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  1. 2nd Gen. 1&2 Series (2011-2021 | F20,F21,F22,F23)
    It only happens on certain songs and from I can tell only the front speakers. Occasionally I hear a sort of thump sound. Happens for a split second. At first I thought it was a knocking noise but since hearing again when stationary I can tell it's the speakers. As far as I know I've got the...
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