or could it be the amp thats making the sub make the noise? it kinda sounded like wood rattling, so i tore my whole trunk apart and built a new box in there 2 days ago, now its not as loud, and the noise is still there when i turn it up
Looks out of alignment. Especially if there is wear on the inside of the former. MT's have a very tight gap normally, so any slight misalignment would cause this problem.