yea, its blown
10 bucks says you didnt know what you were doing and didnt set your amp settings right, which caused it to clip, distort, and eventually blow
...
10 bucks for me! yay!
get a new one, make sure your not overpowering it, make sure the RMS watts from the amp, and the RMS from the sub are the same, so their equal.. having less is fine, but more is what over powers it.