MTX Audio Road Thunder loaded enclosures offer an easy way to add legendary MTX bass to any vehicle. The angled trapezoidal shape fits in the trunk or hatch of virtually any car or truck, and the sealed design provides great sound quality. Loaded with two Road Thunder series subwoofers, these enclosures are ready for power and built to pound. Single 4-ohm load can be run from most 2-channel or mono amplifiers.