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A siren at 30 ft distance can have a sound pressure level of L = 130 dBSPL.

Never forget to tell the distance of the measuring microphone from the sound source, because the closer you are the louder it is.

The sound pressure level decreases by 6 dB per doubling of distance from the source to 1/2 (50 %) of the sound pressure initial value.

The sound pressure decreases inversely as the distance increases with 1/r from the sound source.

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βˆ™ 14y ago
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βˆ™ 13y ago

A woman is capable of screaming at a level of 120 decibels, although this would not be an average. To put this in perspective, normal conversation ranges from 45 to 60 decibels, and a gunshot is 110 decibels.

However, South Australian Simon Robinson produced a record-breaking scream measuring 128 decibels at the Guinness Challenge in Adelaide, South Australia, on 11 November 1988.

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Q: How loud is a scream?
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