jdunk54nl

For sound deadening needs
https://resonixsoundsolutions.com/

HushCarAudio

I also carry Second Skin Audio sound dampening products which is in stock, cheaper, and in my opinion better. For example most CLD tiles are half the mass and more expensive compared to Second Skin's Damplifier Pro. Overkill Pro is nearly 10mm as a decoupler and nearly twice the mass compared to ResoNix FD1 at nearly the same price.

jdunk54nl

In reality all we need is some CLD and MLV. The foam isn't necessary. Also the thicker/heavier the material isn't better for a decoupler. We need it to be able to compress but fill the voids. The best would be pillow stuffing. That is why the resonix material is trying to be lightweight to where it can compress but not be too stiff. Whether the resonix fd1 is better or worse than overkill is definitely debatable. I have no clue to that answer, but I do know they were trying their best to mimic pillow stuffing in an easier to use solution.
https://www.dropbox.com/s/5yd1s6vbxb...0v1.3.pdf?dl=0

https://www.diymobileaudio.com/forum...ded-vinyl.html

HushCarAudio

I didn't see that site list any MLV. Second Skin sells it under the name Luxury Liner. The pro version has both the decoupler material and MLV already attached to it. With regards to mass being a determining factor for sound deadening, I guess we will have to agree to disagree on this point. I feel more mass will always be better than less mass when trying to absorb, block, or neutralize sound waves.

jdunk54nl

He doesn't sell MLV because it is the same stuff you can get on amazon for cheaper if he did, so why charge people more was his reasoning.

I agree that the MLV or lead sheet mass is important, but foam doesn't stop acoustical sound waves or isn't very effective no matter the mass. The only point of the foam is to decouple the MLV from the door and allow the MLV to "float" in the door. Which was the thought prior to Justin Zazzi's experiment which more or less proves that using foam to do this isn't effective for the cost of the foam. You are basically wasting your money buying the foam unless the MLV, in a miraculous way, actually causes vibrational noise, which would be really impressive if it did.


Even with all of that said, I still spent $250 on foam knowing that it only provides very minimal improvement and wasn't really worth that cost.....

jdunk54nl

Also one last note, unless you are planning on doing 100% coverage of the entire vehicle (doors, floor, back wall) in MLV, the cost of entry isn't worth it and you might as well just do CLD. You basically need to make a bathtub out of MLV in your car to be worth it.

HushCarAudio

That's a cute report and test setup but real world proves differently. I did my own real world test using a car, driving and at idle, using a decibel meter. I reported the results years ago and recently Second Skin told me they would post it for their new website.

"The guys at Second Skin Audio make great stuff and here is some test data that I've compiled. On this test, we used our clients 2015 Mitsubishi Lancer Evolution. This car was bone stock and had terrible road and tire noise. The client had asked us to see what we could do to make it more quiet so he could carry a comfortable conversation using bluetooth on the phone while driving. We used a decibel meter at the drivers head height for each test and used the same rode to test everything for consistency. Here are the peak numbers for each test.


82.1 db at 80 mph, 77.8 db at 65 mph, 50.5 db at idle - Stock car

78.3 db at 80 mph,71.9 db at 65 mph - Dampened Doors only

77.1 db at 80 mph, 69.1 db at 65 mph - Dampened Doors & trunk only


75.3 db at 80 mph, 66.9 dbat 65 mph, -Dampened Doors, trunk, and floors


The materials used on this build were Damplifier Pro and Luxury Liner Pro. We layered both materials throughout the vehicle with 100% coverage in the doors, trunk, and floors. As you can see from our tests, driving at freeway speeds yielded us 11 db difference from stock after all the treatments were finished on the vehicle. A 1 dB change in a sound equates to about a 26% difference in sound energy (remember that a 3 dB difference is a doubling of energy levels). In terms of subjective loudness, a 1 dB change yields just over a 7% change. A 3 dB change yields a 100% increase in sound energy and just over a 23% increase in loudness. What this all means is that we accomplished his wishes by using the best stuff on earth.


I want to thank you guys for helping us look good. Because of your products, our clients trust our abilities to make their dreams come true. The icing on the cake is when the customer swore we changed his speakers because his stock sound system sounded so much clearer, louder, and better than before the treatments. I've tried many other products and nothing has worked as well as Second Skin products!"

jdunk54nl

That doesn't really say anything about the report I posted. That doesn't have the data for if you were to just use MLV product (Luxury liner) compared to MLV and CCF (luxury liner pro), which is what the report that I posted was trying to show. The report says that the CCF product isn't worth it. So the question that isn't answered there is, Would there have been a difference between just luxury liner (MLV) compared to Luxury liner pro (MLV and CCF)? What you posted just shows either nothing or all in the different areas of the vehicle.

What it does say is that if you damp your doors, that helps but if you are going to go farther, you need to either commit to the entire vehicle or it isn't worth the 1db difference of picking and choosing parts. That I absolutely agree with that data on.

nineball

great points, and you didn't even touch on the fact that they used 100% coverage with the CLD which is just a giant waste of money and time. not surprising since they sell it and bigger sales = more profit. what a shameful vendor.

HushCarAudio

What I posted shows the difference in having only parts of the car vs more parts of the car covered. 100% of the whole car isn't needed to drop noise levels. You'll notice that doing the doors only yielded 4-6 db drop in noise levels. But you are correct in that my data wasn't comparing the use or non use of the decoupler aka Overkill Pro from Second Skin Audio. I used a combination of Damplifier Pro and Luxury Liner Pro for these results.