Where would you apply the sound Damplifier. On the inter metal skin or behind that. If behind how do you reach that area. If you have to break off the white plastic how do you replace it. Also if it worth replacing the speakers when you have that panel off. I have a limited with the JBL package and i would love to try to increase the bass notes. Wondering if it would be worth it to replace the door speakers.You'll likely find spray-on sound deadener on the inside of the outer door skin that's similar to what you see in the spare tire well, I plan on adding 2mm Damplifier Pro to the front doors and under the front carpet. Thanks for the tutorial!