Bub....naughty bub .....I didn't say that and you know it!  I don't pretend to have all the answers. I know what I hear and understand the physics, thought don't think getting wrapped up in an argument over semantics will actually help the thread.

Paul that is the best explination as to what I and other experienced. The dealer who was doing the demo had no explination, though had been at similar demo back at quad hq a couple of years previous , if my memory serves.

I tried the head tilting,  head back made the percived image go low. Head up made the percived image go high.  In other words as the ears moved through an arc the actual image remained in the same place.....my wife said what she heard had remained completely still ?