Good afternoon, I recently purchased a pair of KEF C75 speakers at an auction. The bottom of one of the speakers disintegrated, and it appears that they had sustained water damage at some point. On that same speaker, once any volume is intruduced, the tweeter begins to crackle. I don't know if the tweeter is damaged, or if it is an issue with the crossover. I'm not a woodworker, so any repair I would do to the cabinet would be very rudimentary. I would appreciate any advice. Thank you!