Handcrafted in California, USA.Planar Magnetic. Closed-Back. In-ear. Precision-milled Aluminum. Our new Euclid combines all of these features to deliver superior detail retrieval and sonic accuracy with a soundstage and dynamic range so robust you'll forget you're listening to a closed-back in-ear. The miniaturized 18mm single planar magnetic driver has no crossovers, resulting in superior cohesion across the entire frequency spectrum. Euclid is engineered for an incredible 105 dB/mW efficiency and a max SPL well over 120dB, giving it the highest dynamic range of any in-ear in its size category. The smoothly contoured light weight design incorporates precision-milled aluminum and carbon fiber for a look that doesn't sacrifice elegance for comfort.Patented 18mm Planar Magnetic Driver TechnologyEuclid's 18mm planar magnetic drivers incorporate AUDEZE's patented Fazor waveguides to eliminate the phasing and distortion typical of most closed-back dynamic in-ears. The efficient single driver design also includes our patented Fluxor magnets and Uniforce voice coils to further reduce distortion, improve sensitivity, and create superior coherency across the entire frequency spectrum.Universal ConnectivityEuclid's high sensitivity and low impedance make it an ideal companion to any high resolution audio player. The gold plated MMCX plug terminations ensure a secure and durable connection whether you're using the braided cable we've included or your own custom design.Precision-Milled Aluminum BodySmoothly contoured with an elegant matte black finish, Euclid's light-weight and durable body is precision-milled from solid aluminum and capped with a layer of carbon fiber.The Perfect FitTo give you the best fit with the best comfort, Euclid comes with 3 different styles of silicone and foam eartips including SpinFit and Comply models.Ergonomic DesignEuclid's small 5mm ear port, contoured design, and light-weight construction work together to create an ergonomic fit suitable to most inner-ear shapes. The braided cable is routed behind the ear for enhanced stability, eliminating the need for ear hooks and improving comfort over extended listening sessions.