I just got a pair of Cerwin Vega RE-30's (I posted already about a busted tweeter). I found a guy nearby who can repair the tweeter... he says for $85 he can give them a tune up that will really mature the speakers. Is this kind of thing for real, or a load of hooey? Also, is it the kind of thing I could do by myself with a stethoscope and an allan wrench or something?