Magnetic topologies for loudspeakers have remained essentially unchanged since the conversion from electrodynamic to dynamic magnetic structures. By utilizing the magnetic technology developed for long-stroke linear actuators, a neodymium magnet circuit was developed by dynamic loudspeakers that uses a radially charged magnetic topology. Benefits of this topology include large linear travel, low distortion, and high-power handling. The topology is also inherently shielded. The technology has been successfully demonstrated in dynamic cone-type direct radiator transducers that range in size from 2 to 18 in. in diameter.