Speedfreak

This is my first "high end" sub and I love it. Then I broke it, haha. It's been getting about 400 watts from an Alpine mono for about 3 months and gets played pretty hard. It's in the trunk of my s2000 and I really have it cranked with the top down on the interstate. I guess I'm still a newb but I like to think I know a little more than the average DA that walks in Best Buy or whatever. I've never blown up a sub and I never thought I'd have a problem with a driver of this quality. So, I know it's something I did or didn't do, just want to know what caused this and how to fix it. This is the enclosure I built for it. Just ignore the wire through the hole ghettoness. I hadn't got around to a terminal or carpet yet. Can the cone be fixed and can I do it myself? Thanks

Yeah, I loved the SQ. I obviously don't know what I'm doing here. How do I make it loud with out doing this. For all I know I just feed it power that it's rated for and adjust the crossovers on the amp and turn it up. I couldn't hear anything bad goin on, the bass just went away. Just tryin to learn something from this screw up.

The box is .52³ ft. Subsonic filter on the amp is 15Hz