The capability of a moving-coil loudspeaker to sustaining a certain power is related to its capability of dissipating heat produced by the Joule effect in the moving coil and, due to eddy currents, in the pole piece. Different heat transmission phenomena were analyzed in order to determine a lumped-element thermal model realistically related to the physics of the process. The model is based on the Zuccatti-Button approach. However, a more detailed model has been developed in order to consider all the heat transmission processes involved. In particular, forced-air convection, induced by the cone movement at low frequencies (30-150 Hz), has been taken into account.
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