Vehicle Sound Deadening & Sound Proofing Basics

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Making a vehicle quiet

When making a vehicle quieter you have three fundamental ways of stopping the unwanted noise reaching the cabin and your ears:
Silent Coat 2mm Deadening Mat
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Silent Coat 2mm Deadening Mat

1 – Stop Vibration

Noise from the vehicles engine, tyres and general road noise can make the metal panels vibrate.These vibrations are amplified by the resonating panels essentially turning your vehicle into a giant speaker. By applying a sound deadening mat to the metalwork the vibrations will be damped and the vehicle will seem instantly quieter.
Silent Coat Absorber15 Acoustic Foam
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Silent Coat Absorber15 Acoustic Foam

2 – Absorb Sound

Once you have killed the vibrations you need to deal with the airborne noise that is still coming through the doors and floor etc.  It is only practical in a vehicle to absorb the higher frequencies therefore a range of foam products are available to apply on top of your damping mats and to fill hollow voids eg roof void etc.  
Dodo Pro Barrier MLV Mat
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Dodo Pro Barrier MLV Mat

3 – Block Noise

Low frequency road and exhaust noise cannot effectively be completely absorbed in a vehicle as the thickness of foam required would be impractical. It is therefore required to block the incoming noise with an effective barrier. The best solution in a vehicle is to use a heavy vinyl layer (MLV).

Ideally this should also be isolated from the panels using a foam decoupling layer. 
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Conclusion

The ultimate solution for a vehicle is therefore to reduce panel vibrations with sound deadening mat, add a layer of foam absorber and finally a layer of mass loaded vinyl to block the sound.

Obviously all these layers may not be practical for all users and installations, however with these rules in mind you should be able to plan the best solution for your needs.
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