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Sound deadening is a useful way in keeping trunk rattles, along with other vibrations, at the very least. Deadening your vehicle will not guarantee you that the car will not have a single rattle. If done properly, rattles would be kept at the very minimum level. Choosing the amount that you need is completely up to you, but I would recommend going over your whole vehicle twice. Basically, I mean that deadening your vehicle twice will improve the chances of having no rattles by a great extent. Road noise can greatly reduce if the deadening was done correctly. Also, the type of product will aid you in which to choose from. Not all sound deadening products will reduce road noise. In fact, many of these products are strictly intended for car audio applications.
Dynamat Extreme, FatMat, Raamat, and Second Skin are just the few of many manufacturers that deaden the vehicle. After researching these manufacturers, I've found out that Second Skin works best under extreme conditions. So if you live in a hot climate, where the temperature is consistently high, you might want to consider Second Skin as your sound deadener. This costly product works in conditions such as extremely cold weather, extremely hot weather, sound systems containing over 10,000 RMS, and resistance towards road noise. While Second Skin is the most costly deadener out of the other three I've mentioned, it has proven to work the best under extreme loads. It is up to you to decide if Second Skin is worth the money in your particular setup. In my opinion, if your running over 2500 RMS, I suggest you go with Second Skin Damplfier Pro. Don't get me wrong, the other sound deadeners are great for the price, but it may be worthless in extreme situations. If your setup is under 2500 RMS, I would assume that the other sound deadeners would get the job done, but it's only an assumption. Also, you need to account for the amount of deadening needed to complete the entire vehicle. Obviously, a truck or SUV will take alot more deadening than a hatchback, such as a Mazda 3Speed. Deadening a vehicle requires time and effort, especially if you aren't familiar with tearing up a vehicle to the sheet metal. Doing a half-ass job on deadening your vehicle will only yield in disappointment when you find out there are still major rattles throughout the vehicle.
I deadened my vehicle with the help of a buddy of mine using Second Skin. Successfully, the car was rid of rattles, squeaks, and road noise. I was surprised to find out the difference in sound quality. Because all the rattles and squeaks have been taken out, I've heard a gain in sound quality throughout the entire vehicle. With that said, sound deadening your vehicle will improve the sound quality of your overall setup. I would highly suggest sound deadening if you are primarily looking for crisp and clarity in your music. There are different packages to look for when choosing your sound deadener. Most manufacturers have them in trunk packages, door packages, bulk packages, and other specific parts of the vehicle. This is useful because if you intend on deadening a certain part of your vehicle, you can choose one of the selective packages rather than the bulk, which is far more expensiver.
The main purpose in deadening your vehicle is get the clear and crisp bass out of your drivers. Second Skin has other products that could increase the chances of having a quiet ride. To deaden your car properly, you need to gather the appropiate tools. To begin the installation, remove the dashboard, door panels, carpet, and seats. Make sure you have a scalpel, glue, hair dryer, roller, acetone, and many rags. Also, make sure the sound deaden material is warm. If not, keep it out in the sun to warm up. By keeping the material warm, it will become more pliable and easier to apply. The acetone is required to clean the surface of the metal floor, firewall, doors, along with the trunk. A good idea is to spray glue on the metal surface before you apply the sound deaden material. Peel off the backing from the deadening material and firmly apply it to the metal surface. This is where the roller comes into play. Also, a hair dryer could be an advantage so you could heat up the material while it is being applied. Make sure all the bubbles, gaps, and bumps have been rolled out. If not, take the roller again and press down on the material to smooth out any gaps.
After deadening the entire vehicle or the specific part that you intended on being deadened, replace the dashboard pieces along with the door panels, carpets, and seats. Just a FYI, sound deadening can reduce road noise of up to 6dB. The term, dB, stands for decibels. It is a measure of how loud a sound system is. In fact, it is a measure of how loud anything is. In competitions, the way we indicate who is louder is by using a term-lab software with a microphone. You place the microphone usually beneath the gas pedal or at the headrest (depending on which class your competing in). The higher the SPL, the higher the dB. With all the efficient technology we have in today's world, sound systems have become increasingly louder than before. With that mentioned, it shows that the technology we use in today's world has aided us in reaching a higher SPL level. To clarify the meaning of dB, we can state that every 3 dB is twice as loud to the human ear. For instance, if i hit 142dB my first run with my current setup and reached a 148dB with a few tweaking skills, then the current system is three times as loud as it was when it hit 142dB. To find out more information about db, click here
Here's a few pictures of my install