Dynamic and balanced armatures are drivers most commonly found in in-ear monitors (IEMs). Other than IEMs, dynamic driver design is also used in headphones and loudspeakers. It consists of a set of magnets, a voice coil and a diaphragm. The voice coil is attached to the diaphragm. When a current passes through the voice coil, a magnetic field that interacts with the set of magnets is generated. As the direction of current alternates, the voice coil gets attracted to or pushed away from the set of magnets, resulting in movement in the diaphragm (attached to coil) and consequently, air in front of the diaphragm.
In a BA design, the electric current flows through the coil that is wrapped around the U-shaped armature. As the current alternates, the bottom part of the armature gets drawn towards either of the magnets and moves up and down. A drive pin then transfers the movements to a stiff aluminium diaphragm/membrane. As the membrane vibrates, the volume of air enclosed above it changes to produce sound that escapes from the front nozzle. Read More