The QUAD ERA-1 are planar diaphragm headphones that have an open and transparent performance that results in sonic realism and fidelity. It 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 system, designed to maximize sensitivity and consistency of the applied force over the driver area.