A new method for measuring sound absorption
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The electric impedance of a loudspeaker depends upon the acoustical load and may be used for measuring this load. The relation between the electric impedance of an electrodynamic loudspeaker and the acoustic impedance in front of the loudspeaker is given and discussed in detail. The consequences of the flexibility of the cone are studied. Simple formulas and graphs are given, connecting the electrical behaviour and the absorption coëfficient corresponding to the load on the loudspeaker. The method seems to permit absorption measurements at low frequencies (e.g. 50–500 Hz).
KeywordsSound Absorption Inversion Centre Inversion Point Extreme Left Double Ratio
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