HeadphoneOverreview

HEDD Audio HEDDphone TWO

The only full-range Air Motion Transformer headphone, rebuilt lighter and retuned for the studio — rich mids and rare low-level detail to most ears, lean, oddly voiced and clampy to others, and divisive on almost everything else.

57 sourcesUpdated
$1,999Typical US price

Score aggregates reviewer opinions across topics.

View product
HEDD Audio HEDDphone TWO

The short version

What to know.

The HEDDphone TWO is a 550 g open-back with a full-range AMT driver, voiced flatter and more mid-forward than the original. Measurements agree on its shape: sub-bass rolling off below about 50 Hz (at 20 Hz still above an HD 600 on most rigs), a full, slightly forward midrange, 2–8 kHz several dB below neutral, and a rise above 10 kHz whose size depends on the rig. The midrange and vocal timbre are its most consistently praised quality. Most reviewers also call it unusually resolving at low levels, with fine micro-dynamics. It needs a strong amp, about a watt, and reviewers and owners alike say its stage, punch and resolution change a lot with the amp. Almost everything else splits sources close to evenly. Bass reads as tight and textured to half of them and lean, lacking slam, to the other half. Treble is smooth to some, dark to others and bright or sibilant on top to a third group. The tuning is either a neutral studio reference or an odd, EQ-hungry mix of warm and bright. The stage is speaker-like to some and narrow to others. The HEDDband is a comfort breakthrough for many heads and a clamp that won't loosen enough for others. And $2,000 is fair for some reviewers and hard to justify for others.

About this product

The second-generation HEDDphone (2023), not the 2020 original (now called HEDDphone ONE), the TWO GT (2024: retuned, with velour and leather pads) or the dynamic-driver HEDDphone D1. Also sold without cables as the cheaper TWO 'UNPLUGGED' — the same headphone.

HEDD Audio is a Berlin speaker maker founded in 2015 by physicist Klaus Heinz — the engineer behind ADAM Audio's AMT tweeters — and his son Frederik Knop. Its HEDDphone of 2020 was the first headphone built around a full-range Air Motion Transformer: a pleated Kapton diaphragm that squeezes air out of its folds rather than pushing it like a piston. It was widely admired for its sound and widely disliked on the head, at over 700 g.

The HEDDphone TWO (2023, $1,999) is the answer to that: a new, lighter driver, magnesium cups, a carbon-fibre arc and a 'HEDDband' suspension whose second strap sets the clamp, for 550 g in all — and a flatter, more mid-focused tuning aimed at mixing and mastering. Reviewers agree on what changed. Almost everything about whether it worked is argued, from the bass and treble to the stage, the fit and the price.

A good fit for

  • Mixing and mastering engineers who want a mid-focused, revealing reference that doesn't exaggerate the lows
  • Listeners who prioritise vocal and instrument timbre and low-level texture over bass slam
  • Anyone curious about AMT drivers who has a powerful, clean amp (roughly 1 W at 40 Ω)
  • Treble-sensitive listeners — at least those who find the 2–8 kHz recession smooth rather than dark

Think twice if

  • You want deep, rumbling sub-bass or big-drum slam without EQ
  • You won't use EQ and dislike a mid-centric or dark-leaning presence region
  • You have a wide head or are sensitive to clamp — try one on first
  • You're driving it from a modest dongle or portable amp
  • You want a huge, deep soundstage like an HD 800 S

The reviewer consensus

Agreement &
disagreement.

10 / 11topics divide opinion
1 Mostly agree10 Divided opinions

Common ground5

  • The midrange and vocal timbre are its most consistently praised quality — full, natural and slightly forward.
  • Measurements agree on the shape: sub-bass rolling off below about 50 Hz, a recessed 2–8 kHz, and a lifted top octave.
  • It needs a strong amplifier (HEDD recommends at least 1 W), and several reviewers and owners say its stage, punch and resolution change a lot with the amp.

Points of contention8

  • Bass: tight, textured and extended enough vs lean in the sub-bass and short on slam (49/51).
  • Treble: smooth and non-fatiguing vs dark and missing air vs bright or sibilant on top (49/31/20) — different octaves of one curve.
  • Tonality: a neutral, mid-focused studio balance vs an odd, EQ-hungry 'warm and bright' voicing — split roughly evenly.

A closer listen.

11 topics · 10 divided
Left: criticalRight: positiveTighter lines: more agreement

Bass

No overall leanDivided opinions
Reviewer sentiment25 supporting sources
CriticalNeutralPositive

Band: opinion spread · Dot: weighted average

Sources split almost exactly in half. One side hears tight, fast, textured bass that extends further than most dynamic headphones and hits with more body than the graph suggests. The other side hears the sub-bass roll-off and a lack of slam, and reaches for EQ. The graphs support both: the TWO has more deep bass than an HD 600 but sits well below the Harman target and a flat planar, and it has less bass than the original HEDDphone.

Measured

oratory1990's GRAS file sits 7.9 dB under the Harman over-ear target at 20 Hz and 5.8 dB under at 50 Hz, yet 3.3 dB above his HD 600 at 20 Hz; VSG's and GadgetryTech's rigs put it 4–5 dB above their HD 6XX at 20 Hz. headphones.com's B&K 5128 shows the roll-off starting around 40–60 Hz and reaching about −6 dB at 20 Hz. Against the original HEDDphone on the same rig (three rigs), everything below 200 Hz is 2–4.7 dB lower. Tape Op measured less ringing and distortion than the original, especially below 100 Hz.

vs. listeners — Both camps are describing one curve. It reaches lower than most dynamic open-backs but not as low as a flat planar, and 'lean' and 'well extended' are the same response judged against different references. HEDD's co-founder acknowledged the split in public: some listeners 'would love more weight / body' down low.

Where it splits
Tight, textured and well extended — more body than the graph suggests; no EQ needed.49%

“there’s an additional richness to the TWOs that somehow connects the bass to the low midrange more naturally, without ever sounding overblown or exaggerated”

Sound On Sound (Sam Inglis)
Lean in the deepest octave and short on slam — wants a bass shelf.51%

“You still will not find the HEDDphone Two imbued with huge amounts of sub-bass rumble.”

Headfonics (Marcus)
Link to this topic

The hardware

Specifications.

Checked

Design

Type
Open-back over-ear
Drivers
1 × AMT (VVT technology, Kapton polyimide diaphragm)

Electrical

Impedance
41 Ω
Sensitivity
89 dB/mW≈ 102.9 dB/V
Frequency response
10 Hz – 40 kHz

Connection

Cable
Detachable, dual-entry, 2.2 mcommunity-sourced: cable entry
Connector
3.5 mm
Plugs supplied
6.35 mm, 4.4 mm balanced

Physical

Weight
550 g
Released
2023

Manufacturer-published figures, not measurements · from hedd.audio. Cable entry not published by the maker — community-sourced from hands-on reviews: headphones.com, headfonics.com, techpowerup.com.

Follow the evidence

Sources 57

1–6 of 57 sources

Read with context

Limitations & method.

As of

What to keep in mind 6

  1. A read of where the reviews and owners land as of October 2026, three years after launch — HEDD has since added the retuned TWO GT and the cheaper D1, which change the value question.

  2. This headphone changes a lot with the amplifier. Many of the disagreements about bass, soundstage and detail trace back to what reviewers drove it with, so hear it on an amp like yours if you can.

Where to buy Product & retailer links