i had an l7 hooked up to a t300.2 rockford amp and i was showin it off with some bass tracks and alla sudden it quit workin i touched the cone and it was hot enough to burn you same with the magnet i took it out of the box and looked around the cone and it looks like this black stuff had melted and fell on the beck of the cone and at the bottom around the vc it was pretty much ripped apart... what happened?