yeah, after i ran the sweep on the resonix and saw the result my jaw dropped. Before then we had only done side by side "knocking" tests. sds on one door, resonix on another. we knew the resonix was doing a better job at controlling resonance, but we didnt know to what degree. this was able to put a number on it. I admit, its not a perfect test by any means, but it was apples to apples.