Ever since I picked up my beater Boxster it had this rattle, buzzing sound when I played tunes with a lot of bass. I took apart the rear speaker deck and found out why! It looks like the previous owner must have dropped it as I can see where touch up paint was used. I secured the horn area where it was rattling and will figure how to patch the piece missing. At least for now I can play tunes without the annoying sounds.
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