HEDD Audio HEDDphone D1 Headphones

Thin-Ply Carbon Diaphragm technology with an open-back design and 32-ohm impedance

Designed and assembled in Berlin, the HEDDphone D1 brings HEDD’s approach to studio monitoring to a dynamic headphone. Developed with Sweden’s Composite Sound, its Thin-Ply Carbon Diaphragm (TPCD) uses ultra-thin carbon layers to combine low mass with carefully controlled stiffness.

The diaphragm’s construction addresses a familiar challenge: at certain frequencies, a driver can flex rather than move uniformly, introducing unwanted resonances. HEDD controls this behavior through the diaphragm’s shape, material distribution, and directional stiffness. According to HEDD, this structural approach eliminates the need for conventional damping layers at the diaphragm itself, supporting clean transients and accurate reproduction.

Comfort and Everyday Compatibility

The open-back, over-ear design pairs perforated velour ear pads with a weight of 0.77 lb. A 32-ohm impedance provides broad source compatibility, while a detachable, textile-covered cable connects to both earcups. Fully serviceable construction supports long-term ownership.

Features

• Custom dynamic driver with a Thin-Ply Carbon Diaphragm
• Structural resonance control through diaphragm engineering
• Open-back, circumaural design
• Perforated velour ear pads
• Detachable cable and fully serviceable construction
• Designed and assembled in Berlin

Included Accessories

• 2 m textile-covered cable with a 3.5 mm TRS source plug and dual 3.5 mm mono headphone connectors
• 6.35 mm adapter
• Custom carrying case

Specifications

Design: Open-back, over-ear

Driver Type: Dynamic with Thin-Ply Carbon Diaphragm

Frequency Range: 5 Hz–40 kHz

Sensitivity (At 1 mW): 100 dB

Impedance: 32 ohms

Ear Pads: Perforated velour

Headphone Connections: Dual 3.5 mm

Cable: Detachable, textile-covered, 2 m; 3.5 mm TRS plug with 6.35 mm adapter

Weight: 0.77 lb. (0.35 kg)