HIFIMAN Edition X Over Ear Planar Magnetic Headphones Ultra Thin Diaphragm for lightning fast response, uncanny detail and ultra low distortion High Sensitivity allows use with virtually any smartphone or portable audio device. Low distortion and amazing sound quality. Window Shade Grill Design greatly reduces sonic reflections for clearer sound. Asymmetrical Ear Cups follows the natural shade of the human ear. Hybrid Ear Pads beveled design conforms to the shape of the human skull while velour and pleather materials provide optimum comfort.