Our field coil drivers all require a power supply, sold separately. Any DC power supply may be used, although going beyond 17 volts is not covered under warranty…
Type III field coil drivers have yokes, top plates, and pole pieces all made entirely of Permendur, for the true ultimate in field coil driver performance…
Type II field coil drivers’ magnetic circuit use Permendur for the entirety of the top plate and pole piece, in combination with a pure iron yoke.
Type I field coil drivers’ magnetic circuits use a patented square wire coil for 99.9% packing efficiency. This results in a more efficient, powerful, and cooler-running motor.
The NF5ex is a tremendous value, achieving excellent results with its round wire exciter coil and spherical S10 iron yoke.
Each “Monster Alnico” motor uses a massive Alnico 5-7 magnet designed to realize ultimate quality in a permanent magnet speaker. To the best of our knowledge, these are the largest magnetic circuits ever made for full-range drivers of their respective diameters.
Feastrex’s original patent-pending Naturflux magnetic circuit is an immediately obvious innovation in magnetic circuit technology and represents an incredible value. Not only do Naturflux drivers achieve excellent gap flux density, that flux is extremely stable and able to be put to optimum use.