World’s first dynamic headphone with a Thin-Ply Carbon Diaphragm. A new HEDDphone® built for true listening, the D1 delivers the clarity, realism, and tonal integrity of a reference monitor. Every note feels balanced and immediate, details are revealed without fatigue, and the carefully engineered fit ensures lasting comfort for extended sessions. The D1 is the world’s first dynamic headphone with a Thin-Ply Carbon Diaphragm (TPCD). Developed with Swedish company Composite Sound, specialists in advanced audio diaphragms, the D1 combines HEDD’s 40 years of acoustic expertise with advanced material science. Built with precision, purpose, and material integrity, the HEDDphone® D1 delivers reference-grade accuracy and balance. Made for those who are serious about sound. Thin-Ply Carbon Diaphragm engineered for structural resonance controlUltra-fast and clean transientsCustom dynamic driver tuned for precision, speed, and tonal balanceOpen-back circumaural design delivers natural openness and spacious soundstageBroad source compatibility, scales with premium ampsLightweight and comfortable, perfect for extended listening sessionsIncludes dual 3.5 mm mono connectors; 6.35 mm adapter; and 1 premium textile-covered detachable cableCustom carry caseMade in Germany5 year warranty after registration