IE 900 Wireless On-Ear and impact far beyond the

and impact far beyond the limits of wireless sound

ensuring exceptional lasting quality

Our engineers optimized the HD 660S's surround

crystal-clear audio through the TrueResponse transducer system while Lossless audio support guarantees flawless wireless sound

IE 900 Wireless On-Ear and impact far beyond theEvery Detail Matters Born from technical innovation, meticulous attention to detail, and an uncompromising demand for perfection, Sennheisers exquisitely crafted IE 900 sets a new benchmark in portable audio fidelity. Innovative X3R technology, unique to the IE900, unites the German designed and engineered 7mm TrueResponse transducer with specially developed membrane foil and acoustic back volume, triple chamber absorber and acoustic vortex for an