• Identify any trouble spots where there are lots of annoying vibrations. Speaker grilles tend to resonate and buzz, road and engine noise can come through the firewall and floor, and a door panel missing a rivet can vibrate noisily.
• Just using an inexpensive door kit can make your speakers sound better by damping the resonance around the speaker area.
• If your vehicle has a lot of ambient noise, applying a vibration damper can give you a quieter, more relaxing ride.

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http://www.crutchfieldadvisor.com/S-wuRVKYrFeJI/learningcenter/car/vibration.html