I studied Classical guitar for 10 years and definitely agree that there is a clear difference between a rosewood sound box, such as my Ramirez had, and the spruce used in most flamenco guitars. I doubt that any luthiers use measurements and numbers to predetermine what SQ would emanate from the end product. They use their ears for the final judgment. Various woods are also used in speaker construction and will very subtly influence SQ. Ultimately most speaker builders also use their ears because numbers don't tell all. Stradivarius violins are still the best despite being built before there were any accurate measuring instruments. Harbeth speakers use tuned cabinets and I imagine the builders use trial and error to determine the final product. It would be hard to come up with measurements subtle enough to predict exactly how the end product will sound. ABX testing puts an unnatural stress on the participants thereby influencing their mood and hearing. I think that you have to live with almost any "upgrade" before you can accurately judge it.
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