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Thanks a mil for this, it really cleared things up for me.

a new addition to my fleet at SMD HQ. Its a Roland True VIS VG2-540. The media is 54”, tg entire machine is 105.5” wide! It takes 8 colors so you know it's gonna look good Real stickers, (we already have a vinyl sticker cutter but this prints and cuts hence the word “real” ). Banners, posters, t-shirt (heat press) and a bunch of other uses. It arrived today and tomorrow we set it up and get rolling! check out a few unboxing pics here in the meantime.

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.