I would appreciate some advice. I bought a HSU Research VTF-2 recently. When I was moving the thing I grabbed the bottom of the unit where the subwoofer speaker is located. Rather than resting my fingers on the edge of the unit, I rested them on the edge of the speaker. When I picked the thing up, I compressed the edge of the speaker. As soon as I felt what I was doing, I released the thing and the speaker edge rebounded back to it's original position. The subwoofer still sounds OK, but is it possible I damaged it. How would I test for damage? Any thoughts?