Home Cinema Sub-woofer Velodyne Digital Drive DD-18 BGE, THX Ultra 2, The Ultimate home theatre Sub Simply extraordinary power and depth, sensational integration, sophisticated equalisation system It??s huge, and heavy nothing can rival it for movie muscle 18in-diameter Kevlar-reinforced drive unit (that’s nearly 46cm ) The Velodyne packs 1250 watts of Class D digital amplification, delivering a claimed low-frequency response down to 14Hz. The DD-18 includes video outputs and on-board low-frequency equalization, designed to help you accurately integrate its output into your system. The Velodyne can highlight the specific acoustic strengths and weaknesses of your room, or where you’ve chosen to place your sub-woofer within it ?? or both.