I thought this article was interesting:
Loudspeakers & Power Ratings Part III: The Test Results 
Upon inspection of the deceased, it became apparent why it took so much power to burn this speaker. The VC wire was wound on an Aluminum bobbin, which in turn was directly coupled to an aluminum cone. This combination of parts allowed much heat to be drawn away from the VC, keeping it cooler than almost all other 1” VC's of this height and size would be. Kudos to the designers at Axiom for an excellent design job.
