Sure, makes sense, but the whole darn body is a sounding board,
including the glass and the fiberglass Westy top. That's a lot of
dampening that needs to be applied. I'm personally not convinced that
one can make much of a dent in the low-frequency roar of the road. A few
fellows used their sound level meters to try to do before and after
measurements but they used "A"-weighting which makes the meters far less
sensitive to low-frequency sounds, so they weren't measuring the bulk of
the noise; and I don't recall them driving the same stretch of road for
the before and after. The impression I got what they they said that they
thought things were quieter. The acoustician in me needs numbers, man!

--
Jack "Rocket j Squirrel" Elliott
1984 Westfalia, auto trans,
Bend, Ore.

On 05/24/2015 11:07 AM, Karl Wolz wrote:
> 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
>>>