DESC: Velodyne has achieved digital perfection with the Digital Drive Series subwoofers. The series consists of 4 digital subwoofers the DD-10 (10 driver, 8 piston diameter), the DD-12 (12 driver, 9.7 piston diameter), the DD-15 (15 driver, 12.7 piston diameter), and the DD-18 (massive 18 driver, 15.2 piston diameter). The Digital Drive Series features Velodynes revolutionary Digital Drive room management technology that takes subwoofer room equalization to a new level. This latest Velodyne innovation allows the subwoofers frequency response in any room to be measured and digitally corrected in real-time using a supplied microphone, and stored in the units memory to assure ideal performance in the consumers listening area.