Thread: Sound deadening
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      02-25-2016, 08:03 PM   #79
Kantalias
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Drives: 2016 M2
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Quote:
Originally Posted by Adem1534 View Post
No, no, no. Let me clear this up. The decibal scale is logmarthmic, not linear.

72 decibals is approximately 58% louder than 70 decibals.

That's a lot!!!
Actually, dB SPL = 20*log10(P/Po) so a doubling in sound pressure occurs every 6 dB, not every 3 dB. The reference power Po is 20 uPa. So...72 dB SPL is 25% louder than 70 dB SPL.

However, nikotine30 is absolutely right in his post about psycho-acoustics: it takes a 10 dB SPL increase for something to be perceived as twice as loud. Therefore, 72 dB SPL would be barely perceivable as being louder than 70 dB SPL.

The M2 is a loud car relative to most, but it's "all relative" as they say. The M2 is about the same at 70 MPH as an R8, a 1M, E9X M3, Mustang GT500, 370Z, or WRX; and the M2 is quieter than a Viper, Elise, GT-R, or 911 GTx.
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