The Pioneer TS-A3000LB A Series Shallow Mount Pre Loaded Enclosure has a 12 in. subwoofer already positioned inside. Traditional subwoofer terminals are mounted horizontally or vertically. These mounts force wires to be bent to fit which can be difficult if low gauge high performance wires are used. The Pioneer shallow subwoofer’s patent-pending, angled push terminals make it easy to connect speaker wires. The straighter connection saves space and makes installation easier. And compact, space-saving dimensions make it easy to install the preloaded subwoofer enclosure in a variety of trucks—standard cab, extended cab, or crew cab.