Doors: 60% coverage of CLD on the outer skin and 25% coverage of CLD on the inner skin spread out in a checkerboard fashion will provide great results.
We have B Stock boxes that are in the range you are looking and some even ship free. Check them out here https://store.secondskinaudio.com/specials-sale/
Other boxes are also available on the SSA website https://store.soundsolutionsaudio.com/deadener/second-skin-audio.html
You can email us at service@secondskinaudio.com or call 1-800-679-8511 anytime Mon-Fri 9 am to 4 pm AZ time and we will answer any questions you may have.
Team Second Skin