Sound dampening..

[BigRAWesty]

Not at all mate. It's why I put it up separately, so people can find it and use the info..
I would also add the foam to the outter door skins, maybe a pita with the stuff on the inner skin. Did you have a look at the link at how 24% coverage with dynamat is optimum? Will save you a bit of cash..

[FNQGU]

Thanks, yes I saw that. After speaking with 04Off though, I decided not to put any foam in the doors, and to up the coverage on the dynamat with the aim of a bit better sound as well. I won't be doing that for any of the area behind the front seats though.

I have lined all the floor from about just behind the front seats forward to the firewall with new foam as well. Unfortunately I must have forgotten to take a pic of that. When I finish off the vehicle to the back, I'll take a few more pics.

Just quietly I am very pleased with the difference now in the sound from my 6" speakers, even though they are relatively crappy ones. Makes me wonder what a good set would be capable of. Maybe another project down the track...

[BigRAWesty]

Thanks, yes I saw that. After speaking with 04Off though, I decided not to put any foam in the doors, and to up the coverage on the dynamat with the aim of a bit better sound as well. I won't be doing that for any of the area behind the front seats though.

I have lined all the floor from about just behind the front seats forward to the firewall with new foam as well. Unfortunately I must have forgotten to take a pic of that. When I finish off the vehicle to the back, I'll take a few more pics.

Just quietly I am very pleased with the difference now in the sound from my 6" speakers, even though they are relatively crappy ones. Makes me wonder what a good set would be capable of. Maybe another project down the track...

Yes I'm still running stock gq fronts and 6x9' in the rear doors and they sound good. Might go some splits I'm the front

[timmay556]

I just picked up 36 square feet of Dynamat to put in my GQ. I'm thinking full cover on driver/pass door then start under the dash and work as far back as I can along the floor pan. After reading this thread I cant wait to hear the results.

[BigRAWesty]

I wouldn't waste it mate.
As linked earlier in the thread the optimum coverage is 24% from memory. Any more and the gain is minimal.
I'd even it out and cover as much as possible.

The dynamat is not the stuff which reduces noise either, all it does is mass loads the panels to stop vibrations..
You need a thicker, dense cover for actual sound reductions.

[timmay556]

Really?

This is what I was thinking of doing from a prev post....

[timmay556]

Here is a snapshot of what I'm doing

[BigRAWesty]

Ok you have 2 different things going there.
When you put the dynamat on the outter skin, ie floor pan doing 100% is a waste as mentioned before..

When applying the inner skins of doors as in your last pics your not really sound deadening but more increasing the audio sound..
Best audio comes from a solid wooden box. We can make doors from wood so applying 100% dynamat give the weight needed for the steel to act like wood..
You will still see a small decrease in exterior noise, but not as much as if applied to the outter skins

Have a read of the link in my first post, it explains it better.

[HuskyInAuz]

Everyone's hearing is affected by different environmental factors, low frequency, high freq, background, etc, so there will be different outcomes. I put a foil/butyl layer down on the floor and outside skins as well as inside door skins. What I did then was put a dense but thin, like 6mm, down over the top of that on the firewall and floor then put, with difficulty, the carpet/moldings back down. With my hearing the reduction in background noise with the ability to hear conversations front pas and rear pas seats was incredible, is as good at the European thingy.

When insulating engine rooms on a few boats there is a material that combines a lot of what has been talked about here, three-four distinct layers. Foam/Lead or HD material in lieu, and foil, it's anywhere from 1" (25mm) to 2" and very heavy. My reading are that sound can escape even through the smallest imperfection or gap and that is why we taped all the seams too. http://www.fisheriessupply.com/sites...ec&id=Soundtec
Now it's pretty impractical to put a 25-50mm layer down on the floor but one could put some of this stuff in doors and cavities. I wouldn't know where to source this.

[BigRAWesty]

Spot on. I layed a 25% coverage of dynamat then 100% coverage of a 10mm mass loaded closed cell foam with aluminium foil topping, then struggled to get floor in..
It went in but tightly lol..
And same, can now comfortably hold a conversation with the wife.
Sometimes I wish I'd left it alone...
;-)