Traditional modeling describes the heat flow in loudspeakers by an equivalent circuit using integrators with different time constants. The parameters of the lumped elements are assumed to be independent of the amplitude of the signal. The simple model fails in describing the air convection cooling which becomes an effective cooling mechanism if the velocity of the coil and/or the forced air in the gap becomes high. This paper presents a large-signal model considering the nonlinear interactions between the electro-mechanical and thermal mechanisms. The model and parameter are verified by practical measurements on drivers. The dominant paths for the heat flow are identified and means for increasing the power handling capacity are discussed.
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