Sound power source

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Acoustic power of the sound source - total power of the acoustic wave emitted by the source. It can be defined by enclosing the sound source with a closed surface and summing the sound power stream through the surface. In this method it is assumed that the absorption of sound waves in the medium is negligibly small or the surface is closely surrounding the source. In the case of air, the first condition is met. The sound power unit is 1W.

Do not confuse acoustic PA power with the power of sound source P, which is the power consumed by the source. The ratio of these powers is the efficiency of the sound source & # x03B7; = P A P {\displaystyle \eta ={\frac {P_{A}}{P}}}

For speakers, it usually does not exceed a few percent. Speaker power P = U · I is the power supplied to the speaker. Sample sound power sources

The values ​​given in the table are approximate.

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