Rockford fosgate p3sd2 is a subwoofer from rockford fosgate. It is a very well-known companies all over the world for making subs. Its latest edition is the P3 series. The p3 series is known for its punchy bass. P3sd2 is an 8 inch ultra shallow subwoofer. But it can give you a very punchy bass. It’s best thing is it has a shallow mounting depth. Its mounting depth is less than 3 inches.