If you have a small car subwoofer installed into your trunk, then the rattle will not be noticeable as the cone movement will not be so impactful. However, if you are running multiple 1000 watt rms subwoofers in your car at high volume levels you are certainly going to experience annoying trunk rattle. This can make your thousand dollar car audio system sound like trash from the outside just like a ricer. This is what most real car enthusiasts want to avoid because not only does it impact the sound quality but it makes a rattle sound each time the low deep bass occurs, this can sound really silly around frequencies around 25 to 30 HZ. Trunk rattle happens because the vibration created from the subwoofer create air molecules that transfer into energy that get delivered onto all the metal panels that are trunk related. Too many of these that be created from large subwoofers result in loud rattling. The best way to stop subwoofer vibration noise is to add a sound deadening material that acts as an absorber to any apparent rattles your ears can pick up.
When most people install a car audio system, they always seem to skip the importace of reducing the rattles created from a subwoofer at loud volume levels. There are many good makes such as dynamat or silent coat that provide high quality dampening to apply to your inside of your vehicle. What most people do is apply it just inside the trunk, but if you want a sound proof system you can remove all the carpets from the trunk and front / rear interior and place it literally everywhere. Now if you are wondering what is the best cheap way to fix trunk rattle without using dynamat some people have used the back of egg boxes from Walmart or Bestbuy. Na thats meant to be a joke, sorry if you are going to go cheap the forget about reducing vibrations in your trunk since sound deadening material can get quite expensive depending on how crazy you want to go.
These are the best suited instructions for most newbies in the car audio industry that will help you with applying sound deadening material to the inside of your cars trunk that we have come up with. This will also help stop rear view mirror vibrations as well if done properly with thick layers covering all the exposed metal you can literally see.
1) Turn off the cars ignition. Remove the subwoofer enclosure, by removing the speaker wires from the terminal cup and if you need to remove the amp from the car then do so. This is required because you will need to access the different compartments and areas found inside the boot.
2) Right ok so basically you will need to access all the metal panels in the trunk. In order for you to do this, you will require to remove all the carpets from the interior. You will then need to remove the spare tyre as well, place it to one side inside your garage.
3) Now you are ready to apply sound deadening material to your car to stop vibrations thats great. Cut it into shape using a blade or a pair of scissors, peel the material into two halfs with the sticky glue size facing down, place it flat onto the metal and go over it with your palm of your hand to smooth it down.
4) To ensure that it sticks properly onto the metal in the cars trunk that causes the rattles, use a roller that comes usually supplied with the kit and go over it up and downwards until the bumps are gone. If you don't have this you can use something like a old wallpaper roller if you have one laying around your DIY shed. Now you know the procedure all you need to do is apply this same sound deadening instructions for all the other metal parts found inside your cars trunk.
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