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According to the scale on this page, 0 dB (aka 0 dB-SPL) is the sound level in a recording studio: We said above that the decibel is a ratio. So, when it is used to give the sound level for a single sound rather than a ratio, a reference level must be chosen. For sound pressure level, the reference level (for air) is usually chosen as pref = 20 micropascals ...

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