Eighteen Sound 18NTLW5000.4 LF Driver 18-inch Next Generation Subwoofer 1800 Watts RMS 4000 Peak Designed for High Spl Very Low Frequency Applications 4-Ohms || "HIGHLIGHT : 95 dB SPL 1W / 1m average sensitivity || * Dual 115mm (4,5 in) Tetracoil Aluminum Voice coil || * 4000 W program power handling || * Ultra linear suspension behavior for excellent sound clarity || * Symmetric flux density and inductance behaviour || * Low noise forced air cooling design || * Water repellent cone and epoxy coated plates || * Suitable for vented, horn loaded and bandpass applications" || "SPECIFICATIONS || Nominal Impedance : 4 Ω || Minimum Impedance : 3.8 Ω || Nominal Power Handling1 : 1800 W || Continuous Power Handling2 : 4000 W || Sensitivity3 : 95.0 dB || Frequency Range : 35 - 1000 Hz || Voice Coil Diameter : 115 mm (4.5 in) || Winding Material : Aluminum || " || "DESIGN || Surround Shape : Triple roll || Cone Shape : Straight || Woofer Cone Treatment : Water, UV repellent || Recom. Enclosure : 180.0 dm3 (6.36 ft3) || Recom. Tuning : 35 Hz || MOUNTING & SHIPPING INFO || Overall Diameter : 462 mm (18.19 in) || Bolt Circle Diameter : 440 mm (17.32 in) || Baffle Cutout Diameter : 416.0 mm (16.38 in) || Depth : 310 mm (12.2 in) || Flange and Gasket Thickness : 26 mm (1.02 in) || Net Weight : 12.0 kg (26.46 lb) || Shipping Weight : 12.8 kg (28.22 lb) || " || The 18NTLW5000 is a 18 inch diameter next generation high performance subwoofer, specifically designed for high SPL very low frequency applications in either a reflex, bandpass or horn loaded configuration. The 18NTLW5000 uses Eighteen Sound proprietary Tetracoil technology, where two different, axially separated magnetic gaps and two inside-outside 4.5" diameter aluminum voice coils are wound on the same former and suspended evenly in the two magnetic gaps. || 18NTLW5000 design features include a large displacement suspension system which, in conjunction with a fiberglass reinforced, straight ribbed cone allows an ultra-linear piston action and provides full mechanical control across the entire working range. 18NTLW5000 is able to perform properly under inclement weather conditions: the exclusive cone treatment improves pulp strength and gives water repellent properties to both sides of the membrane.