this is a little embarrassing because it was only yesterday i told someone that it stopped, but here we are. Discussions here made me curious to check a few things out, so i unplugged my 4 channel so that i couldnt hear those mids and highs, and listened to the sub specifically. When i sat in my front seat i couldnt really pick it up, but my sister said she heard some rattling. I went to the box and sure enough, one of my subs was making that rattle again. So i took them out of the box and tested them both individually. one sub sounded fine, the other was rattling constantly. not sure if it ever truely went away or if i just could never hear it over my mids, but it worries me. The sub receives the same power as the other, it just seems like maybe a piece of the sub is hitting another? i truely dont think i clipped these already, ive been very safe about that and when my last issue occurred i never turned it up again just because i knew something was wrong. is this something i should contact sundown about?