The Rockford Fosgate P2D4-8" Subwoofers are 500W dual 4-ohm punch car bass subwoofer speakers designed for car audio systems. These non-enclosed, non-powered speakers are 8 inches in size and feature a dual voice coil for enhanced performance. With a RMS power of 500W, these subwoofers from Rockford Fosgate deliver powerful and clear bass sound to enhance your car audio experience.