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Consumer Electronics by S. P. Bali

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ACOUSTIC IMPEDANCE AND RESONANCE

The resistances and reactances of the system (including acoustic, mechanical and electrical effects) combine in the effective impedance looking back into the voice coil. This combination is best visualised by an equivalent circuit illustrated in Fig. 4.16. The efficiency of power transfer is dependent on the proportion of the impedance represented by RA, which represents actual acoustic power dissipated in overcoming air friction and in radiating the acoustic power.

As in a purely electrical system, the capacitive reactance CC resonates with the combined inductive effects LV, MC and MA at some frequency called the resonant frequency of the speaker. At the resonant frequency, all reactance is cancelled out of the ...

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