This 15″ subwoofer is designed with an improved voice coil cooling system allowing you to enjoy your music for a longer duration. ?This subwoofer has a 2500 Watts RMS and 10,000 Watts max music power. ?This subwoofer features a 4″ resin coated copper voice coil on an aluminum former. 4″ Resin Coated Copper Voice Coil on an Aluminum Former 2500 Watts RMS 5000 Watts Nominal 10,000 Watts Max Music Power Tri-Radius Symmetrical Surround 4″ Peak to Peak Travel Dual 4 Ohm Dual Flat Conex Spiders with Loop Stitched Tinsel Leads Quad Cooling System; Vented Former, Vented Basket, Heatsink Motor Field Replaceable Cone/Voice Coil/ Spider Assembly.