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Db spl

Spl is sound pressure level (i.e., an acoustical measurement). One db spl is the smallest audible difference in sound level. 0 db spl is 0.0002 dynes/square centimeter or 20 micro-pascals. It is also the threshold of human hearing at 1 khz (the threshold of pain is between 120 and 130 db spl).

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