The rest of the metal can sympathetic resonate.
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On our ancient 1991.5 Dodge Cummins 4x4, we pulled all the panels out of the cab.
We installed acoustic adhesive-backed insulation on every accessible cubic inch, including inside the doors.
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World of difference:
* radio at '19' instead of '56'
* conversations without hollaring
* arriving fresh without ears ringing.
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And we could hear squeaks and rattles, so we knew if something was on its way to falling off.
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