembly along w/a high excursion triple roll, constant geometry surround: this combination provides remarkable strength & a peak to peak maximum excursion of 54 mm. The new dual forced hyper-venting system guarantee a very efficient voice coil ventilation for minimum power compression & incredible power handling. A double silicon spider system ensures excellent control during large excursions. A fully optimized T-pole design generate the minimum amount of flux modulation.4,5 - inch fiberglass Inside/Outside copper voice coil3600 Watt continuous program power handling97 dB Sensitivity30 Hz - 1 kHz Frequency rangeDual Forced Hyper-venting SystemDual spider designed w/silicon based damping controlBL of 30.5 Txm to provide a faster & accurate low frequency The LF18X451 is ideal in applications where combinations of incredible power handling, reasonable weight & ultra fast time response are required. Perfect for powerful lows in horn loaded sub bass systems or reflex designs. Ideal for touring, find a perfect application in high power, heavy duty, club sub-wooferNominal Diameter: 460/18 mm/inchRated Impedance: 8 OhmsProgram Power: 3600 W AESPower handling capacity: 1800 W AESSensitivity: 97 dBFrequency Range: 30 Hz to 1000 HzEffective Piston Diameter: 395 / 15.6 mm/inchMax Excursion Before Damage peak to peak: 54/2.12 mm/inchMinimum Impedance: 6.8 OhmsVoice Coil Diameter: 115 / 4.5 mm/inchVoice Coil Material: CopperVoice Coil Winding Depth: 34 / 1.33 mm/inchNumber of layers: 2Kind of layer: inside / outsideTop Plate Thickness: 15 / 0.6 mm/inchCone Material: No pressed pulpCone Design: StraightSurround Material: PolycottonSurround Design: Triple rollTHIELE/SMALL PARAMETERSResonance frequency: 30 HzDC resistance: 5.4 OhmsMechanical factor: 6.7Electrical factor: 0.29Total factor: 0.28BL Factor: 30.5 T - mEffective Moving Mass: 260 gEquivalent Cas air load: 220 litersEffective piston area: 0.122 m-SquaredMax. linear excursion mathematical: 13.5 mmVoice - coil inductance at 1kHz: 2,9 mHHalf-space efficiency: 1.90%MOUNTING INFORMATIONOverall Diameter: 465 / 18.3 mm/inchBolt Circle Diameter: 442-447 / 17.4-17.6 mm/inchBolt Hole Diameter: 6.5 / 0.25 mm/inchFront Mount Baffle Cut-out: 424/16.7 mm/inchRear Mount Baffle Cut-out