custom inclosure built out of Russian baltic birch best wood there is double baffled cut out is 5.94 .4 cubes air space with 6.3 cubic in. of port area 2 2 in. Aero ports that are 31 in. long tuned to 34 hz size is 19.75x11x7.75 if your looking for a spl box this is it will last forever solid as rock read my reviews ty any question just ask can build for other subwoofers too