I put this in amps because these are powered; I dunno where pa stuff is supposed to go. I just bought a very used pair of 15" JBL Eon speakers. The plastic cabs are all scuffed up. Does anybody have ideas on how to make them look nicer? I don't need them to be perfect, it's just that once in awhile I need to make a professional impression, and beat looking gear doesn't impress non-musos even if it sounds good.