I've got a JBL 4645C that just started to rattle whenever it plays low. I currently don't have any protection on it (i.e., high pass at 20Hz), though I have a MiniDSP in the mail to do just that as well as provide some low end boost around 25Hz as JBL recommends, but it's making a nasty rattling sound. Has anyone ever gotten this? I'm taking the 2242H out of the cabinet tomorrow to see if it's the driver or the box, but it sounds like the driver. I've never had a voice coil rub before, so I don't know if that's what this is. The bass isn't muddied or bad sounding; rather, it sounds great but has that rattle to it. Are there any parts of the woofer that would make it prone to rattle and, if so, how would I check to see which part of it is broken?