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Consumer Electronics by S. P. Bali

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LOUDSPEAKER IMPEDANCE

The impedance looking into the voice coil is not only the self-impedance of the coil itself but a combination of the self-impedance and the more important reflected acoustic impedance.

A parallel may be drawn with a transformer or motor. Each of these devices draws a small current when operating unloaded, indicating a relatively high input impedance. When the transformer secondary is loaded by an electrical resistance, or the motor shaft is coupled to a mechanical load, the input current rises and the input impedance of each device is lowered in proportion. In other words, the load impedance has been reflected into the input circuit in each case, whether it is an electrical load on the transformer or a mechanical load on ...

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