Yes, my experience of the 101E's many years ago was the classic "disappearing" trick, being able to walk around them and not have a sense of the sound emerging from the drivers, I'm sure Tim would find them quite disturbing! Part of the answer is the omni thing, part probably that the cabinet reaction to the driver motion is balanced, not adding to the sound. And, partly due the speaker design forcing one to use top notch electronics to drive them - anything less is too unpleasant - so a lot of the usually necessary tweaking is automatically taken care of, by default.
Frank
Frank