Audio-Technica ATH-M50x Professional Studio Monitor Headphones - Black with FiiO E6 Headphone Amplifier This Kit Includes Some Of The Essential Accessories You Need To Take Full Advantage Of Your New Audio-Technica ATH-M50x Professional Studio Monitor Headphones Critically acclaimed sonic performance praised by top audio engineers and pro audio reviewers. &gt; Proprietary 45 mm large-aperture drivers with rare earth magnets and copper-clad aluminum wire voice coils Exceptional clarity throughout an extended frequency range, with deep, accurate bass response. Circumaural design contours around the ears for excellent sound isolation in loud environments. &gt; 90 Degree swiveling earcups for easy, one-ear monitoring, professional-grade earpad and headband material delivers more durability and comfort. Detachable cable. FiiO E6 Headphone Amplifier &lt;&gt; For high impedance or low sensitivity Hi-fi headphones