Noise reduction discussion

[Legacy777]

This is sort of a continuation of this thread regarding stiffer bushings, and pm's between Phil & I.

This is the most recent pm

"So what should my plan of attack be?

Should I use Dynamat stuff, or should I add to it?

The stuff I was going to use is called FATMAT and it's 100mil thick. Is this going to be enough for what I want to do?

What about home carpet insulation? Should I add that stuff too? It seems like that would be a sponge, which isn't what I want at all.

I just want a crazy quiet car. Kiss road noise goodbye and have piece and quiet.

What do you think?"


Road noise is typically middle to higher frequencies, and they need to be absorbed or attenuated. A porous or padding type of material works best.

I really haven't kept up with what products dynamat has out there, and if there's specific products for the floor pan or the like. I'm sure dynamat has products that will help cut the noise, but it may not be as much as you're wanting, so you may need a dynamat type of product and some form of insulating type aborbing material. The stuff under the carpet is the type of material you want.

A buddy of mine was telling me he could get it bulk some where. But that stuff on top of dynamat would probably give you the best results.

[BAC5.2]

In my quest for a quiet car, I was pointed here:

http://www.raamaudio.com/cgi-bin/index.cgi?p=pr

Closed cell under-the-carpet sound insulation.

My plan of attack is now as follows:

A layer of 100mil FATMAT on all surfaces inside of the car (floor, doors, firewall, roof, hatch, etc). With any remaining, I'll put another layer on the floor, the rear shock towers and firewall, any left over will go on the roof.

I'll then adhere a layer of the Ensolite below the carpet (attached to the stock carpet padding/insulation), and adhered to the topside of the headliner.

I feel like this will work pretty well.

[Legacy777]

Sounds like a pretty good plan.

[Psychoreo]

what'd you say? I can't hear you through all the insulation

[BAC5.2]

I read the "installs" section of RAAMaudio.com, and I'll be doing what it says.

A total coating of sound deadener. A total layer of Ensolite.

[93Leg-c]

BAC, please let us know how it works out.

[BAC5.2]

I will. It's a money issue at the moment. I need to buy a few things before I can invest in sound deadening. Brakes, and more audio goodies to start.

[SPUMONI_RT]

dynamat sucks it really doesn't dampen much carpet pad works well but it is a sponge the thicker the better most reveiws on dynamat are very bad like that it don't work at all or very little change unless you go all out a sound deaden everything everywhere i filled my trunk frame with expanding foam in a can "great stuff" and cut up an old trunkliner and but that over the inside of the trunk so its carpeted it made my trunk a lot heavier but less rattle and it is quieter out side of the trunk but thats not for road noise thats my only sound deadening mod i have made because i'm not gonna spend big bucks on dynamat if it don't even work that well

[gijonas]

^^ i think that response was intended for the "longest and hardest to read run on sentance without punctuation ever" thread.

[kimokalihi]

Did you ever get your car quiet?

I have done quite a bit of sound deadening on my metro and it's gotten a lot quieter. I put down 3 layers of Raammat on the floor, 2 layers on the walls of the car and 2 layers on the exterior wall of the doors and 1 layer on the interior wall of the doors. On top of that I put a layer of Ensolite closed cell foam on all of it and then I topped it off with a layer of this stuff from cascade

http://www.cascadeaudio.com/car_noise_c ... erial.html

Made a pretty big difference when I covered the floor pan of the car.

If I was going to do it again, I would probably cut back on the raammat butyl sound dampener and use more closed cell foams.

[Legacy777]

All I did was put dynomat around the speakers to help with vibration. I ended up bailing on this project.