[Doc Weaver]

Bob, you are correct. One of the downfalls of a Freightliner is the noisy cab. Don't get me wrong, I prefer the Freightliner.

The doors, floor and ceiling can be dealt with, but the large windshield is just something we are stuck with. (excuse the grammar). The local car stereo store will try to get you to use dynamat everywhere. Although Dynamat is a decent product, there are different tools to use for different problems. Dynamat is great for noises from creaks and squeaks. There are barriers that are good for sealing out road noise and absorbers that are good for ambient noise. The one most miss in a truck is the rumble from the heavy duty parts under the truck. This is problem for a decoupler. A decoupler will stop the transfer of noise through the body parts.

I used Cascade Audio materials. In fact, I used their engine compartment material for my gen set box.