UPDATE
I spoke with Chad today. I was told that I probably burned up one of the voice coils by either clipping the signal real bad, or there is a mechanical problem with the sub. A mechanical problem = new sub for no cost. A burned vc = my problem and I guess a recone.
My problem is this. I babied that SOB like my I baby my genitals. Its brand new and I treated it like the rest of my audio stuff that has lasted me eons. I have never blown a sub, ever. I bought this sub for SQ, not SPL. He tried telling me in an around about way that everyone calls telling him "I only gave the sub 50 watts and barely played it." That kinda pissed me off stereotyping me like that. I'm a 30yr old married man with a family. I know how to care for my audio/visual stuff.
Now, if the vc is damaged, it sure as hell isn't from overpowering. 600 watts never even got this sub near full excursion in a 1.2 cu ft sealed box. I set my gains with the Autosound set up discs and instructional manual. I have an Arc Audio single vc 4ohm sub that I have pushed way beyond its limits and that sub just begs for more abuse, and takes it.
One more note. On closer observation, the top magnet does appear to be shifted significantly more to one side. It is far from centered around the motor, but is that really a problem?
I will be shipping the sub back in the morning. I will be very shocked and baffled to hear if a vc is damaged. He said it would only take him seconds to tell what the problem is. The question is, do I really want a sub that burns up (if'n it is) without even getting down on it and pushing it? Maybe a got a bad one. Who knows.
I knew I should have bought that Arc Audio 12D4.