Abstract
In this paper, three methods are discussed for experimentally isolating the blocked electrical impedance of a loudspeaker driver. The first involves measurement of the voice-coil impedance in a vacuum, before and after an added mass is applied to its cone. The second involves the use of a scanning laser Doppler vibrometer in conjunction with frequency-dependent electrical measurements at the driver terminals. The third involves the traditional destructive method of potting the driver in a hard-drying compound to allow direct measurement of the blocked impedance. The advantages and disadvantages of each method are discussed. The impedances determined by the three methods are used to predict the frequency-dependent cone velocities of several drivers while under operation. Actual measured velocities are compared with the predictions to substantiate the accuracy of each method.
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