Rockford Fosgate P300-10 Punch Powered Loaded 10-Inch Subwoofer Enclosure "Closed-loop" design ensures optimum performance between woofer, amplifier and enclosure. Frequency Response: 35Hz to 150Hz Constructed with 5/8-Inch MDF 11 AWG input terminals Crossover Controls: Variable 50Hz to 200Hz @ 12dB/Octave Butterworth Thermal and over voltage protection