Atlantic Technology 642eSB-GLB THX Certified 12" Powered Subwoofer, 350-Watt (Single, Gloss Black) Physical Characteristics-Height-21.0; Physical Characteristics-Width-19.0; Physical Characteristics-Weight (Approximate)-65.00 lb; THX-approved powered sub High efficiency tracking amplifier Has the smoothest in-room bass response (as well as achieving even higher bass sound sound pressure levels) High performance electronic crossover with Clear Filter Technology Front panel level control