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Sound Proofing a Car

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onedesigntalk

Joined: Oct 21 2010
Posts: 2


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Post Thu Oct 21, 2010 12:53 pm

The noise from the road rushing beneath our vehicles can prove annoying. It can interfere with the quality of the sound coming from car stereo systems and make it more difficult to hear conversations among passengers. To help insulate the passenger compartment from outside noise, Dynamat sound-deadening sheets can be installed.


1.1
Park the vehicle on a level surface. Apply the parking brake and open all doors. Put on your safety glasses. Remove the vehicle's door sill plates by removing the mounting screws with your screwdriver and set them aside.

2.2
Remove the seats. Loosen the mounting bolts of the front seat with a wrench. (The mounting bolts can be located in the passenger compartment on the seat sliders or under the vehicle coming up through the floor pan and into the seat sliders.) If they are accessible under the vehicle, there is no need to raise the vehicle--they can be accessed by reaching under the vehicle approximately 6 to 8 inches. Once the bolts are removed, set the seats aside on the floor. To remove the rear seat, simply push the seat bottom down and at the same time push it toward the trunk (to the rear). When you feel it pop free of the mount, lift the seat up and out of position. Set the seat outside of the vehicle on the floor.

3.3
Remove the seat belts and carpeting. Use a wrench to loosen the mounting bolts and set the seat belts aside. Mark each belt with a piece of masking tape and a pen to ensure it goes into the correct location when reinstalled. Remove the carpeting by simply starting at the front and pulling it toward the rear. It is not glued down and will slide out. Set it aside on a clean floor.

4.4
Clean the floor of the car. Vacuum the entire floor and use a hose to wash it down. Allow it to dry completely before proceeding.

5.5
Peel the protective covering off of the back of the Dynamat to expose the adhesive and apply it to the vehicle's floor. Take care to work slowly so as to eliminate air bubbles. You can trim the Dynamat to size or cut it to shape with a pair of large tin snips. Be sure to cover the entire floor and push it down evenly to smooth it out. If you get any air bubbles, use a razor blade knife to slit the bubble and push the air out with the fiberglass installation tool. Use the razor blade knife to cut around all bolt holes in the floorboards.

6.6
Replace the carpet. Slide the carpeting into position and make sure it is straight.

7.7
Replace the seat belts into their proper position and replace the bolts. Tighten the bolts with a wrench.

8.8
Replace the seats. Replace the rear seat first by sliding it into position and push it down as you push it into place. When you feel it snap into the track, allow it to slide forward and into the locked position. Replace the front seat by setting the seat into position and replacing the mounting bolts. Tighten the bolts with a wrench.

9.9
Replace the door sill plates by setting them into position and replacing the mounting screws. Tighten the screws with a screwdriver. Close the doors.


There are some large and detailed images of this here: http://dynamat-complete-installation.blogspot.com/
Tdawgthegreatest

Joined: Jul 22 2007
Posts: 5093
Location: Florence, Oregon


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Post Thu Oct 21, 2010 1:13 pm

Meh, Dynamat is good. But your also just paying for a name.

I'd recommend Second Skin, for all sound deadening materials.

http://www.secondskinaudio.com/
kramer13
Oznium Employee

Joined: Jun 20 2004
Posts: 3744
Location: Baltimore, MD


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Post Thu Oct 21, 2010 4:04 pm

This is an advertisement.
PwrRngr

Joined: Jul 19 2007
Posts: 4407


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Post Thu Oct 21, 2010 4:31 pm

Or you can strip everything out because that **** is HEAVY and slows down your car.
bad venge

Joined: Jul 28 2007
Posts: 3550


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Post Thu Oct 21, 2010 4:55 pm

hell I had mine truck bedliner sprayed in my entire interior ... FAR better then the $800 I spent on Dynamat
Phil
Owner, Oznium.com

Joined: Feb 11 2003
Posts: 7719


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Post Thu Oct 21, 2010 5:25 pm

To dampen road noise, which is high frequency, you should use a thick closed cell foam. Like those cheap camping mats.

For stereo system improvement, and subwoofers, which are low frequency, you'll want to use a heavy tar based material.

To do it right, remove *every* panel, coat everything with a few layers of the thick low-freq dampening, then coat that with a layer of high-freq closed cell foam,

Enjoy
mntndewboy69

Joined: Oct 23 2008
Posts: 966
Location: Camp Hill, PA


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Post Thu Oct 21, 2010 9:35 pm

I had Dynomat put in when I had my sound system installed. With the radio turned up to near deafening levels inside, it's a faint thump when you're standing right outside it.

The rattling license plate gives it away though, icon_rolleyes.gif , I've tried everything to lock that **** down but it will not be quiet. Most recent idea I had was to just take the whole plate off, but I don't think the 5-0 would approve of that much, lol.
Tat2Dragons

Joined: Jan 21 2007
Posts: 3404
Location: Baltimore Maryland


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Post Thu Oct 21, 2010 11:29 pm

kramer13 wrote:
This is an advertisement.
It sure looks that way. icon_wink.gif
Tdawgthegreatest

Joined: Jul 22 2007
Posts: 5093
Location: Florence, Oregon


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Post Fri Oct 22, 2010 12:02 am

mntndewboy69 wrote:
I had Dynomat put in when I had my sound system installed. With the radio turned up to near deafening levels inside, it's a faint thump when you're standing right outside it.

The rattling license plate gives it away though, icon_rolleyes.gif , I've tried everything to lock that **** down but it will not be quiet. Most recent idea I had was to just take the whole plate off, but I don't think the 5-0 would approve of that much, lol.


Rubber Spacers? Thats what I did on my mustang.
Tat2Dragons

Joined: Jan 21 2007
Posts: 3404
Location: Baltimore Maryland


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Post Fri Oct 22, 2010 12:42 am

Tdawgthegreatest wrote:
mntndewboy69 wrote:
I had Dynomat put in when I had my sound system installed. With the radio turned up to near deafening levels inside, it's a faint thump when you're standing right outside it.

The rattling license plate gives it away though, icon_rolleyes.gif , I've tried everything to lock that **** down but it will not be quiet. Most recent idea I had was to just take the whole plate off, but I don't think the 5-0 would approve of that much, lol.


Rubber Spacers? Thats what I did on my mustang.
^^Yeah that's usually a good fix. Also, if your plate only has two screws holding it in place, I'd recommend adding two more to the missing holes. Then place rubber spacers under/behind all four of them.
bad venge

Joined: Jul 28 2007
Posts: 3550


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Post Fri Oct 22, 2010 3:10 am

I took 1/4" plate aluminum and a layer of Dynamat and sandwiched that to my plate then rubber feet on all screw holes then tightened that up.
Last sound competition the guy said you can start anytime , I said look at the meter it was 150's and hardly could hear it outside of the car ... icon_lol.gif
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