MB Quart Formula FWA304D 12" DVC 4-Ohm Subwoofer 12 DVC 300 Watts, 600 Maxx Watt Power, 4-Ohm Subwoofer Ultra-rigid pressed pulp cone with high-extrusion rubber surround adds super low frequency response, durability and great sound UV stabilized rubber surround permits the subwoofer cone to act like a stiff piston eliminating distortion and providing more accurate bass High-energy magnet dissipates heat; Front-plate and multi-layer high temperature voice-coil cooling for added reliability Black chrome gasket and impact resistant magnet cover add to the overall structural rigidity; Woven spider tinsel-leads