herman, I agree with you on as not all measurements, performed on not always perfect testers are telling us whole story. Measurement equipment has many issues by itself, such as temperature drifts, noise floor, sampling accuracy issues, internal reference clock drifts, calibration, user’s training, and more.
I worked in recording studio on mixing some tracks in the past, and initially I was really surprised how coffee break can change the sound perfection! At some point in the studio we used simple radio to hear the sound, to make sure it sounds right to everyone. Therefore I am very pessimistic on relying on listeners type of sound quality tests.
I would love again to hear “blind test” stories, with more than two people participating in component brand A/B/C/D grading sound “quality” without knowledge of unit under test.
My point is very simple: excellent sound component manufacturers know how to test all components, including parts used in product’s assembly, and final product test, in production flow to ensure every unit “meets the spec”, and therefore they have in place all needed test procedures, equipped with accurate test equipment and provide training for staff.
I worked in recording studio on mixing some tracks in the past, and initially I was really surprised how coffee break can change the sound perfection! At some point in the studio we used simple radio to hear the sound, to make sure it sounds right to everyone. Therefore I am very pessimistic on relying on listeners type of sound quality tests.
I would love again to hear “blind test” stories, with more than two people participating in component brand A/B/C/D grading sound “quality” without knowledge of unit under test.
My point is very simple: excellent sound component manufacturers know how to test all components, including parts used in product’s assembly, and final product test, in production flow to ensure every unit “meets the spec”, and therefore they have in place all needed test procedures, equipped with accurate test equipment and provide training for staff.

