NVX SDDK12 12 Sqft Sound Damping (Sound Deadening) 4-Door Kit

NVX SDDK12 - 90mil 2.3mm THICK

4-Door Kit - 12 Square Feet of Sound Damping (Sound Deadening) Material (Four 12" x 36" Pieces)

4-Door Kit - 12 Square Feet of Sound Damping (Sound Deadening) Material (Four 12" x 36" Pieces)

• Eliminates Road Noise
• 2.3mm (90.55mil) thick for better performance
• Quiets Vibrations
• Stops Rattles
• Increases SPL
• Reduces Heat
• Simple To Install
• Easy To Form Aluminum
• Four Step Peel and Stick Installation
• Four 12" x 36" Pieces


List price $69.99
Save: $30.00


In Stock with warranty
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Order within 20 hrs 36 mins to ship 6/15

FREE delivery: Thu, June 17 to VA.

Item Condition: Brand new

The item is brand new and not used.

60-Day Money-Back

Hassle Free Returns

365-Day Coverage

Warranty assistance for a year


Authorized dealer

Benefits of Sound Damping

Sound dampening material is key to reducing the rattles and shakes in your car. It effectively reduces the amount of road noise that is let in through the thin panels of your vehicle. It also lessens vibrations that are created by playing music through your speakers. It works by adding weight to the desired panel, which lowers the resonating frequency. You will notice by adding this material to your car, your sound system will likely get noticeably louder. If you have subwoofers, this is the perfect kit for your vehicle.

Thicker Than the Competition

NVX is one of the world's leading manufacturers of sound dampening material, and is up to 30% thicker than the other brands. Don't pay ridiculous amounts of money to kill those rattles, when you can get everything you need from NVX for a fraction of the price. With the SDDK12 dampening material, you will notice a higher quality sound from your system as well as a drastic reduction of road noise. With 12 square feet of material, you will have enough to cover all of those problem areas that have been bothering you for so long!

  Best Value!



Dynamat 10612 



Dynamat 10612

Stinger RKXDK

Ballistic SSDK






Total Sq. Ft.

12 Sq. Ft. 12 Sq. Ft. 12 Sq. Ft.  12 Sq. Ft. 

Total Thickness

2.3mm 1.19mm  2.0mm  2.1mm


100% Butyl Rubber & 
Aluminum Foil
Butyl Rubber & 
Aluminum Foil
 Butyl Rubber & 
Aluminum Foil
 Butyl Rubber & 
Aluminum Foil

Self-Adhesive Back


Four Sheets:
12" x 36"

Three Sheets:
18" x 32"

Six Sheets:
12" x 24"

Four Sheets:
12" x 36"

Product Features

  • Four 12" x 36" Pieces of Sound Dampening Material
    • 90.55mil thick (2.3mm)! There are cheaper, inferior solutions at 50-80mil, but we do not recommend that thin of a solution as it will not perform as well.
  • 12 Square feet total
  • Made from 100% Butyl Rubber
  • Eliminates road noise
  • Quiets vibrations
  • Increases sound quality and output of car audio system
  • Stops rattles
  • Increases SPL
  • Reduces heat
  • Easy to form aluminum conforms to desired area of vehicle with ease
  • Four step peel and stick design for easy installation
  • Up to 30% thicker than the leading competitors
  • Dimensions (each piece): 12"L x 36"W
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

How to Install Sound Damping Properly

Sound damping can be a very beneficial accessory to reduce noise and vibration. To take full advantage of this soundproofing, read these instructions carefully and follow them till the end. It’s important to familiarize yourself with all the details to install the sound damping correctly. Incorrect installation will result in less than desirable results.

Step #1

The first step is to decide which location in your car you want to insulate. These locations include the floorboards, roof, door panels, trunk or firewall. We recommend soundproofing all metal surfaces for maximum sound deadening performance. Next, refer to your vehicle’s service manual for information on how to dismantle the trimming panels. Be careful when removing the panels to avoid breaking the fixing clips.

Step #2

Once the trimming is dismantled, remove the remainder of the factory insulation if it is damaged. If it is still intact, there is no need to permanently remove it. Next, you need to properly clean, dry and degrease the prospective surface. Sound deadening won't adhere properly if applied to a wet or dirty surface. Use a metal surface cleaner or degreaser along with a dry, clean rag. Make sure to use gloves and apply the degreaser in a well-ventilated space.

Step #3

For this step, measure the prospective surface you are going to treat. To make things easier, make a template of the appropriate size on a large sheet of paper and then transfer it to the damping material. That will make it easier to install it more accurately and avoid wasting material. Use a utility knife to cut the desired shape and size. Be careful and use gloves to protect your hands.

Step #4

Place a sheet of sound damping to the surface without removing the protective film. If it covers the surface properly, you are ready to install it. Gradually remove the protective paper film as you apply it to the surface for better adhesion. Once on the surface, press it down firmly until it is set in place. Flatten it with your hands to avoid unnecessary air bubbles. Use a rolling tool like the NVX SDRLR1 to press the mat down to the metal surface. Go across the entire surface with the roller to ensure that the sheet is installed properly.

Step #5

Once all sound deadening is in place, simply reinstall all trim pieces and carpet back to its original placement. Now you are ready to enjoy higher sound quality with fewer vibrations.

This item is currently not eligible for our low price guarantee. This may be due to supply constraints, manufacturer restrictions, or another reason. We're always here to help you get the best price possible so give us a call or email today. Our experts will do their best to build the system that works for you within the rules.

Sound Damping Specifications
Installation Location
Material Thickness
Total Amount of Material
12 square feet
Material Use
Vibration Dampener
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
  • NVX Audio Sound Dampening | Test & Installation Demo
  • How To Install Sound Damping in a Car | NVX Audio & Mitsubishi Evo 9
NVX SDDK12 - 90mil 2.3mm THICK

NVX SDDK12 - 90mil 2.3mm THICK



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Overall rating distribution

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By feature average rating



January 19, 2014

A lot of materual

Ordered this for my F Super Cab. I just wanted some material to apply to the inside of the door skins. It is a lot more material than I needed. Ford already has a small amount of sound dampening material. It did quiet the interior as expected. Great product. Came with no instructions. I just used some alcohol to clean the surface first.


found this helpful.


February 18, 2014

love it!!!

Love this product. Great price and easy to work with.


found this helpful.


June 10, 2012

Decent Dampening

I have had this for almost three months on my trunk lid and it has made a big difference. The rattling is not as bad as it used to be and it made a difference inside the car.

DON'T buy this if you live in arizona because the heat is too much for it.


found this helpful.


June 11, 2014


Excellent sound deadener for the money, very thick, no smell once applied, super tacky and sticks even to dirty surfaces. Applied in my doors it made a big difference inside the car, applied in the trunk the bass sounds much better inside but it didn't stop my trunk from flexing and sounding like it's about to explode. All in all excellent product and would definitely recommend!


found this helpful.


September 17, 2013

Good product

Easy to work with and in my opinion it performs better than dynamat!


found this helpful.


August 16, 2013


put on my trunk to stop rattles. worked great, doesnt sound like a tin can from outside. thick stuff definitely a good deal. as good, if not better, as the bigger sound deadener brands but at a lower price. i highly recomend


found this helpful.


April 21, 2013

Great for Rattles

Installed this stuff in my front doors and enough for the speaker area in the rear doors. It only slightly reduced the road noise in my car, but tightened up the bass and reduce rattles by a huge degree. This stuff is easy to install and can often be bought on sale.


found this helpful.


January 6, 2014

Impressive product

This is a very stout, impressive product. It feels thicker than the famous competition and there is no smell to it. The sheets you get are sort of a long/narrow size, so they are great for running vertically up the doors and on the outer door skin. You'll definitely want a source of heat when working with these and really, there isn't a better value for the kind of product you are getting here.


found this helpful.


October 6, 2013

Seems fine

Used on rear door skins. No smell, easy to manipulate.


found this helpful.

Trent Streichert

September 5, 2013

NVX 12ft.

This is great material for a great price. Ive bought multiple nvx dampening products and have been pleased with everyone. This this easily applied with a nix roller and contains the perfect amount plus some to use on your doors.


found this helpful.


June 14, 2012


As good if not better than others, and I saved $$$. Easy to use. Easier to press to surfaces than the stinger.


found this helpful.


February 9, 2015

Awesome Stuff

I installed four 6x9 speakers in my car recently and noticed that the doors and trunk were rattling. I was recommended this sound damping for my car. I found it very easy to install and it made a huge difference. I noticed a huge change from not only on the inside but on the outside of my car. I would recommend using this stuff if you have aftermarket speakers in your car. GREAT BUY!


found this helpful.

Donnie E.

March 26, 2013

Fantastic kit

This kit is almost half the cost of competitors and works just as good or better.


found this helpful.


September 25, 2013

Hands Down

Hands down!!! this is good stuff for anyone, who would like to enjoy maximum output and clarity. NVX greatly enhances the timbre and the acoustic of your audio speakers,you cannot wrong with this


found this helpful.


September 14, 2012

NVX Sound Dampening Material

This was very easy to work with. It seems to be as good as any of the more well know and more expensive brands. Sound dampening at least the doors is necessary to seriously improve the quality of sound in your vehicle.


found this helpful.

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4-Door Kit - 12 Square Feet of Sound Damping (Sound Deadening) Material (Four 12" x 36" Pieces)


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