how much does dynamat really do

[Grafton]

So I've got the new axle back on and its not that loud, but it is deep and rumbly, sounds awesome, except inside the car its too much its like having the subwoofers cranked up you feel the exhaust note, i am wondering if dynamat would help lessen the in car deepness, from what i am reading online it would help. Driving 2+ hours in there is gotta be harmful lol

hopefully cutting out on road noise will cut back on exhaust noise just the one iota needed

i noticed the other day i could hear the crunching of leaves as i drove over them slowly, thats not a loud sound at all, not much sound proofing in the car imho

i am looking @ the ice and rain guard, extremely similar to dynamat in thickness and density:
http://www.lowes.com/lowes/lkn?action=p ... lpage=none (http://www.lowes.com/lowes/lkn?action=productDetail&productId=222287-711-5003026&lpage=none)
108sq ft for $74 and i have a $10 off coupon

anyone dynamat'd their car ? results?

[Huffer]

Depends on WHERE you apply it. Dynamat does nothing to really reduce in cabin drone fro
your exhaust system. For that you need a resonator. However, when properly applied on the doors and other panels it will greatly reduce the amount of sound energy escaping.

I tried the sound deadening solution on my impreza but the actual solution was to install/change the midpipe resonator. Along the way I found out a lot about sound energy and car acoustics. Spent a small fortune too!

[Grafton]

that is excitably the information i needed, Thanks!

looking into resonators now

[Huffer]

Fwiw, dynamat xtreme in my doors around the speakers and the exterior skin made a huge difference in the quality of my audio system. It also allowed my doors to close with a thunk instead of a rattle.

I hear fatmat is a cheaper alternative to dynamat.

[Soul Shinobi]

How much does it reduce road noise?

McMaster Carr, an industrial hardware and materials supplier has acoustic insulators, don't know how quality compares but knowing the site I'd expect it to be good for a good price.

http://www.mcmaster.com/#sound-control- ... on/=4dfgtj (http://www.mcmaster.com/#sound-control-insulation/=4dfgtj)

[1-3-2-4]

^ what I want to know as well.. i don't know if it's worth my effort and money to lay down this stuff.

[Huffer]

How effective it is depends entirely on position and the quality of application.

For example, putting dynamat xtreme behind a speaker or around the speaker cone will improve the energy output of the speaker.

However, it will do nothing to isolate the cabin from external noise (traffic). In order to do that, you have to overlap layers of insulation so that there are no gaps. Sound also travels in a linear fashion, in direct lines of falling strength(the further from te source the weaker the sound).

So, insulation being applied to the floor of a car that already has sound deadening applied will do nothing to help, but apply it to the doors, roof and firewalls will help tremendously. But there must be no gaps.

[Soul Shinobi]

I've notice the phenomenon from experience, just like cold air coming in your house from cracks around a window, significant sound can travel through small cracks. Will keep in mind.

Just for kicks, what do you think professional installation of sound deadening material all over a car to reduce road noise would cost? I know it might be a range, but my brother would like to know. He's looking for a new car, wants a Honda Fit but will pay for it to be real quiet.