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Date:         Sun, 24 May 2015 14:29:57 -0700
Reply-To:     Rocket J Squirrel <camping.elliott@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Rocket J Squirrel <camping.elliott@GMAIL.COM>
Subject:      Re: Sound deadening
Comments: To: Karl Wolz <wolzphoto@q.com>
In-Reply-To:  <4ADB0342-FC8E-4927-8766-05575EDC3A58@q.com>
Content-Type: text/plain; charset=windows-1252; format=flowed

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 >>>


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