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Loudness volume doubling sound level change factor of perceived loudness decibel scale log compare intensities formula calculate power level noise levels volume logarithm dependence three four fold loudness sound - by what
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Sones phons loudness decibel sone 0.2 - 0.3 - 0.4 - 0.5 - 0.6 define sone rating conversion dB level dBA phon phone volume intensity calculator dB dBa and Sone relate fan
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