Because the human ear discriminates against low frequencies (see EQUAL LOUDNESS CONTOURS), any measurement of the subjective response to SOUND PRESSURE must be adjusted to match the sensing characteristics of the ear. This weighted measurement of sound pressure is called 'sound level', as compared to SOUND PRESSURE LEVEL, which is an unweighted, objective measurement of sound pressure. Sound level is measured with a SOUND LEVEL METER.
See: INTENSITY LEVEL, NOISE LEVEL, PHON. Compare: HEARING LEVEL, LOUDNESS LEVEL, NOISE CRITERION, NOISE RATING, PERCEIVED NOISE LEVEL, SOUND POWER LEVEL, SPEECH INTERFERENCE LEVEL, VOLUME.