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If your trunk liner is moving with 2 12"s on it, it probably is your driving that is the problem.
i have 1 10" in a sealed box and have no movement issues. but I also have a bit of dynamat back there. you might want to give that a try. it solved some rattle issues I was having.
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Defending the reputation of the red-headed step-child of the focus world for far too long. 
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