I like the article in many respects, considering it's just begun. However, adopting my persona as an Average Reader, I have some questions. Just how does the moving iron get forced to move? Isn't it just a variation on the magnetic force causing a coil attached to a cone of some sort to move? Why are they confined to cheaper usaes today? Is it only the low quality? And it seems that whatever the motive technique, cannot the various ways of loading it acoustically be equally applied, lower quality higher distortion aside? If the article addressed these issues, I would have a clearer idea in mind of where this design approach fits in the range from piezo through voice coil to Heil to electrostatic.