Atmasphere,
Just read about field coil technology. Everything old is new again.
This makes incredible sense to me.
Since loudspeakers are the greatest producers of distortion, essentially due to a lack of control over the moving mass--(over simplification but the basic idea is there), the field coil acts to virtually eliminate it with greater flux density, aka, magnetic strength. I know you know this, I only mention it to help others understand the basic principal. I know I was not aware of these beauties.
Wow, I'd love to hear these things. I'm not in the market at this moment, but, who knows.