Field Test · Studio Gear Review
HEDD HEDDphone D1
HEDD’s D1 delivers a detailed, balanced sound with innovative TPCD drivers
HEDD
- HEDDphone D1
- HEDDphone D1
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Spec Sheet
- Over-ear
- Open-back design
- Dynamic drivers with Thin-Ply Carbon Diaphragm (TPCD), a high-strength composite material that controls resonance and enables fast transients without additional damping
- Developed in collaboration with Composite Sound (Sweden)
- Frequency range: 5 – 40.000 Hz
- Sensitivity: 100 dB @ 1mW
- Impedance: 32 Ohm
- Ear pads made of perforated velour
- Dual mono jack connections: 3.5 mm mini jack
- Weight: 350 g
- Includes 2.3 m cable, 6.3 mm adapter and carrying case
Studio Log
| Available since | November 2025 |
|---|---|
| Item number | 629277 |
| Sales Unit | 1 piece(s) |
| Design | Over-Ear |
| System | Open |
| Impedance | 32 Ohms |
| Frequency range | 5 Hz – 40000 Hz |
| Adaptor | Yes |
| Replaceable Cable | Yes |
| Colour | Black |
| Max. SPL | 100 dB |
| Sensitivity | 100 dB |
| Type Of Connector | Mini Jack (mono) |
| Adapter | Yes |
| Weight | 350 g |
| Replacable Cable | Yes |
| Marrone/Argento | Black |
Demo Footage
Field Photography
QC Pass — Field Test
Customer Review Summary
Introduction
The HEDD HEDDphone D1 is an over-ear, open-back headphone released in November 2025, positioned at the premium £615 price point. Known primarily for its distinctive drivers and engineering partnership with Composite Sound in Sweden, the D1 targets audiophiles and professionals seeking high-fidelity sound with a technical edge. Designed with a relatively low impedance of 32 ohms and a wide frequency response spanning 5 Hz to 40 kHz, it aims to deliver a robust and precise listening experience.
Design and Build Quality
The D1 sports an open system featuring dynamic drivers with Thin-Ply Carbon Diaphragm (TPCD) technology, a composite material engineered to regulate resonance and enhance transient response without relying on additional damping. This advanced driver design is a highlight, supporting the headphone’s ability to render sound with exceptional clarity and speed.
Structurally, the headphone weighs 350 grams, maintaining a balance between durability and comfort. The ear pads are crafted from perforated velour, a soft material that improves breathability but comes with the drawback of attracting dust and hair, as noted in real-world user feedback. The headband is covered in a suede-like fabric which also gathers particles, raising concerns about long-term wear and maintenance. Replacement of cable and earpads is possible, which adds to the longevity of the product.
The build includes a dual mini jack (3.5 mm) connection system for each earcup, which some users find inconvenient due to the cables getting tangled or the difficulty of removing the headphones from around the neck without two hands. The package includes a 2.3-metre cable, a 6.3 mm adapter, and a carrying case.
Sound Performance and Characteristics
Audio performance of the HEDDphone D1 is frequently praised for its rich detail, particularly in the midrange and bass regions. Vocals are described as natural and immersive, with a spacious soundstage that is ideal for home listening rather than portable or gaming use due to the open-back nature that lets in ambient noise.
Listeners report a balanced frequency response with a notable extension down to 5 Hz, offering deep, controlled bass that is firm yet never muddled. Highs are generally smooth, but some users mention a slight drop-off above 14 kHz, which may render the very top-end less vivid for certain music styles.
The headphone exhibits very precise imaging and transient response, which makes it well-suited to a broad range of genres, from orchestral and classical to rock and jazz. It is also noted for its dynamic capability and lack of distortion at moderate volume levels, reaching up to 100 dB SPL.
While the D1 sounds excellent directly from sources like Marantz CD players, Rotel amplifiers, and specialised headphone amplifiers including tube models, a mild EQ adjustment below 80 Hz can bring out even greater bass presence if desired.
Comparison and Market Position
Within its price bracket, the HEDDphone D1’s main competitors include studio-grade headphones like the Sennheiser HD 400 Pro and the legendary HD 600/HD 6XX series. Compared to the Sennheiser HD 400 Pro, which retails at under a third of the price, the D1 provides a somewhat warmer tonal balance with a wider stereo field, though some argue the Sennheiser offers superior neutrality and a better cable design.
In terms of neutrality and technical precision, the D1 aligns more with studio monitors but also brings a refined listening experience comparable to well-known high-end models. Some enthusiasts suggest that for pure music enjoyment, alternatives focusing on warmth or vocal prominence could be more gratifying.
Comfort and Ergonomics
Despite the concerns over the materials used in the headband and pads, the HEDDphone D1 is broadly regarded as comfortable for extended listening sessions lasting several hours. The clamp force is balanced, accommodating those sensitive to pressure, although the headband can create a hotspot which might require occasional adjustment or bending to alleviate discomfort.
Drawbacks and Considerations
Some users report a strong initial chemical smell from the pads and carrying case, which fades with airing but might be off-putting immediately after unboxing. The dual mono cable system can prove cumbersome in everyday use, particularly when seated with audio equipment positioned to one side. Additionally, microphonic noise from the cable during movement was observed, though not universally distracting.
Material choices for the ear pads and headband, while aesthetically pleasing initially, raise durability and cleanliness concerns due to dust attraction and wear over time. Replacement parts are available, but the headband’s fixed attachment limits adjustability.
Conclusion
The HEDDphone D1 stands out as a technically impressive headphone with innovative driver technology delivering excellent sound quality, notably in the midrange clarity and bass control. It suits audiophiles and professionals who value analytical listening and a wide frequency range within a moderately priced package.
Though some ergonomic and design choices may divide opinion, the overall performance justifies the investment for users seeking a dynamic, open-back headphone made with attention to repairability and sound precision. For those prioritising supreme comfort or budget-friendliness, alternatives like the Sennheiser HD 400 Pro remain worthy contenders.
