The precision-manufactured aluminum housing of the IE 900 faithfully protects the dynamic TrueResponse transducers at the heart of Sennheiser’s innovative  X3R technology. Experience peak German audio engineering with earphones that deliver only the purest, most natural sound.

New benchmark in portable audio
Ultimate precision & craftsmanship
Made in Germany
X3R technology: TrueResponse transducer combined with three Helmholtz resonator chambers and acoustic vortex
Precision-milled and anodized aluminum housing
Hand-assembled at Sennheiser´s headquarters
Gold-plated Fidelity ( ) MMCX connectors for improved stability
Choice of para-aramid reinforced cables (2.5 mm, 3.5 mm, 4.4 mm)
Adjustable ear hooks and choice of ear adapters including memory foam