The ATH-M40fs has been discontinued and replaced with the ATH-M40x Professional Monitor Headphones.
Audio-Technica’s premium professional studiophones offer a flat, extended frequency response for professional studio monitoring. Superior components provide very high SPL capabilities while maintaining exceptional clarity of sound. Exterior design features include sturdy strain-relief cable and comfortable circumaural earpieces that can be rotated 180º to permit one-ear monitoring. The studiophones utilize 40-millimeter drives with neodymium magnets and copper-clad aluminum wire voice coils for lowest mass. They are equipped with an 11-foot cable terminated in a standard ¼-inch connector. This field-serviceable model allows elements, cables, and earpads to be replaced in the field if needed.