How big of an amp do I need for a Rockford Fosgate Punch p3D410 Sub?

that is a 4ohm dvc ( dual voice coil ) 400 watt rms sub. you will have a 2ohm load. you can use a Kicker 08ZX4001 400 Watt Class D Mono Amplifier 400x1@2ohm. Check out wiring diagrams here. http://www.the12volt.com/caraudio/woofer_configurations.asp?Q=1&I=42. Hope this helps.
 
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