I was playing around with my system, finishing the big 3, I went back and just watched my subs for a second. I thought "Man, why is right sub acting so funny?" so I unplugged it, and bridged the left sub. My box isn't sealed! My right sub would move anyway! Grr! Going to silicon it today. If I can find silicon.
On a side note, a 700w 15" sub, even wired at 8 ohm, will get KILLED by a 1200 watt amp. It must have been moving an inch in both directions. That can't be healthy. I don't think I blew it, though, since it doesn't distort at my usual levels.