Hedd HEDDphone ONE

HEDDphone ONE: HEDD's AMT, from monitors to reference headphones

Founded in Berlin in 2015 by Klaus Heinz and Dr. Frederik Knop, HEDD (Heinz ElectroDynamic Designs) first made its mark in studio monitoring with its AMT tweeters. With the HEDDphone ONE, the brand transposes this technological signature into a headphone format, aiming for reference listening for professionals as well as demanding audiophiles. This "full-range AMT" approach stands out from dynamic, planar, or electrostatic drivers by delivering a reproduction focused on speed, micro-dynamics, and airiness.

An open-back headphone for mixing, mastering, and critical analysis

The HEDDphone ONE targets sound engineers, producers, and creators who want to hear details without artifices: reverb placement, depth of layers, treble balance, transient texture, attack precision. Its open design promotes long listening sessions, with a spacious soundstage and a sense of space close to speaker listening.

With an efficiency of 87 dB SPL at 1 mW, it reveals its full potential with a solid headphone amplifier: ideally plan for an amp capable of delivering at least 1 W at 32 ohms to maintain impact, headroom, and control in the bass.

AMT + VVT: transient speed, treble extension, realism

At the heart of the HEDDphone ONE is an AMT driver based on a pleated Kapton diaphragm placed in a magnetic field. The principle: air is sucked and compressed through each fold, which accelerates air movement and improves responsiveness. The result: a sensation of precision and clarity particularly useful for judging compression, de-essing, or the brightness of a voice without artificial harshness.

VVT: a more homogeneous response across the entire band

To achieve a smoother curve across the spectrum, HEDD refined the AMT architecture with specific geometries and a system of variable-sized folds, called Variable Velocity Transformation. This optimization contributes to coherent listening, with high definition, natural timbre, and stable spatialization.

Symmetrical connectivity and premium comfort

The 4-pin symmetrical mini-XLR connection meets the standards of high-end studio setups. The ear pads made from premium vegan materials combine softness and durability for extended sessions while maintaining good stability on the head.

Technical specifications

Frequency response - start	10 Hz	Design	open
Frequency response - end	40 kHz	Impedance	42 Ω
Format	circumaural	Color	Black
Power handling	1 MILLIWATT

Type	open-back over-ear headphones	Amplification recommendation	at least 1 W at 32 ohms
Technology	HEDD AMT with VVT (Variable Velocity Transformation)	Ear pads	premium vegan materials, soft and durable
Frequency response	10 Hz - 40,000 Hz	Weight	718 g
Efficiency	87 dB SPL at 1 mW	Manufacturing	hand-assembled in Berlin, Germany
Connection	4-pin symmetrical mini-XLR