My 2011 ford fusion has pretty sealed up doors. I'm wondering what options I have to kill backwave reverberations. I tapped on my speaker just now with the door cards off and it sounds like a racket ball Court. Really tinny, kind of an echo. Heres a pic. I was to stupid to take my own so I screen shotted this of a youtube video. My problem is I can't get my arm in there even enough to Clean let alone trying to use cld inside there. The whole aluminum panel is riveted to the door so the only way is is to drill it and add new rivots or nuts and bolts. I'm worried if I open it I'll screw something up with my window motor.
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