I have an idea to deter theives if they get to the my subwoofers, the box atleast! Already have 2 eclipse DVC 15's, and a huge heavy box for them. I was wondering about adding weight plates on each side of the box (both chambers sealed). Maybe 2 35# weights, maybe 45#'s if I can fit them. This a good idea or no? I know the subwoofers have huge magnets and how much are they affected?