The ATH-M20x professional monitor headphones are a great introduction to the critically acclaimed M-Series line. Modern design and high-quality materials combine to deliver a comfortable listening experience, with enhanced audio and effective isolation. An excellent choice for tracking and mixing. _ Features Advanced build quality and engineering 40 mm drivers with rare earth magnets and copper-clad aluminum wire voice coils Tuned for enhanced low-frequency performance Circumaural design contours around the ears for excellent sound isolation in loud environments Convenient single-side cable exit Designed for studio tracking and mixing _ Specification Type : Closed-back dynamic Driver Diameter : 40 mm Frequency Response : 15 - 20,000 Hz Maximum Input Power : 700 mW at 1 kHz Sensitivity : 96 dB Impedance : 47 ohms Weight : 190 g (6.7 oz), without cable and connector Cable : 3.0 m (9.8'), straight, left-side exit Magnet : Neodymium Voice Coil : Copper-clad aluminum wire Accessories Included : 6.3 mm (1/4") snap-on adapter