Well I found the cause of the buzzing noise in the left rear speaker of my E500. The cone is broken, and also unglued from the surround about 1/3 of the way around.
So I need a replacement. Before I order a new one, does anyone who upgraded to aftermarket stuff have a used one collecting dust they'd like to sell cheap? Most all late W124's use the same part. It's the kind with two attached tweeters. I need the driver's side rear. I can post a photo if necessary... thanks!
