Kenwood Excelon P-XW1221SHP 12" Ported Subwoofer Enclosure The rugged enclosure is built from 5/8" MDF with a 3/4" thick internal baffle to give the sub solid support. The box's slant-back design suppresses standing waves which can interfere with bass response, and allows it to fit neatly behind the rear seat of an SUV. Rounded port corners reduce port noise and airflow resistance. The P-XW1221SHP can be used in front-facing, rear-facing, or down-firing applications. Steel-mesh grilles protect t