Stop Ratteling in 99 convt. trunk

[99v6convt]

Ok so i found a ported dual 10" box to fit in my trunk finally. But whenever i even begin to turn it up i get a loud ratteling sound coming from the "wall" between the place where the top fits and the trunk. It doesnt fell like any kind of wall that i could dynomat.Does anyone know where i can tighten it down or support it. Thanks

 

[ChingonStang]

That's the price your gonna have to pay for big bass enclosed in a small area. Which way is the port facing? The force of the air might be pushing the plastic wall separating the trunk.