(2) Rockville W12K7-D4 CEA-2031 Compliant 12 3600W Dual 4-Ohm Car Subwoofers Rockville W12K7-D4 CEA-2031 Compliant 12 1800 Watt Car Subwoofer Titan Series Dual 4-Ohm Sub CEA Power: 450 Watts Inverted Poly Concave Dust Cap Fiber Reinforced Ultra Stiff Paper Composite Cone Expanded and Rolled Steel Basket