With loudspeakers operating in a high power environment (common in PA systems), the voice-coil overheating and the excessive cone displacement are the main causes of damages and faults. These drawbacks are related to the low efficiency and cone displacement limitation, respectively. This paper proposes a procedure to measure and control both the voice-coil temperature and cone displacement by using a digital signal processor (DSP). The voice-coil temperature and cone displacement are indirectly obtained from the coil DC resistance variation and the cone acceleration, respectively. This approach takes into account (by measuring) some real characteristics of the loudspeaker, as its inherent nonlinearities. Thus, we can obtain the most from the sound system, since it may now work without the usual safety margin needed for these systems.
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