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Automated Measurements of Loudspeaker Small Signal Parameters

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A computer controlled system for measuring small signal parameters of loudspeakers will be presented. The system uses a signal generator, voltmeter, phasemeter, and ohmmeter to measure the free air resonance frequency and Q. The loudspeaker is placed on a box and the measurements are automatically repeated. These measurements, in conjunction with a voice coil resistance measurement, give all of the information needed for calculation of the loudspeaker parameters. The program calculates and prints the values. A flowchart and a listing of the BASIC language program are given. Examples of the measurements will be presented.

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