Balanced Armature drivers are capable of reliably reproducing high-fidelity sound in an exceptionally small size because they incorporate a specially constructed armature (or reed) that is balanced in the static magnetic field between two magnets. The AC signal in the static coil creates magnetic flux in the reed that caused it to deflect within the magnetic field. The reed motion follows the AC signal, and is transmitted to the diaphragm through the drive rod connecting the two. The aluminum diaphragm is stiff and hinged at one end to control its motion for excellent clarity. Compared to dynamic speakers the coupling of the magnetic circuit is stronger in a Balanced Armature driver. The magnetic proximity is tighter, creating a larger driving force. The end result is higher output for a given size. Since the coil is stationary there is a lot of flexibility in the winding design to meet individual application requirements.