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Voice coil temperature monitoring: a new in-house developed measurement system

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The increase in temperature of a loudspeaker voice coil (VC) might damage the electrodynamic transducer and produces power compression effect. Usually, DC resistance is evaluated and related to VC thanks to standard thermal coefficients. Unfortunately, typical commercial tools are not customisable according to the user’s needs. We have developed an instrument based on the same principle, allowing for user definition of the thermal coefficients, customised software interface, portable and able to increase our lab capabilities. DC resistance of a compression driver and two woofers is measured during life tests using our system and results are compared with Klippel Power Test module (PWT), considered the gold standard. Results showed differences lower than 3.5%, confirming the validity of the new instrument.

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