Reference Series · Est. 2014

Hear the whole room.

A closed-back reference headphone built around a 40mm beryllium-coated driver, hand-assembled in Copenhagen. Nothing added. Nothing left out.

Explore the range The engineering →

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Model 03 — Aperture
40mm Be · 300Ω · 8Hz–40kHz

Silver and tan leather HELM headphones, warm premium finish, photographed at an angle

The philosophy

Sound the way the artist last heard it.

Most headphones flatter the recording. Ours refuse to. We voice every HELM against the master reference monitors used in mastering rooms — so what reaches your ear is the mix as it was signed off, not a marketing curve tuned for the showroom floor.

The result is unnervingly honest. A resolving midrange that never editorialises, bass with texture instead of bulk, and a treble that extends to 40kHz without ever turning brittle. You stop hearing the headphone. You start hearing the room it was recorded in.

Voiced by the HELM acoustic team, Copenhagen

The range

Eight instruments,
one signature.

Drag to rotate the cylinder, or step through each model. Every HELM shares the same driver DNA — tuned for a different room, a different listener, a different hour of the night.

01Meridian

Black HELM headphones photographed top-down on dark, symmetric

02Axis

Black HELM headphones on cream backdrop, dramatic lighting

03Aperture

Black over-ear HELM headphones on a white desk

04Atelier

Small black on-ear HELM headphones on white with long shadow

05Transit

Black HELM headphones in close moody dark lighting

06Nocturne

HELM open-back headphones resting on a floor with warm bokeh

07Solace

HELM audiophile headphones resting on warm wood surface

08Cantor

Model 01 — Meridian

40mm Beryllium · Closed-Back · 32Ω

From €540

Flagship lineup

Choose your reference.

Silver and tan leather HELM headphones, warm premium finish, photographed close

Meridian

€540

40mm Be · Closed · 32Ω
8Hz–40kHz

HELM open-back headphones resting on a surface with warm bokeh behind

Aperture

€620

40mm Be · Open · 300Ω
6Hz–44kHz

HELM headphones with silver cups and brown leather resting against a warm backdrop

Solace

€780

45mm Be · Open · 250Ω
5Hz–46kHz

HELM headphones photographed top-down on a warm wood surface

Nocturne

€590

40mm Be · Closed · 38Ω
8Hz–40kHz

40mm

Beryllium driver

8–40kHz

Frequency response

300Ω

Nominal impedance

96h

Bench-burned & measured

Brown leather HELM headphones against a deep red backdrop, warm macro detail of materials

Materials & assembly

Made by hand, made to outlast trend.

Every yoke is milled from a single billet of aerospace aluminium, anodised in a champagne tone that deepens with wear. Earpads are cut from full-grain Scandinavian leather and lambswool, stitched by hand and designed to be replaced — never discarded.

Frame 6063-T6 aluminium, single-billet CNC, champagne anodised
Cushioning Full-grain leather over memory-lambswool, hand-stitched
Assembly One technician, start to finish, signed and serialised
Warranty Ten years, parts and re-voicing included

Black HELM headphones in a flat-lay on a bright yellow background

Limited · Studio Editions

Reference doesn't have to be quiet.

Meet the Studio Editions — the same reference engine, dressed in colourways drawn from the mastering desks we grew up around. Numbered runs of 300. Once they're gone, they're archive.

Join the waitlist

We build the headphone to disappear.

— The HELM Manifesto, Paragraph One

The Reserve List

Join the Reserve list.

Early access to limited runs, invitations to private listening sessions, and the occasional note from the workshop. No noise — we only send what's worth hearing.