This seems like a super clever idea

[Simonski]

http://www.fluxtone-speakers.com/Home_Page.html

making electromagnents instead of the usual ones seems like a no brainer but seems like it takes a while for someone to do it well

[borge]

These first loudspeakers used electromagnets, because large, powerful permanent magnets were generally not available at a reasonable price. The coil of an electromagnet, called a field coil, was energized by current through a second pair of connections to the driver. This winding usually served a dual role, acting also as a choke coil, filtering the power supply of the amplifier to which the loudspeaker was connected. AC ripple in the current was attenuated by the action of passing through the choke coil; however, AC line frequencies tended to modulate the audio signal being sent to the voice coil and added to the audible hum of a powered-up sound reproduction device

Not so great, I'd assume the VMT uses DC to avoid this but theres no real tech info on the site.....Very interesting none the less

[spasm6]

If you have to change out your speaker to one of their attenuating ones, how can they claim it's not changing your tone?