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i dont think its from the speakers, i hear it when the cars on when i have some one rev it and im standing besides it. and when i rev it from the engine bay. rpms effect how loud it is. but i dont think its form the speakers
If it is more a high pitched whistle, change the serpentine belt tensioner. I had the one on my 4.7 in my Grand Cherokee make a high pitched noise. Chased it down to the tensioner, bearing in the tensioner must have been going.