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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
dB(A) - INERTANCE, dB Calculator, dB plus, Add dB, Sound calculator
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SPL sound level to dB pressure level sound pressure sound intensity unit dB Conversion of sound pressure to sound intensity sound units levels calculating spl sound level calculation air sound units level