I was just looking at my Low B-2's drivers this afternoon, and I noticed that right where the cone meets the pleated surround there were little half-moon shaped. . . . well, I guess you could call them scrapes or slight gouges. I am trying to figure out what could do this? I am almost convinced that the speakers excursed all the way to the grill and rubbed against that. But that's crazy, right? So, the question is: Are there a variety of ways that cones can crease? I have seen first-hand bad creasing, but could these new marks be another type of creasing?