The Eminence Kilomax Pro 18A PA Replacement Speaker is a perfect subwoofer for DJ rigs, touring subs, club subs, and bass guitar cabs. The Kilomax features a Kapton coil former for increased rigidity and thermal protection; a polyamide-coated, 2-layer copper voice coil for improved power handling and durability; ferrite magnet material; 0.25" extended core for greater cone travel and increased power handling; die-cast aluminum basket for rigidity; a paper cone; Kilomax aluminum heatsink to transfer heat from the motor structure; and core periphery ventilation. The Kilomax 18 woofer is best suited for standard ported enclosures.Kapton coil former for increased rigidity and thermal protection Polyamide-imide coated two-layer copper voice coil for improved power-handling and durability Ferrite Magnet 0.25" extended core for greater cone travel and increased power handling Die-cast aluminum basket for rigidity Paper cone Kilomax aluminum heatsink to transfer heat from the motor structure Core Periphery Ventilation