Doubling pressure yields 6 dB and a tenfold increase yields 20 dB.

Evidence

Doubling the pressure level results in a 6 dB increase in sound pressure level, and a tenfold increase in pressure level results in a 20 dB increase in SPL. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 219

Categorization

• SHARE: A crisp concrete anchor (6 dB per doubling) that would remind a studio engineer friend of the same rule.