Andrew Jones - New Company, New Speaker - Field Coil Concentric

Yup,

Permanent magnets are cheaper and don’t have the extra complication of power supplies.  Also the electromagnets produce a lot of heat so they cannot be enclosed in small boxes.  The market favored smaller speakers, particularly after stereo demanded two speakers.  

Wolf Von Langa Sons are amazing sounding field coil speakers.  I’ve had mine for over two years and they are wonderful sounding.  List price is  $17,900. True full range speakers that are two way, smaller size, not too heavy and 94-95db efficient. Use as little as 6 watts or nice SS if you like.   

Focal integrated Field Coil  drivers in their latest revision of the Utopia 'EM' models. The EM standing for ElectroMagnet.

https://www.focal.com/catalog/high-fidelity-speakers/home-speakers/utopia-iii-evo

@curiousjim wrote:

please explain.

Perhaps this video with Ken Songer of Songer Audio would be illuminating on the traits of (and a bit of history on) field coil drivers. I'm not affiliated with Mr. Songer's products nor have I heard them, but while it's a video on his speakers and the specifics of his driver it starts about by explaining a bit on electromagnets and their advantages over permanent magnets. 

@phusis 

Thank you for the link. I’ve probably watched a dozen videos so far and I understand how field coil works, but I still don’t understand the why. Before we were all born, a radio that produced 1/2 watt was amazing, but watts are not a problem anymore.  Someone said that field coil speakers were better because the power could be adjusted.  I didn’t find anything about that at all.  I guess if you are looking for a Dipole full range driver maybe’s? I’m still having trouble with this strong magnet vs that strong magnet.  Either way it seems to be a more expensive way to build a driver.

Thank again.