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Message: <blockquote data-quote="Fireblade" data-source="post: 50924" data-attributes="member: 221">Van,I had a similar problem a few weeks ago and the noise was really getting to me every time when hitting the low freq. Removed the rear parcel shelf and found the problem - it was the damping material on the left and right sides. Originally the damping material, it's something like a bitumen sheet, was stuck to the underside of the shelf. With age it hardened and eventually dropped off. It was then lying on top of the foam/sponge below the shelf. Everytime the low notes strike, the hardened damping material vibrates and transmits this to the shelf. Problem was solved by throwing out the hardened damping material. Hope that helps.Rgds</blockquote>