To the OP. I will keep my opinions to myself about the video. That type of enclosure, pseudo 4th order, is just one type you can use. The time should be spent completely sealing the trunk from the cabin. I spent gobs of cash on deadener and foam and spray foam, and tons of other stuff. You name it, I tried it. The only success I had was to completely seal off the trunk from the cabin. Here is the best part. Gained output. 141.0 to a 144.7 sealed on the dash and tuned to 28Hz. No other changes. I spent a lot of time sealing it properly and the trunk didn't rattle at all. The sheet metal on the roof folded on itself, lol, but no more rattle.
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