Text: [Acoustics] The acoustic power radiated from a given sound source as related to a reference power level (typically 10-12 watts) and expressed in decibels as: Lw=10 log(W/10-12) dB or Lw=10 log W+120 dB where W = acoustic power in watts. By definition, one watt therefore corresponds to 120 dB for Lw.

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