Some 15 years after the Velodyne F-Series took the world by storm with the advance closed-loop servo feedback driver, Velodyne now offers THE complete package when it comes to subwoofer technology.This unit comes with advanced DSP processing, self calibrating (with microphone) and excellent performance in music and hometheater environments. Build quality is second to none; compact size is easy to work with and the full compliment of state-of-the art inputs and control(s) make this subwoofer the best value out there.Driver sizes range from 8" up to 15" and all models perform very well.Demo one of these bad boys at your local dealer...you'll be extremely impressed.