Imagine you are driving on the expressway and a very noisy truck is right next to you. Noise from the truck is coming at you through your vehicle's door and it's loud. There are three possible ways to stop the noise from reaching your ears.
The first thing you will notice is that the noise from the truck is making the door's sheet metal vibrate - essentially turning it into an unwanted speaker that is right next to you. Apply a vibration damper like CLD Tiles (Damplifier Pro) to stop the vibration. CLD Tiles have been designed to work with minimal panel coverage. That means you will need to do less work and the project will cost you less.
After you have stopped the sheet metal from vibrating you have two possible strategies left to deal with the noise that is still coming through the door. One possibility is to absorb the sound. Unfortunately, absorption isn't practical in a vehicle. The lower the frequency you need to absorb, the thicker the absorber needs to be. Road, engine and exhaust noise are deep (low frequency) sounds. To be effective, you would need an absorbent material between ten and seventy inches thick. And that's never going to happen.
Fortunately, the third option works perfectly in the space we have available. Block the noise. In exactly the same way the barrier wall of a recording room is blocking sound from entering the room next door and driving the neighbours crazy, you can do the same thing, on a much smaller scale, using Closed Cell Foam (Overkill Pro) and Mass Loaded Vinyl (Luxury Liner Pro).
It's really that simple. For years, we've been going about this all wrong - using layer after layer of "sound deadener" and getting poor results. Use the right tool for the job.
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