Rated For Up To 1250 Watt (RMS) Of Power. This 18"" High Power, Low Frequency Driver, Destined To Become One Of The Most Durable, High-Power Woofers Ever Manufactured. For Esoteric High Power Bass Applications. Frequency Response Of 25Hz-600Hz. (7 Year Warranty) * 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 Eminence