The unit for measurement of the apparent (subjective) loudness level of a sound. At 1,000 Hz, the phon rating corresponds to the measured sound level. At all other frequencies, a sound level which – to the listener – seems to be of the same loudness as the 1,000 Hz tone, is given the same phon rating, regardless of the actual measured sound level.Phase shift, equalizer — The phase shift introduced in a signal path by the insertion of equalization.
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