Purchased these 2 speakers right before Christmas played them up until a month ago, had them under the rear seat of my Denali hd being pushed with a fosgate amp. There is a little rub mark on the cone where I think they touched the carpet. They hit hard no problems, I can't tell the difference in these and the normal 12's just these fit under the seat.  I can tell you they had a long break in period, so if you have heard these new and didn't think they sounded good they need to break in. I have all the paperwork and hardware that comes with them. They still have 18 months of warranty left. I also have a box for a late model gm double cab but it's just to heavy to ship, local pickup and we can make a deal.