10-07-2011, 09:33 PM
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#13 (permalink)
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Enthusiast Member
Join Date: Aug 2010
Location: South Orange County, CA
Posts: 422
Drives: 2010 370Z Silver A7
Rep Power: 15
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Quote:
Originally Posted by B&W_Evader
Just got done doing the road test.
Speed was 65 mph
Data points w & w/o were done in 2 direction on the same stretch of hwy. Attempted to take readings in approximately the same spot to keep it controlled. 2 positions on meter, next to my right ear and approximately 4" off the center of the rear deck. Car was 6th gear, cruise control.
With---Without
74.9---76.8---Head
78.6---80.9---Head
76.8---77.9---Deck
79.0---83.0---Deck
I'll take it.  |
Those are substantial drops. The db scale is logarithmic, each 3 db drop is roughly a 50% reduction in sound levels. My reading is 67-68 dba (hit a bump and it goes higher) after all my work, however this can't be directly compared to yours because my meter is an iphone app not a calibrated meter. But for the sake of reference I get about a 66-67 db reading in the house (crickets outside an open window really show up on the dba scale) with the TV off yet there is no way that the car seems as quiet as the house.
Last edited by Guard Dad; 10-07-2011 at 09:43 PM.
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