a method is described whereby composite materials and computer - controlled machining are used to completely encapsulate the conductors in the stators of an electrostatic loudspeaker . this process solves many difficult problems inherent in the construction of such speakers . these include the need for outstanding electrical insulation , avoidance of damage due to arcing , elimination of protective circuitry , durability , a high degree of flatness , high efficiency , light weight , ease of construction , and pleasing appearance .