Both my EP500s had bad rattles from the get go. Called Axiom and they sent two new drivers. Rattles are gone. Awesome customer service. I too had pulled the drivers, and one the cone had pulled apart from the coil. On the other, when I pushed the cone in and out manually, it would not operate smoothly, causing the rattle. The first situation sounds more like yours. I would call Axiom right away. No need to live with it as it should not rattle. BTW, I bought my EP500s about 7 months ago. About when did you get yours? Just curious as to maybe you got into the same batch of drivers I got into.
