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.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.