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The tuning is done by a very evolved phase correct crossover. It has 12 fine tuning pots. The idea is that if one speaker is more near a corner and bass heavy you can tune down the more active frequencies to achieve a normal tonal range for the room. How many people play with speaker placement and room acoustics to get the right bass or highs, shouldnt you be able to tune the speaker to the room rather than tune a room to the speaker?
Having the tonal range match on each speaker adds to the openness and soundstage. Take a piece of paper and put it over one of your speakers and listen it would blow the sound stage and you would be able to hear each speaker instead of them blending together. Tuning each one helps the vandersteens blend together and get a consistent sound in almost any environment.