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The Kicker SoloX L7X is an 18-inch competition subwoofer engineered to deliver extreme bass performance and handle immense power. It revives KICKER's advanced bass technology, featuring a field-replaceable recone kit that allows for cone, voice coil, and spider assembly replacement without the need for gluing. This subwoofer is equipped with KICKER's Forced Air Cooling™ system, a robust three-inch aluminum voice coil former, a dual-spider suspension for enhanced stability, and a double-pressed pulp cone for durability and optimal sound. Built with a heavy-duty UV-resistant Santoprene surround and a custom rubber magnet boot, the SoloX L7X also boasts a cast-aluminum basket for structural integrity and a powerful triple-stacked ferrite magnet. The rated impedance is 1 Ohm, with a recommended amplifier power range of 1000-2000 Watts RMS, and it delivers a frequency response from 18 Hz to 100 Hz. Key specifications include a voice coil diameter of 3 inches and a winding width of 2.5 inches, contributing to its high excursion capabilities (Xmax of 1.25 inches). The top plate thickness is 0.5 inches. For enclosure design, Kicker recommends a vented box volume of 7.5 cubic feet with a port opening of 6.5 x 19.5 inches and a port length of 27.75 inches, resulting in a vented enclosure tuning frequency of 28 Hz. Kicker warrants this product for one year from the date of original purchase when bought from an authorized dealer. It is important to note that performance claims assume typical music program with minimal amplifier clipping and will vary with enclosure size. Kicker also states that port volume is excluded from certain measurements and that product specifications are subject to change without notice.