So I got a pair of these, they worked fine at first, however, after a few days one went defective and had to be returned, Sonic handled the exchange perfectly. So I got the replacement sub, they worked fine for a month, then one day out of the blue they blew, both of them. Mind you they weren't even hitting that hard at the time, half power. Everything was wired fine in the install. So my only conclusion is that these subs are not good quality like a lot of things from Hifonics.