The Z series is the result of our ongoing study in the field of world subwoofer domination. The Z project represents the culmination of DD’s ultimate engineering goal which is to push the limits of delivered energy by utilizing high-performance composite technologies. The Z series takes its place as the flagship of the DD sub line by having the highest motor strength, greatest voice coil cooling capability, most overbuilt design features, and last but not least True To The Source sound reproduction.