The KS LT118A SUB is a vented subwoofer equipped with a single custom high power 18” Subwoofer with 4” high-power sandwich copper voice coil on fiberglass former, double spider, ceramic magnet, and weather resistant cone. The enclosure is made with a 18mm multi-layer plywood, finished with anti-scratch black paint, with a strong perforated metal grille, four handles, one pole socket for satellite and four wheels