PowerBass PS-WB112T Single 12-inch Thin Mount Loaded Enclosure (Grey) Air Suspension Bass - One Piece Injection Molded Cone 2" Vented KSV Voice Coil Formers Large Roll Rubber Surrounds Computer Optimized Acoustic Chamber Custom Mounting Brackets Single 12-inch Loaded Thin Mount Enclosure Power Handling (RMS/Peak): 300/600 watts Nominal Impedance: Single 4-ohm Input Frequency Response: 36Hz - 250Hz