18-in Extended LF Neodymium Driver w/Carbon fiber reinforced cellulose cone 4 Ohms Weather protecte

96 dB SPL 1W / 1m average sensitivity 135 mm 5.3 in split winding four layers ISV aluminum voice coil 3600 W program power handling Carbon fiber reinforced cellulose cone Double Silicon Spider DSS for improved excursion control Aluminum demodulating ring SDR for lower distortion High force neodymium magnet assembly Weather protected cone and plates for outdoor usage Suitable for reflex. bandpass or horn loaded high SPL subwoofer systems Nominal Diameter 462mm 18 in Rated Impedance 4 Ohms AES Power 1800W Peak Power 3600W 4-Ohms Frequency Range 30 - 2300 Hz Power Compression -10dB 0.7 dB Power Compression -3dB 1.3 dB Power Compression Full Power 2.2 dB Max Recomm. Frequency 300 Hz Recomm. Enclosure Volume 110 - 350 It. 3.89 - 12.36 cuft Minimum Impedance 6.1 Ohm at 25 DegreesC Max Peak To Peak Excursion 70 mm 2.75 in Voice Coil Diameter 135 mm 5.3 in Voice Coil winding material Auminum Suspension Triple Roll. Heavy Polycotton Cone Straight ribbed carbon fiber loaded cellulose THIELE SMALL PARAMETERS Fs 39 Hz Sd 0.113 sq.mt. 175.15 sq.in. Qms 5.70 Qes 0.30 Qts 0.28 Vas 120 It. 5.79 cuft Mms 255 gr. 0.6 Ib BI 31 Tm Linear Mathematical Xmas +/-14 mm +/-0.55 in Le 1kHz I 2.19 mH Ref. Efficiency 1W 1m half space 95.6 dB MOUNTING INFORMATION Overall diameter 462 mm 1 8.18 in N.of mounting holes and bolt 8 Mounting holes diameter 8.5 mrr0.33 in Bolt circle diameter 440mm 1732 in Front mount baffle cutout diameter 416 mm 16.38 in Rear mount baffle cutout diameter 422 mm 16.61 in Total depth 236 mm 9.29 in Flange and gasket thickness 26 mm 1.02 in Net weight 12.8 kg 27.6 Ib Shipping weight 14.3 kg 31.50 Ib CardBoard Packaging dimensions 482x482x25/ mm I 9x19x10.1 in