Measurements & Sound Quality
"One of the worst-kept secrets in audio engineering is that what we hear does not always correlate with what we measure." So wrote the late Richard Heyser 30 years ago, as quoted in Time">http://www.stereophile.com/historical/572">Time Delay Spectrometry, a 1987 anthology of his writings (footnote 1). What do we hear? Music heard live consists of a sound pressure that changes according to the logical demands of two things that have no physical reality: the way in which music is structured in time and pitch, and how that structure is ordered by the composer/musician. Heyser, one of the most perceptive audio engineers I've had the privilege to meet, repeatedly emphasized in his essays and papers that the reproduction of music is a multidimensional event.