This thread has derailed.
I don't care what anybody says, stick with the manufacture's power rating. Go ahead and run double or triple that power, but don't be upset or confused when you cook that subwoofer. Yeah there are guys here who run more than rated power, and yes, we can argue that they are more experienced or know more about the particular manufacture and how far they can push the limits of their products. The point is there's still a power rating, it's not for the people who don't know, its for the safety of the subwoofer itself. That's what it can safely handle for long periods of time. Sure you can go give it more, but you're taking that risk, not the subwoofer.
It's like sports cars. A Ferrari can go 350kmh, and everyone knows it can but you better be a damn good driver to go that fast or at least know what will happen if you make a mistake.