Wikipedia (Beta): Acoustic impedance

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The acoustic impedance Z (or sound impedance) is a frequency (f) independent parameter and is very useful, for example, for describing the behaviour of musical wind instruments.
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    Efficiency of a loudspeaker
    This is the effective measurement for the acoustic power of a loudspeaker. In other words: its capability to transform electric energy into acoustic energy. Clearly the greater the efficiency of the loudspeaker, the greater the quantity of electric energy which gets transformed into acoustic energy.

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