hey guys, i got a nice pair of 6.5" coaxial speakers off of ebay from a great retailer. these sounded great for about two weeks but then i began to notice a "crackling" noise coming from one of the speakers. i have a cheap cd headunit that has never given me any problems. the problem gets worse when i turn up the bass. however, i have never listened to them at high volumes or "bumping" bass by any means. what in the world could this be? 🙁