Calcolatore Potenza Acustica — Formula

Sound Power Level

Sound power is the total acoustic energy emitted by a source per second, independent of distance or room.

Formula

Lw = 10 log10(W / W0)

  • *W* = sound power (watts)
  • *W0* = 10^-12 W (reference)

    • Sound power is an intrinsic property of the source. Intensity at distance r in free field: I = W / (4 pi r^2).

    Esempio Risolto

    A loudspeaker emitting 0.01 W.

    1. Lw = 10 log10(0.01 / 1e-12)
    2. Lw = 10 log10(1e10)
    3. Lw = 10 * 10 = 100 dB
    4. Intensity at 1 m = 0.01 / (4 pi) = 7.96e-4 W/m2