FAL's flat unit construction consists of a thick die-cast aluminum frame with a large neodymium magnet,
The diaphragm is made of lightweight and rigid Styrofoam with reinforcing ribs and papyrus surface, and the voice coil bobbin is made by Dupont of France.
The voice coil bobbin is made by Dupont of France, and the edge is double-edged with Toray's Ecsaine, which is soft but strong and drives the diaphragm firmly, achieving both linearity, high efficiency, and high durability.
The voice coil bobbin is rectangular in shape to match the diaphragm, with silver wire wound twice around the outer and inner sides, and a magnetic circuit of neodymium magnets sandwiches the voice coil.
