Field Test · Studio Gear Review
Superlux HD-667
Technical assessment of Superlux’s closed-back over-ear HD-667 headset
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Spec Sheet
- Circumaural
- Closed-back design
- Dynamic
- 40 mm Neodymium driver
- Frequency response: 10 – 20.000 Hz
- Impedance: 32 Ohm
- Sound pressure level: 102 dB
- Maximum power rating: 200 mW
- Artificial leather ear pads
- Detachable, single-ended, straight 2 m cable with 3.5 mm mini jack
- Weight (without cable): 335 g
- Colour: Black
- Includes bag and adapter to 6.3 mm stereo jack
Studio Log
| Available since | August 2025 |
|---|---|
| Item number | 609977 |
| Sales Unit | 1 piece(s) |
| Design | Over-Ear |
| System | Closed Back |
| Impedance | 32 Ohms |
| Frequency range | 10 Hz – 20000 Hz |
| Adaptor | Yes |
| Replaceable Cable | Yes |
| Colour | Black |
| Max. SPL | 102 dB |
| Sensitivity | 102 dB |
| Type Of Connector | Mini Jack |
| Type Of connector | Mini Jack |
| Adapter | Yes |
| Weight | 335 g |
| Replacable Cable | Yes |
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QC Pass — Field Test
Customer Review Summary
Introduction
The Superlux HD-667 is a closed-back, over-ear headphone launched in August 2025. Positioned at an accessible price of £34, this model aims to offer solid audio performance and durability in a budget segment. Its 40 mm neodymium drivers and 32 Ohms impedance suggest a device suited for both casual listening and certain professional applications.
Design and Build Quality
Weighing 335 grams without the cable, the HD-667 carries a substantial presence that feels robust rather than cumbersome. The closed-back design ensures effective isolation, which suits noisy environments, supported by artificial leather circumaural ear pads that provide comfort and sound sealing.
The headphones feature a detachable, single-ended straight 2-metre cable with a 3.5 mm mini jack, accompanied by a 6.3 mm adapter. The lockable cable connection is a welcome element of the build, reducing accidental disconnections during use. All plastic and metal parts appear well-assembled, giving an impression of durable construction. However, some users found the clamping force quite firm, which could impact long listening sessions.
Sound Characteristics
The HD-667 demonstrates a frequency response range from 10 Hz to 20,000 Hz, with a sensitivity and maximum sound pressure level both rated at 102 dB. This hardware configuration yields a sound profile rich in bass presence, which users report is more than satisfactory, with a dry, deep low end that carries weight without overpowering.
Mid frequencies are presented clearly and the highs maintain a pleasant, non-fatiguing character. Spatial reproduction is notably precise; instruments and vocals materialise with distinct timbres, preserving the nuances of various genres from classical, jazz to pop and rock.
While some listeners noted a slight imbalance initially and a need for burn-in time before the sound matured fully, the end result is a gratifying experience that defies the budget price point. The maximum power rating of 200 mW allows these headphones to reach ample volume levels without distortion.
Usability and Comfort
Despite its solid build, the HD-667’s clamping pressure is a factor for consideration. Extended use may cause discomfort, especially given the limited ventilation through the artificial leather earpads. Some users opted to modify the headband padding to alleviate pressure, reporting improved comfort and even a subjective enhancement of sound vividness.
The included cable is replaceable, which is important given the absence of compatibility with higher-quality third-party cables. This limitation detracts slightly from flexibility, but the supplied cable is sufficient for everyday use.
Accessories and Extras
The package includes a protective carrying bag and a 6.3 mm adapter, adding convenience for connection with audio equipment featuring larger jacks. These additions improve the overall value of the set and facilitate varied use cases.
Conclusion
The Superlux HD-667 headphones deliver an impressive performance for a modest investment. The sound quality, highlighted by a strong bass response and clear mids and highs, stands out in the budget category. The robust construction and useful accessories further underline their appeal.
Some compromises exist such as the firm clamping force and the restriction to the supplied cable for connectivity. Nonetheless, these headphones are a solid choice for users seeking effective noise isolation and a rich sound at an economical price.
Worth consideration for anyone prioritising sound quality and durability over extended comfort or premium design features.
