Sound power level

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Template:Sound measurements

Sound power level or acoustic power level is a logarithmic measure of the sound power in comparison to a specified reference level.

The measure of a ratio of two sound powers is

<math>

L_\mathrm{W}=10\, \log_{10}\left(\frac{W_1}{W_0}\right)\ \mathrm{dB} </math>

where W₁ and W₀ are the powers.

The sound power level is given the symbol L_w or SWL and is measured in "dBW", which stands for decibel with the suffix for watts. Decibels are dimensionless. SPL stands for sound pressure level, and is not the same thing.

If W₀ is the standard reference sound power, where

<math>W_0=10^{-12}\ \mathrm{W}</math>

(W = watt), then instead of "dB", dB SWL is used. (SWL = sound power level).de:Schallleistungspegel es:Nivel de potencia acústica