Engineered for digital program materials, the Audio-Technica ATH-M3X closed-back dynamic stereo headphones are equipped with high-performance drivers and low-mass diaphragms for maximized power handling capability. The closed-back design of the earpieces isolates the listener from distracting sounds. The headphones incorporate 40mm drivers to deliver wide dynamic range. Diaphragms only 25 microns thick provide the ATH-M3X with a frequency range extending from 20 to 21,000Hz.