A one-way, non-enclosed, 12-inch subwoofer with a single 4ohm voice coil, the Pioneer TS-SW3002S4 features a distinctive design that requires only 3 to 3/8 inches of mounting depth. Able to handle 400 Watts nominal and 1500 Watts maximum power, it delivers great sound quality and bass of a full-sized subwoofer. With a compact design that can fit under or behind car seats, it offers many installation options.