Upgrade your bass with the tried and true design of a Hertz enclosed car subwoofer. Chose sealed subwoofers for the most accurate sound, vented boxes for a lot of slam and bandpass enclosure for a whole lot of slam. There are subwoofer cubes, rectangular dual subwoofer boxes and even bass tubes to put in the trunk. You also can get an enclosed subwoofer with amp if you drive a vehicle with limited cabin space. We ship free in the lower 48 states.