Im no electrican by any means but I do read alot of car craft, and every time that subject is brought up they always ask about the plug wires whether they are shielded which might be causing the buzzing in the speakers. Does the buzzing speed up when the car is accelerated if it does I bet that might be the problem. I also have noticed that they sell noise suppresors which go inline to the radio circuit to keep out the same noise. Hope this helps!
Do you have an electric fuel pump? It could be causing this problem. I know cause there is a technical service bulletin on my 94 sable that has the problem. If it is the prob, you'll have to install a flter on the elect connection going to the pump. Just a thought.
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