The BOSE's MB12 low-frequency passive speaker are meant to supplement Bose LT arrays and other subwoofer applications with additional bass. When utilised with LT mid/high loudspeakers, the small 1 x 12" (305 mm) arrangement enables for minimal-height arrays. Using MB12 loudspeakers and Bose Modeler® tools and optional rigging hardware, directional bass arrays are simple to build and install.