I have 2 12L7 kickers in my boat.One under the driver seat and one in the left compartment.The one under the pass. compartment when turned up rattles the hell out of it when it dropps looow!What should i do
first find out what is rattling then put electrical tape or insulation over it. For insulation you can use windown weather stripping. I had some vents that used to rattle, this worked pretty good and it's out of sight.
Dynamat ultimate or extreme works real well. Its the stuff that is tar like and about 1/4inch thick. You can put that on the inside of the compartment under the carpet. You can find generic online for half the price of the real stuff.