That calculator is good, but you have to be careful that you use the correct method of measuring sensitivity. Some companies base their measurements on power input and some base it on voltage input. Just be careful, because some specs just list sensitivity as a number: “X dB SPL” without specifying if that is X dB SPL @ 1mW or XdB SPL @ 1Vrms. This is an important difference! Easy to see if the spec lists it, but not all do (probably because the average consumer doesn’t care).
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