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From my understanding you either run a trunk setup sealed fired into cabin or not sealed fired backwards (trunk lid) for optimal SPL. I would favor sealed fired into cabin since it lessens the rattles but that's just me. As far as your question about stacking specific types of sound deadener you might get some insight from @Second Skin they know their stuff.

Yes you are on the right track about sealing that trunk tight to force the waves forward and also not wanting back waves to cancel out the front waves. Multiple layers of a good butyl deadener are rarely needed unless you are pushing major dB like 150+ To completely seal the trunk and block out all outside interference noise, you will need to apply Damplifier/Damplifier Pro on the metal everywhere (normal cars can get away with 40-60% coverage but large SPL builds should use Damplifier Pro in 100% coverage throughout the trunk). That will make the metal more solid. Then add Luxury Liner Pro (CCF+MLV) with the foam side attached to the Damplifier Pro the Mass Loaded Vinyl is what will block out the outside noise and also give your trunk a clean and even surface to reflect waves off of. With Damplifier Pro and Luxury Liner Pro completely covering the trunk area your sound pressure will not escape out of the trunk and will move forward into the cabin. If you treat the back seat wall you will be blocking sound waves from getting in the cabin so don't use MLV on the back seat. We can be reached at 1-800-679-8511 9 am to 4 pm Mon-Fri for any further questions. #SMDFTW #TeamSecondSkin @Joshdashef thanks for tagging us, it really helps us find the threads. We appreciate your support.