CPS Extended Service Plan (more info)
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well first off it's a 8 not 10 or 12 but very bad ass for it's size and price you had it in a wrong size box or was way under powered i had 2 in a custom built box that i made and they hit so hard wow! is all i can say only herad one other 8 that sounded this good orion ext series but i made a box sealed and also enclosed it and added a port almost like a house sub would be so many way's to get good sound out of a 8 but the jbl's i had ran by a alpine mrp 500 bridged very good indeed best guess is you had them way under powerd