Jim Ourand queried:
>If a sound is 7db over "stock" is that a significant increase?
Umm, yep. A 3 dB increase represents a doubling of the acoustic
power radiated by the source. A 10 dB increase is generally
characterized as "twice as loud," based on subjective studies.
A 7 dB increase in sound pressure level (SPL) is a substantial
one, but most folks would say that it's not twice as loud as it
was before.
Jay
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