I second the "break in" statement on these subs, I remember when I first got mine it was stiff as hell, I put it in a medium ported enclosure putting about 1100 watts to it and sounded decent, but I didn't see all the hype to it, after about a week of bumping it it started to seem slightly louder, it seemed more power hungry so I turned up the gain on my amp a little and it really wangs now, I sh!t you not this thing bumps louder then my mofo 12 did and of course sounds a lot better (SQ) at the same time off less watts