Input Sensitivity: Is the SPL (sound pressure level) a speaker will produce given one watt of power as measured from one meter away given a typical input frequency (usually 1khz unless otherwise noted on the speaker). Typical sensitivities for car audio speakers are around 90db/Wm. Some subwoofers and piezo horns claim over 100db/Wm. However, some manufacturers do not use true 1W tests, especially on low impedance subwoofers. Rather, they use a constant voltage test which produces more impressive sensitivity ratings.

 

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