I found this on the Mission website, it's not quite what I thought.
In traditional Mission style, the standmount LX-1 and LX2’s tweeter is positioned below the mid/bass drive unit, in order to aid time-alignment. By placing the treble unit lower than ear level, the path length from the treble unit to the listener is longer than that of the mid/bass unit. As the treble unit dome is physically forward of the mid/bass unit cone, the difference in path length helps to equalise the acoustic distance.
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