QUAD has drawn upon its expertise with electrostatic loudspeakers to design its planar film diaphragm headphones the ERA-1. To ensure a natural sound in keeping with the companys heritage QUADs engineers have developed a planar magnetic drive film delivering fast open and transparent performance similar in quality to the famous ESLs. The QUAD ERA-1 incorporates an ultra-thin electrically active diaphragm – thinner than a human hair yet extremely strong and highly elastic weighing less than the volume of air it displaces. This is fused with a precisely arranged magnet array designed to maximise sensitivity and consistency of the applied force over the driver area.