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.

The minimum input level signal required to output a specified output level.

The voltage required at the input of an electronic device in order to produce the rated electrical output. For example: in power amplifiers, the input voltage needed to produce the rated steady-state output power.

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