Need help!! Anything....Sub keeps vibrating when doors and especially trunk are closed

[Purpzilla]

So I’m at a loss I was in a wreck and totaled my old car that had the sub in it no damage that i can tell to the sub or amp but I got a 2018 Honda Civic hatchback which required a line out converter for my rca cables. Well after installing everything I’m only getting little volume from the bass when it is actually working how it should but when it isn’t it shaking violently! I have no idea what else to do please help!!!!

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[JohnKuthe]

Damplifier sound deadening stick-on to keep the metal panels from vibrating.

I have a bunch in my 2006 Grand Caravan, and it works wonderfully.

John Kuthe...