The new IE 900 from Sennheiser sets a new benchmark in portable audio fidelity through technical innovation, meticulous attention to detail, and an uncompromising demand for perfection. The IE 900?s acoustic design ensures brilliant, natural high-end sound reproduction. It features a refined version of Sennheiser?s 7mm audiophile Extra Wide Band XWB transducer system, engineered to tighter tolerances and expertly tuned for even greater fidelity, and a unique triple-chamber absorber T3C