DIY 802 field coil drivers may be a reality!!

[BillWojo]

I don't understand this "bucking" either. Jeff, can you give us a detailed explanation of what your referring to?
As I understand it, a FC motor uses a strong electromagnet fed with a robust, filtered and regulated DC voltage. There is no ripple or any disturbance in the field coil gap either from the DC power supply or induced by the voice coil. As long as the DC power supply is working properly, there is never any change in the magnetic flux in the gap surrounding the voice coil. It remains the same from day one to the date that the system is retired.
That is very unlike alnico magnets that are always loosing there magnetic field strength due to aging, a well documented problem. Not to mention that over powering an alnico driver will also substantially damage the magnetic fields strength. Also well documented. And that may be the weakness in alnico or any permanent magnet structure. If playing a strong signal through a voice coil can damage the alnico magnet, what is a weaker signal doing to the magnetic field in the gap? It may be causing distortion of the signal being reproduced.
Think about it.

BillWojo

On Edit: Steve, I want to thank you for your explanation, it gives one enough to calculate the coil specs.