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Measuring the Loudspeaker's Impedance During Operation for the Evaluation of the Voice Coil Temperature

Voice-coil temperature in high-power loudspeaker systems may reach values of more than 250°C. The increase of temperature produces an unwanted effect known as power compression and at higher temperatures loudspeaker damage will : occur. Knowledge of the actual voice-coil temperature, under operating conditions, is required to compensate for this power compression and to prevent any loudspeaker damage. Using only the operating signal, short-time spectra of the voice-coil voltage and current are calculated and used to derive the impedance characteristic. The change of dc resistance is derived from the real part of the impedance, and then the temperature can be calculated.

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