Rockford Fosgate P300-12 12" 300W Sealed Powered Subwoofer Sub Enclosure+Amp Kit Rockford Fosgate P300 12 12" 300 Watt Single Powered Subwoofer Sub Enclosure Power Handling: 300 Watts RMS "Closed loop" design ensures optimum performance between woofer, amplifier and enclosure Built in 0/180 phase switch Separate low level and speaker level inputs