Doors are, just like the bottom plate, parts of the vehicle that can potentially block a lot of noise. After all, doors form a big part of the total surface of the vehicle and are made from relatively thin sheet metal.

Showcase Hummer H1 Part 5: Sound Insulation and Anti-drumming

Doors are, just like the bottom plate, parts of the vehicle that can potentially block a lot of noise. After all, doors form a big part of the total surface of the vehicle and are made from relatively thin sheet metal. Because of the thin sheet metal, the car door quickly starts to vibrate causing noise nuisance. In part 5 of our showcase we dealt with this issue concerning the Hummer H1.

There are three methods of sound insulation when it comes to car doors

Basic

This method effectively counters the most frequently occurring type of noise nuisance and consists of covering the inside of the outer plate of the door. The outer plate should be covered for about 80% of Vibraflex Normal or STP Black Silver sound insulating anti-drumming plates. You can apply this method for insulating slight resonance coming from the bodywork and airborne noise that you hear whilst driving.

Medium

This is method 1 (basic) plus an extra step. You apply the same materials on the same spots as during the first method, but with the additional step of also covering the metal interior panel of the door with Vibraflex Normal or STP Black Silver. Tip: pay attention to the amount of extra weight you add to the door.

Extreme

Optimal sound insulation for perfect audio reproduction. In this case, the goal is not to counter noise nuisance, but to make most out of the car audio system. The door should almost entirely be covered with Vibraflex Extreme or STP Aero Bomb. Heavy, sturdy doors will vibrate less, allowing the music to sound a lot better. This is a must have for participants of car audio contests.

In this part of the Hummer H1 showcase the second method is applied. This method is characterized by a good price-performance ratio and the solution is easy to apply by yourself.

Optimising the sound of your audio system

As an addition to the described methods, you can equip the door with the sound absorbing plate Akotherm (25 mm thick) in order to improve the sound quality of your car audio system. You place the Akotherm plate on top of the layer of Vibraflex or StP products. This absorption plate ensures your car door won’t function like a sound box and prevents a hollow echo, both in case of professional or standard loudspeakers.

Tips for processing

  • Pay attention to the thickness of certain materials and the space they need, making sure the window can still be opened and closed.

  • Do not cover spots of the body that you will need access to later on in case of maintenance, such as electric window control.

  • Thoroughly degrease and cleanse all surfaces before you get started!

More information about vehicle insulation

On our page with solutions regarding vehicle insulation you will find the most common problem areas. Additional tips pages about various types of vehicles you will find here:

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