Apocalypse AP10 Quick Specs - 1000Watt - Cast Aluminum Basket - Double stacked magnet - Long excursion 2-1/2 inch high temp voice coil - Nitride butyl rubber surround * Rigid Die cast aluminum basket * Organic long fiber non-pressed cone body for accurate tight bass * Curvilinear Kevlar reinforced cone body * Extended neck joints on cone, coil and spider strengthen the integrity of moving structure for    high power capacity * Butyl rubber surround heavy duty and forever lasting. * Compressed mounting ring gasket * Vented coil for extra heat dissipation * 2-1/2 inch high temp aluminum voice coil * extended, machined cut one piece back plate * Powerful 1 inch thick 90 oz high energy magnet * 2-1/2 inch long excursion motor structure * Reinforced resin impregnated polycotton spider extend the life span of the speaker from       material fatigue and collapse. * Integrated heavy duty lead wire on spider prevent short circuit and melt down