To further reduce the cabin noise and to increase the quality of the speakers, we’ve gone ahead and purchased 2mm mass loaded vinyl, which we super glued to 3mm closed cell foam. The MLV acts as a sound absorber while the CCF absorbs the high frequencies, acts as a bit of an insulator and a decoupling layer stopping the MLV from rattling inside the door trim. We got a few hole punches from a local hardware store and shaped the parts to fit. The door panels had a few new holes drilled to allow for new nut inserts to help hold the heavy MLV/CCF combo. It took us a week to get both doors trims to fit properly. It was a pain! On top of that we ran new wiring inside the door speaker with a 12 gauge speaker wire through the door rubber boot. This was a frustratingly labour intensive one. The speaker was finished off and baffled front and back with a Speaker Acoustic Kit Seal from InstalPro.
