The IE 600 from Sennheiser embodies the audiophile passion for quality with meticulous craftsmanship and exquisitely neutral sound. Sennheiser’s TrueResponse transducers ensure incredible, tonally neutral, true-to-life voicing and impactful bass response. The unique dual-chamber absorber system removes masking resonances for a refined and extended treble. A specially developed membrane foil minimizes resonances and distortion to let details shine. For incredible resilience and lasting great looks, the IE 600 features 3D printed housings made from ZR01 amorphous zirconium that delivers triple the hardness and bend resistance of steel. Production of this metal housing takes place in Germany and includes both automated and manual steps. A computer-controlled laser sinters a thin coat of metal powder, welding the molten alloy to the already hardened material beneath it. Layer by layer, the part builds up to its ultimate shape. A technician then removes any artifacts of the manufacturing process by hand. After thorough cleaning, steel shot blasting, polishing, and sophisticated surface treatment, the housing assumes its final, extremely durable form.