HEDD Audio HEDDphone ONE Headphones

Full-range Air Motion Transformer technology with an open-back design and 42-ohm impedance

Designed and assembled in Berlin, the HEDDphone brings HEDD’s approach to studio monitoring to an Air Motion Transformer headphone. Its full-range AMT driver uses a folded diaphragm and HEDD’s Variable Velocity Transformation (VVT) technology to reproduce frequencies from 10 Hz to 40 kHz.

The diaphragm’s construction addresses a familiar limitation: conventional AMT drivers are typically used for high frequencies. HEDD extends this operating range by varying the folds in width and depth. Rather than moving as a flat surface, the folded Kapton diaphragm squeezes air between its folds. According to HEDD, this approach supports fast transient response and accurate reproduction across the audible spectrum.

Comfort and Amplifier Matching

The open-back, over-ear design pairs soft vegan ear pads with an adjustable headband and a weight of 1.61 lb. A sensitivity of 87 dB at 1 mW makes a capable desktop headphone amplifier an appropriate partner. A detachable cable connects to both earcups through locking mini-XLR connectors, while replaceable ear pads support long-term ownership.

Features

• Full-range Air Motion Transformer driver
• Variable Velocity Transformation technology with folds of varying width and depth
• Open-back, circumaural design
• Soft vegan ear pads
• Detachable cable and replaceable ear pads
• Designed and assembled in Berlin

Included Accessories

• 2.2 m headphone cable with a 6.35 mm source plug and dual mini-XLR headphone connectors

Specifications

Design: Open-back, over-ear

Driver Type: Air Motion Transformer with full-range Variable Velocity Transformation technology

Frequency Range: 10 Hz–40 kHz

Sensitivity (At 1 mW): 87 dB SPL

Impedance: 42 ohms

Ear Pads: Vegan synthetic leather

Headphone Connections: Dual mini-XLR

Cable: Detachable, 2.2 m; 6.35 mm plug

Weight: 1.61 lb. (0.73 kg)