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That is true for the final research of Olive that lead to the here discussed equation and score, though systematic testing to understand the correlation of measurements and listeners preference was started much earlier by Toole, for example in 1986 Toole published the results of a two-year study where forty-two listeners evaluated thirty-seven different loudspeakers.If you mean by yet as the time the Harman/Olive test were done and my speakers were designed, you are wrong. I designed Silver 5L during 1991. Harman/Olive patent was granted in 2005. I expect their tests were done in the noughties, i.e a decade later.
Also in 1990, Klippel reported a perceptual-based loudspeaker model for predicting various sound quality dimensions and overall sound quality. The model was based on a massive study involving seven different experiments designed to examine the influence of factors on loudspeaker quality such as listener experience, room acoustics, speaker directivity, program material and method of scaling (semantic differential versus MDS). A total of forty-five different loudspeakers (both real and simulated), three different rooms, thirteen programs and forty different listeners were compared. The rooms included an anechoic chamber, an IEC listening room and a small studio. Factorial analysis revealed seven unique dimensions such as clearness, treble stressing (sharpness), general and low bass emphasis, feeling of space, clearness in bass and brightness.
Source and more: https://patentimages.storage.googleapis.com/95/03/0a/a4a8dbd7d8042c/US20050195982A1.pdf