At the heart of the AH-D7200 is that 50mm FreeEdge driver diaphragm, made from a nano-fiber material chosen for its rigidity and low mass. This delivers an accurate pistonic motion without distortion, and is also self-damping to cancel out unwanted resonances within the diaphragm. It’s mounted in a soft, compliant surround, making it easier for it to move in response to the music signal without flexing or distorting, for the purest possible sound.