IE 900 Wireless On-Ear Our engineers optimized the HD

Our engineers optimized the HD 660S's surround

Nothing makes music feel dramatic like powerful bass

while Sennheiser’s 7mm TrueResponse transducers ensure incredible tonally neutral

Calls sound more natural thanks to an advanced digital beamforming microphone system with automatic wind noise suppression

IE 900 Wireless On-Ear Our engineers optimized the HDEvery 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