Voice Coil: 3" Quad 2 Ohm Mounting: 8 5/8" Hole Cut Out: 13 3/4" Outer Diameter: 15 1/4" Designed specifically for the competition environment, Audiobahn presents the IMMORTAL Series subwoofers. Their quad 2 ohm voice coils can handle up to 2250 watts of continuous power. They feature design elements like 200oz. triple-stacked Strontium magnets, proprietary tall excursion foam surrounds, and 25mm top plates, all ensuring maximum cone excursion and subwoofer efficiency. The Audiobahn IMMORTAL series subwoofers packages these advanced qualities into an ultradurable, cosmetically-appealing, chromed 3-dimensional die cast aluminum basket. CONE: The ultra-light 2-layer laminated carbon fiber Kevlar cone features an aluminum dustcap, making the cone rigid as well as lightweight.