u/Kalakukko34

Hello, what’s yall thoughs about this plan: Im treating my doors to make midbass sound better (Hertz HV 6,5”). So there will be 1 layer of butyl mat on the outer door panel + layer of sound deadening mat.

Now comes the problematic part: On the inner panel there will be a 1 layer of butyl mat, BUT what do i do to the SERVICE HOLE, that has the gray ”vapour barrier / acces hole” on the right? Do I just seal it and cover it with butyl mat? Will that be enough or do i need to use something solid to block it?

Any help is welcomed!