A type of dipole loudspeaker design which combines aspects of both dynamic and electrostatic designs. The planar speaker consists of a large plastic sheet with conducting wires embedded in it, these wires functioning as the voice coil. Many small magnets in front and behind the sheet set up a magnetic field so current in the wires causes a force on it and it moves as a unit, similar to an electrostatic speaker. Planar speakers suffer from the same directional problems as electrostatic loudspeakers, but their impedance is more similar to dynamic designs.