As was mentioned in my first reply, the difference in sensitivities doesn't change with changes in volume levels. There's no need to "predict" anything. Whatever the incoming voltage from the source material is at a given instant in time, it's subjected to the same gain(around 14dB for the preamplification and 28dB for the amplification, increasing the voltage about 120 times)and results in the speaker being audible.

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Enjoy the music, not the equipment.