Sound Deadening, A little more technical question Options

[r_towle]

Hi,
I have been reading lots on the Internet, and the more I read, the more I find that no-one has done any real analysis.

What type of sound does a motor make?
Is it vibration, or soundwaves?

I guess what I am looking for is not the Use Dynamat, Use Brown Bread type of answer.

What if I combined both the ceramic spray on products, and the peal and stick products?
Aside from throwing alot of money at the problem, am I really stopping any more sound waves from coming through?

Are there any discussions of what sound waves Dynamat stops, and what sound waves a spray on ceramic sound deadening system stops?
Are they the same waves?

It seems to me that when you use two of the correct products, each designed to stop a certain type of sound wave, you will get a much better result.

But, where is the info telling me which sound wave is stopped by what product?

Rich

[r_towle]

OK,
To be a bit more specific.

I am considering DD a 356 coupe.

Ride in one, its loud.

So, I was considering all of these items.

First layer, ceramic spray on, inside and out of the rear passenger area, firewall.
Seconlayer, Dynamat (or equivelant)
Third layer, proper tar paper cut to size for 356 to give it the correct look.

But, I fear the window may be the big issue on this as well.

Currently, I can not hear my phone, nor have a conversation while driving.
This is my job, so there are no options, either I fix this, or buy a newer car.

My rational is like this.
The 356 gets 32 MPG all day long.
It looks cool
I can buy and build a really nice one, with AC for less than a ho-hum new car.
So, get a 356, convert to 12 volts, add AC, and use new technology to sound deaden the car.

Weight, yup, its is an issue, and will affect MPG, but I will still get better than an SUV.
Never gonna race it.

This is my approach.
Find all the new research, new technology and apply that to the sound issue.
Most 356 guys restore them to original, but dont drive them because of two major things.

Its a very hot car to drive, no AC and little air flow.
Its very loud (wife does not like it)
And for me, I cant use the phone.

I sell, on the road. I need the phone, I use it while driving, for hours at a time...
I get on calls between appointments, so pulling over is not an option.
Have lots of headsets, still no good.

So, looking for some real suggestions to tone down the noise.
Dual carbs and filters will not be removed.
And I want it to kinda look stock. Not to a trained judge, but to anyone else.
Rich