I purchased my STF-2 right before the holidays, and it sat there in the box unopened until this past Monday. I had been reading about the problem on the Hsu forum, so I sent an email to Hsu, which is when I got the reply from Dr. Hsu. Once I had it hooked up with my new Axioms, the first thing I played was Finding Nemo...it is scene 25 I believe. (I played it enough to remember, if that tells you anything)
When I heard the "distortion", I just packed it back up and took it back to CompUSA. I didn't need to play anything else. Other posts have said that the distortion was as loud as the bass, but I didn't experience it at that level. Mine was just loud enough to be noticeable. I can't see how this one scene would damage your sub, since the defect was a manufacturing one at the factory. Let me know what you find when you test yours...