WOOFER LF18X451 Professional Low Frequency Transducer PART NUMBER 11100091 Incredibly linear frequency response characteristics, the highest power handling of any comparable 18-inch transducer, the lowest power compression. The LF18X451 features a fibre loaded cone assembly along with a high excursion triple roll, constant geometry surround: this combination provides remarkable strength and 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 and incredible power handling. A double silicon spider system ensures excellent control during large excursions. A fully optimised T-pole design generate the minimum amount of flux modulation. Features . .. .. .. . . 4.5 - inch, fibreglass inside-outside copper voice coil 3600 Watt continuous program power handling 97 dB Sensitivity 30 Hz - 1 kHz Frequency range 30.5 T/m BL 54 mm peak-to-peak excursion Applications The LF18X451 is ideal in applications where combinations of incredible power handling, reasonable weight and 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 subwoofer systems. Dual-forced hyper-venting and 15mm top plate for minimum power compression Dual spider design with silicon based dampening control Triple-roll surround and corrugated straight cone geometry 30 20 1000 100 1.000 10.000 20.000 General Specifications Nominal Diameter Rated Impedance Program Power 1 Power handling capacity 2 Sensitivity 3 Frequency Range Effective Piston Diameter Max Excursion Before Damage (peak to peak) Minimum Impedance Voice Coil Diameter Voice Coil Material Voice coil former material Voice Coil Winding Depth Number of layers Kind of layer Top Plate Thickness Cone Material Cone Design Surround Material Surround Design Ø 465 mm 18 mm 194 mm Thiele - Small Parameters Resonance frequency DC resistance Mechanical factor Electrical factor Total factor BL Factor Effective Moving Mass Equivalent Cas air load Effettive piston area Max. linear excursion (mathematical) 5 Voice - coil inductance @ 1KHz Half-space efficiency Ø 245 mm Ø 421 mm LF18X451 110 SPL, 1w/1m (dB) 100 90 80 20 100 1.000 10.000 20.000 Frequency (Hz) Frequency response curve of the loudspeaker make in a in hemispherical, free field in a reflex box with in anainternal Frequency response curve of the loudspeaker taken a hemispherical, free and fieldmounted environment and mounted volume 160with litresanand tuned volume at 38Hz,ofapplying a sinusoidal of 2.83theV @8 closedofbox internal 600 litres (21,2 cu.ft)signal enclosing rearatof 1m. the driver. Impedance (ohms) 316 100 460 / 18 8 3600 1800 97 30-1000 395 / 15,6 54 / 2,12 6,8 115 / 4.5 Copper Fiberglass 34 / 1,33 2 inside/outside 15 / 0,6 No pressed pulp Straight Polycotton Triple roll mm/inch ohm Watts Watts dB Hz mm/inch mm/inch ohm mm/inch 30 5,4 6,7 0,29 0,28 30,5 260 220 0,122 13,5 2,6 1,90 Hz ohm T·m gr liters m2 mm mH % 465 / 18,3 442-447 / 17,4-17,6 6,5 / 0,25 424 / 16,7 424 / 16,7 194 / 7,63 6,5 / 0,23 mm/inch mm/inch mm/inch mm/inch mm/inch mm/inch liters/ft3 15,2 / 33,4 16,2 / 35,5 Kg/Lbs Kg/ Lbs mm/inch mm/inch 4 Fs Re Qms Qes Qts BL Mms Vas Sd Xmax Le1K Eff Mounting Information Overall Diameter Bolt Circle Diameter Bolt Hole Diameter Front Mount Baffle Cut-out Rear Mount Baffle Cut-out Depth Volume occupied by the driver 6 10 Shipping Information 20 100 1.000 Frequency (Hz) 10.000 20.000 Net Weight Shipping Weight Impedance magnitude curve measured in free air. Notes to Specifications 1 Program Power is defined as 3 dB greater than AES power. - 2 AES standard. - 3 Sensitivity measurement is based on a 500-2,5 kHz pink noise signal with input power of 2.83V @ 8 Ohms. - 4 Thiele-Small parameters are measured after a 2 hour warm up period running the loudspeaker at full power handling capacity. - 5 The maximum linear excursion is calculated as: (Hvc - Hg)/2 + Hg/4 where Hvc is the voice coil depth and Hg the gap depth. - 6 Calculated for front mounting on 18 mm thick board.