Measuring Max SPL versus Frequency

This sequence characterizes the performance of transducers such as speakers, microspeakers and headphones by measuring how much voltage is required at each frequency to drive the transducer to specified limits of THD, Rub & Buzz, Perceptual Rub & Buzz or Compression. This is useful for detailed transducer analysis and determination of optimal power rating.

The user selects which metric is tested (one at a time is advised), the limit value and the stimulus start frequency. The sequence then uses an iterative looping process, initially with a +3dB step and then a +0.5dB step to precisely determine the value at which the limit is exceeded. This is repeated across the frequency range to generate curves of voltage and SPL vs frequency at the specified limit.

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