Is it really that much more benefit to dynamatting inner skin as well as outter skin, or will just outer skin do on most purposes.

I dont get why the inner skin must be dynamatted, don't the sound waves only reflect off the outer skin.

also, should i just place dynamat behind the 6 inch front speaker locations, or buy actual diffuser

Doing both will not only reduce road noise by a shittonne, but, if all the holes are covered to a decent extent with 9mm or 12mm mdf, it does improve bass response of the mids quite decently.

wat do people think about cutting the actual speaker grill in the door?

also wat are the service holes btw?
new to this stuff

Its not road noise you are trying to stop, its resonance, the outer skin needs to be done because it is one flat piece of metal, that is too thin there for it vibrates and resonates.

The inner skin doesnt need so much attention because there are bends ,curves and bracing in the metal which stops it from being some flimsy. For the best result you need to seal the service holes on the inner skin.

i see alot of people just dynamat the inner skin (as in the skin which people drill the speakers onto, if thats right)?

i see alot of people just dynamat the inner skin (as in the skin which people drill the speakers onto, if thats right)?

When the door is shut the inner skin is closest to you, the outskin is the larger piece.

As for your comment i think you might be wrong, it does depends who you've seen do the matting but more people will do the outer and inner skin, and when they do the inner skin they cover it completely therefore you shouldn't be able to see the outerskin that has also been dynamatted.

Just doing the inner skin would be the worse possible way you could mat a vehicle.


Below are images that will explain what i have just written.
http://www.fastfoursforumscarclub.com/temp/images_nov_dec_2010/10.jpg
http://www.fastfoursforumscarclub.com/temp/images_nov_dec_2010/11.jpg
http://www.fastfoursforumscarclub.com/temp/images_nov_dec_2010/19.jpg
http://www.fastfoursforumscarclub.com/temp/images_nov_dec_2010/18.jpg

When the door is shut the inner skin is closest to you, the outskin is the larger piece.

As for your comment i think you might be wrong, it does depends who you've seen do the matting but more people will do the outer and inner skin, and when they do the inner skin they cover it completely therefore you shouldn't be able to see the outerskin that has also been dynamatted.

Just doing the inner skin would be the worse possible way you could mat a vehicle.


Below are images that will explain what i have just written.
http://www.fastfoursforumscarclub.com/temp/images_nov_dec_2010/10.jpg
http://www.fastfoursforumscarclub.com/temp/images_nov_dec_2010/11.jpg
http://www.fastfoursforumscarclub.com/temp/images_nov_dec_2010/19.jpg
http://www.fastfoursforumscarclub.com/temp/images_nov_dec_2010/18.jpg

Thanks for that! Iguess maybe I didn't look close enough. And what are these gap in the metal everyone is talking about. Do you literally just cut the MDF and shove it in.

Thanks for that! Iguess maybe I didn't look close enough. And what are these gap in the metal everyone is talking about. Do you literally just cut the MDF and shove it in.

The gaps in the doors are called "Service Holes" it allows what you would assume is servicing to be undertaken in the doors. The holes are provided to make work like, changing lock rods, removing exterior handles, lubricating window mechs easier.

For ideal performance you want to rid the door of any resonance/vibrations by adding mass to those panels with a proven butyl based deadner eg: Dynamat or Roadkill. Then you want to seal the door so it acts like a large speaker box, now having the holes in the doors dont help so you lay tape over them (duct tape as it ages well) then cut a piece of MDF to size, place that onto the tape and then tape over the MDF. So the MDF is like the meat in a sandwich and the tape is the bread. The tape seals and the MDF adds the reinforcement.

Once again pics to help with the explanation.

http://www.mobileelectronics.com.au/articles/images/SDpic10.jpg
http://www.mobileelectronics.com.au/articles/images/SDpic11.jpg
http://www.mobileelectronics.com.au/articles/images/SDpic12.jpg

Once again pics to help with the explanation.

http://www.mobileelectronics.com.au/articles/images/SDpic10.jpg
http://www.mobileelectronics.com.au/articles/images/SDpic11.jpg
http://www.mobileelectronics.com.au/articles/images/SDpic12.jpg

THanks! I was thinking it would be that, but wasn't totally sure. And I'm assuming all those small holes in the inner skin are covered with duct tape?

THanks! I was thinking it would be that, but wasn't totally sure. And I'm assuming all those small holes in the inner skin are covered with duct tape?

If your matting the whole inner skin like in the other photos then they are covered with matting.

If your matting the whole inner skin like in the other photos then they are covered with matting.

So matting is that paint on sound deadener I'm assuming?

Matting = Sound Deadner mat, so no not paint on. Its cut the size, peel off the backing and stick it directly to the substrate.

Paint on deadner does not have many uses in a car except for wheel wells.

have you cut the speaker grill in your door. make any difference?

Are you asking if i have taken out the stock speaker grille from the door trim and replaced it? If so no. Below is a pic of my interior, note the door trims.
http://img191.imageshack.us/img191/7287/dsc01032en.jpg
By peaandham (http://profile.imageshack.us/user/peaandham) at 2011-08-07

Will it make a difference? barely. For a decent result you would need to make some extremely solid fiberglass pods and angle them more on axis (firing at opposite headrests, like my custom Kick panels).

How ever if you are talking about where the speaker screws into, we call it a speaker baffle, the stock one is plastic and i have cut a new one out of 12+mm MDF and used that to house the speaker. The MDF allows for a more solid baffle that has no chance of succumbing to resonance due to being so dense. The results of that are noticeable if they are sealed correctly to the door metal with decent sealant.

Are you asking if i have taken out the stock speaker grille from the door trim and replaced it? If so no. Below is a pic of my interior, note the door trims.
http://img191.imageshack.us/img191/7287/dsc01032en.jpg
By peaandham (http://profile.imageshack.us/user/peaandham) at 2011-08-07

Will it make a difference? barely. For a decent result you would need to make some extremely solid fiberglass pods and angle them more on axis (firing at opposite headrests, like my custom Kick panels).

How ever if you are talking about where the speaker screws into, we call it a speaker baffle, the stock one is plastic and i have cut a new one out of 12+mm MDF and used that to house the speaker. The MDF allows for a more solid baffle that has no chance of succumbing to resonance due to being so dense. The results of that are noticeable if they are sealed correctly to the door metal with decent sealant.

Yeah, I meant the speaker grill in the door trim, seems quite restricitive, as its not metal and not likely to be transparent.
And yes, I'm awear of the baffles, those Diamante ones I linked to before I hope will do?