Miata Mailing List: September 1996, Message #0031
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   From: DOREBK@aol.com

Subject: Re:  (Tunnels are LOUD) eh?what did you say?

   Date: Sat, 31 Aug 1996 12:31:03 -0500



Robert Ullrich said:



>Allow me to second that!

>I drive through the Caldecott tunnel every day, and after doing some sound 

>measurements (for another project) the echoes, with the tire noise form

those 

>big rigs: > 122 dB 'c' weighted!  This is like standing next to a jet engine



>while it's running.  Needless to say, I don't hear my radio during that 

>time 

>Robert Ullrich



and then Chuck said: 



>Rolling up the windows helps a lot.  I am not sure how "a lot"

>translates into decibles.

>My wife and I discovered this when driving through the tunnel in the

>Presidio leading to the Golden Gate Bridge.



When I drove through there yesterday in my Rental Miata I was suprised at

how QUIET it was in the tunnel.  I downshifted and accelerated to try to make

some 

noise, but it didn't help.



I guess I'm just used to the sound of the Candoo Sport exhaust on my '90.



Brian Dore' 

San Francisco, CA (one more day)

DoreBK@aol.com (today)

bkd@usl.edu (thereafter)















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