This car audio package includes 1 Q Power 4-hole 12-inch subwoofer enclosure and 4 Planet Audio 12-inch subwoofers. The Q Power 4 Hole 12 Inch Sealed Divided Subwoofer Enclosure holds 4 speakers or subwoofers, up to 12 inches in diameter, with 1 cubic foot of space per sub. It's constructed with 5/8 inch MDF and covered in premium charcoal colored carpeting. It also features easy push button terminals and a sealed design. The Planet Audio 12 Inch 1800W Dual 4 Ohm Voice Coil Car Audio Subwoofer can handle 1800 watts of MAX power and 900 watts of RMS power. Other features include a mounting depth of 5 3/8 inches and an impedance of 4 ohms. With a 2 inch voice coil and 88 dB efficiency, you are really getting an incredible deal on this subwoofer. Please note, this subwoofer is not a CEA 2006 compliant, therefore is not true wattage rated!