The Strength of Kevlar We reinforce the woofer's cone with Kevlar, providing a rigid and lightweight design that eliminates flex under high power applications, improving bass response | Butyl Rubber Surround The high density, butyl rubber, half-roll surround allows full excursion capabilities of the woofer's cone, while maintaining linear movement control | Spider Plateau Venting Our proprietary spider design provides additional cooling for the voice coil assembly, increasing the woofer's life, as well as improving frequency response | Maximum Motor Performance The motor structure is optimized for maximum magnetic force for power efficiency, while the bumped backplate extends the excursion capabilities, all while aiding in voice coil cooling |