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    The reference value for sound intensity, I 0, also represents the intensity at the threshold of hearing and it is for this reason it was chosen as the reference level.Because the sound pressure and sound intensity scales are both referenced to the threshold of hearing, in simple cases the decibel reading can be assumed to be identical for both (Watson and Downey, 2013).

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    Since sound is measured on a logarithmic scale (think Richter scale like with earthquakes) and a 6 dB difference results in a sound pressure level twice as “loud,” 5 dB is a relatively significant difference. Still, should an almost-twice-as-loud sound pressure level at 3150 Hz be enough to justify a 5 point reduction in an IIC rating?

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