I have 2 JL 12W1's in my trunk and it rattles. I know that that is to be expected but has anyone found a quick fix to reduce the rattling without dynomatting?

in mt car it was the plastic of the brake light housing that rattled against the glass. get some padding and stuff it under there throuth the bottom of the deck lid in the trunk

just aim the nozzle into a crevice with the offending rattle or resonance and shoot a small amount of the insulation into it. a little bit will go a long way. trim any excess with a sharp razor blade and you're set.

this works really well inside doors and under package tray covers.

HTH