Rough road noise is transmitted by the suspension, but it's the large flat panels that act as sounding boards, amplifying like the back of a cello. 

Karl Wolz
Sent from my electronic umbilicus

> On May 24, 2015, at 8:54 AM, Rocket J Squirrel <camping.elliott@GMAIL.COM> wrote:
> 
> For me, the vast majority of cabin noise is tire-on-road noise. The
> difference between a rough asphalt freeway and a smooth concrete one is
> dramatic. That noise is transmitted mechanically from the bearings up
> through the various suspension and possibly steering bits to the frame
> and then into the cabin.
> 
> Sound deadening doesn't seem like it can touch that, considering how
> relatively quite the ride is on smooth concrete. Deadening can affect
> that residual noise (wind and stuff) but once the road is rough, I think
> I'd be stuck with the mechanically-borne noise.
> 
> --
> Jack "Rocket j Squirrel" Elliott
> 1984 Westfalia, auto trans,
> Bend, Ore.
> 
>> On 05/23/2015 09:57 PM, John Rodgers wrote:
>> The time has come when I MUST do something about the noise level in my '88
>> GL. I seem to recall some discussion about a product at Home Depot or Lowes
>> that works. I'm sure theres others. Anyone know it's name? Any other
>> suggestions as to what to use.
>> 
>> Thanks..
>> 
>> John
>>