Featuring a hybrid multidriver system, the ATH-IEX1 in-ear headphones deliver smooth, natural sound reproduction across the entire frequency range, with the capacity for reproducing Hi-Res Audio. Contained within the headphones’ solid titanium housings are dual phase drivers of different diameters (9.8 mm and 8.8 mm) plus two balanced armature drivers, positioned on a coaxial line. The 9.8 mm works as a full-range driver, while the 8.8 mm functions as a passive radiator to strengthen the lower frequency. Those two units face each other, their diaphragm movements syncing to minimize distortion and provide audio that is true to the original sound. The balanced armature drivers act like super tweeters to contribute accurate, high-frequency reproduction. Hybrid multidriver system incorporates dual phase drivers (9.8 mm + 8.8 mm) plus two balanced armature drivers, positioned on a coaxial line for smooth, natural sound reproduction Ergonomic over-ear loop design for a custom fit and long-wearing comfort Two detachable 1.2 m (3.9') cables with A2DC (Audio Designed Detachable Coaxial) connectors at the headphones: one with a 4.4. mm, 5-pole balanced plug, the other with a 3.5 mm, 3-pole stereo mini-plug Ergonomic titanium housings ensure superior fit and ideal sound reproduction Two-position eartip post allows you to adjust the position of the eartip for best fit Includes silicone eartips (XS/S/M/L), Comply™ foam eartips (S/M/L), cleaning cloth, and hard carrying case Each pair of headphones is individually identified by a laser-etched serial number