HEDD HEDDphone One
Headphones
- Open design
- Over-ear design with Air Motion Transformer driver (electrodynamic converter)
- Power: 87 dB / 1mW
- Impedance: 42 Ohm
- Frequency range: 10 - 40,000 Hz
- Weight: 718 g
- Includes 2.2 m cable with 6.3 mm jack plug / 4-pin Mini-XLR
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Available since February 2020
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Item number 484990
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Sales Unit 1 piece(s)
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Design Over-Ear
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System Open
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Impedance 42 Ohms
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Frequency range 10 Hz – 40000 Hz
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Adapter Yes
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Replacable Cable Yes
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Marrone/Argento Black
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Sensitivity 87 dB
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Type Of Connector Jack(stereo)
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Weight 718 g
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Replaceable Cable Yes
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Colour Black
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Full-range AMT headphones
The HEDDphone One is among the first headphones to use an Air Motion Transformer as a full-range driver, placing AMT alongside dynamic, planar magnetic, and electrostatic designs as a fourth recognised approach. The AMT principle – developed by Oskar Heil and refined for studio monitor use by Klaus Heinz, who founded HEDD – has been a familiar high-frequency driver in monitor tweeters for decades. Adapting it to cover the full audible range in a headphone is a different proposition, and the engineering work needed to get there sits at the centre of this product. The HEDDphone One is open-back, built for studio use, and ships with a dual-sided HPC1 cable using four-pin mini-XLR connectors at the earcups and a 6.3mm jack at the source end.
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How the AMT moves air
A conventional dynamic driver pushes a flat diaphragm forward and back to displace air. The AMT instead uses a pleated, bellows-shaped diaphragm: The folds squeeze together and expand, forcing air out from between them at several times the speed of the diaphragm's own movement. This larger effective surface area within a compact housing means each fold travels only a short distance. At any given frequency, this helps keep distortion low across the band. HEDD's Variable Velocity Transformation tunes the fold geometry along the diaphragm so that low frequencies, midrange, and treble all behave linearly from a single driver – removing the need for a crossover or separate transducers. Like most high-impedance, low-sensitivity studio headphones, the HEDDphone One requires a capable mains-powered headphone amplifier to perform at its best.
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Revealing, not brutal
The HEDDphone One is aimed at mixing and mastering engineers who need a monitoring tool that surfaces problems without exaggerating them. Bass imbalances, sibilance, compression artefacts, level relationships between elements, and the texture of reverb tails all register clearly – but the presentation stays listenable across long sessions, which matters when listening is the work. The oversized earcups position the drivers further from the ear than most headphones, contributing to a more speaker-like sense of depth and image that makes level and dynamics judgements easier to trust. The open-back construction is integral to that character and rules the HEDDphone One out for tracking or any environment where isolation matters. For engineers wanting similar AMT performance in a lighter, more ergonomic package, the HEDDphone Two is the natural alternative.
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About HEDD
The family-owned company HEDD Audio was founded in 2015 in Berlin, where it still manufactures its high-quality studio monitors, subwoofers, and hi-fi speakers, as well as headphones – or HEDDphones. The name HEDD stands for Heinz ElectroDynamic Design, after its founder Klaus Heinz (who also founded ADAM Audio); his son, who himself has a PhD in musicology, is now CEO. The company’s R&D work is based on their decades of experience, and its mission is to deliver outstandingly detailed sound and optimum signal quality. A whole host of renowned DJs and mastering engineers, including DJ Jazzy Jeff and Sascha "Busy" Bühren, swear by HEDD products for their day-to-day work.
Size, weight, and commitment
At 718g with large rectangular earcups, the HEDDphone One is among the largest and heaviest studio headphones available. The deep, soft pads make extended sessions manageable, but this is not a headphone that disappears in use – it asks for a dedicated listening environment and a capable amplifier to perform at its best. There is no carry case in the box; transport requires care. For engineers willing to make that commitment, the HEDDphone One delivers a monitoring reference that holds up reliably next to high-end speaker systems.
