I've just started trying to figure out what to do with a pair of SMGa's. I bought them used 12 years ago. For the last 2 years they have become progressively muddier, but with no rattle. There looks like corrosion on the wires, both main panel and tweeker, but the wires haven't lifted off the mylar much. I wondered for a while if my amp was going, but it drives a pair of psb's to high volume with no problem.I want advice more than to sell them. But since you were nearby (I'm in Madison), I thought I would respond.