CPS Extended Service Plan (more info)
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i got these running on a 1500W SSL amp and they hit hard the box is very nice but kind of poorly built the carpet comes off the inside and you have to tighten the screws in the plexy often.
I bought these subs for my custom 97 mountaineer and let me say, for the price i payed, DAMN! these things pound. Im running a 1000 watt amp and they sound great. I would highly recommend them. Thank you OnlineCarStereo!