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What is Sound Pressure Level, SPL?

April 26, 2017level pressure sound SPL

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What is Sound Pressure Level, SPL?

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SPL numbers are a way of describing the relative level of a sound compared to the lowest possible sound a human can hear. The lowest physical sound pressure detectable by humans is 0.00002 pascal (Pa) and that equates to 0dB SPL. To Calculate SPL in dB: dB SPL = 20*LOG (Sound Pressure/reference pressure, or, 0.00002) So, for a person sitting 3 feet from a television set, the sound pressure is 0.02Pa. The corresponding SPL in dB is: SPL = 20*LOG (0.02/0.