I just upgraded the door speakers in my car. The pro audio company recommends using something like these panels to tone down the inside of the doors and the back of the door panels. The product they recommended was almost three times the price of this product, but they nailed it and left me enough to handle the backdoors as well. Now it's like driving a much more expensive car and the stereo sounds better. They stick very well and are easy to cut, but beware of sharp edges!
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