Field Test · Studio Gear Review
Superlux HD-681AIR
In-depth technical analysis of Superlux HD-681AIR by Superlux brand
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Spec Sheet
- Dynamic
- Circumaural
- Semi-open back
- Sound pressure level: 98 dB
- Impedance: 32 ohm
- Frequency range: 10 – 30,000 Hz
- Power consumption: 300 mW
- THD 100 mW@1KHZ<1%
- Self-adjusting headband, very comfortable to wear
- Air ear cushions
- 2.5 m cable
- 3.5 mm Stereo jack
- Weight: 320 g
- Includes travel bag and adapter for 6.3 mm stereo jack
Studio Log
| Available since | August 2025 |
|---|---|
| Item number | 616998 |
| Sales Unit | 1 piece(s) |
| Design | Over-Ear |
| System | Semi Open |
| Impedance | 32 Ohms |
| Frequency range | 10 Hz – 30000 Hz |
| Adapter | Yes |
| Replacable Cable | No |
| Colour | Black |
| Sensitivity | 98 dB |
| Max. SPL | 98 dB |
| Type Of Connector | Mini Jack |
| Type Of connector | Mini Jack |
| Adaptor | Yes |
| Weight | 230 g |
| Marrone/Argento | Black |
Demo Footage
Field Photography
QC Pass — Field Test
Customer Review Summary
Overview of the Superlux HD-681AIR
The Superlux HD-681AIR headphones represent an evolution of the original HD-681 model, maintaining the essential audio characteristics while introducing a notable change in ear cushion design. Priced at £26 and available since August 2025, these over-ear, semi-open headphones cater to budget-conscious users seeking reasonable sound performance and comfort. The package includes a 3.5 mm mini jack connector, a 6.3 mm adapter, and a travel bag.
Design and Comfort
Constructed with a circumaural fit, the HD-681AIR feature air-filled ear cushions, intended to improve user comfort during extended listening sessions. The headphones weigh approximately 320 g, slightly heavier than some models, but maintain a self-adjusting headband that adapts well to different head sizes. The black finish offers a discreet aesthetic suited for various environments.
However, the semi-open back design, while beneficial for soundstage and ventilation, is less effective at isolating sound from external noise. Users should consider the trade-off between ambient sound bleed and a more natural listening experience.
Ear Cushion Replacement Challenges
The primary distinction of the HD-681AIR lies in the so-called “Air” ear pads supplied unassembled. These cushions, made from extremely soft rubber, promise enhanced comfort compared to the original model’s pads. In practice, fitting these replacement cushions proves difficult due to the lack of any mounting instructions.
- The Air cushions come pre-attached to a plastic ring that must be removed and then stretched over the headphone drivers’ casing.
- The process is fiddly and can lead to distortion of the cushion shape, risking improper sealing and reduced comfort.
- Absence of guidance or instructional materials complicates the assembly, potentially discouraging less patient users.
This cumbersome retrofit appears to be a cost-saving decision, detracting from the user experience and demanding a degree of perseverance to install correctly.
Sound Quality Assessment
Audio performance aligns closely with the original HD-681 model. The frequency response spans a wide 10 Hz to 30,000 Hz, complementing the dynamic drivers and 32 Ohm impedance. Sensitivity rated at 98 dB means the headphones are sufficiently loud for portable devices without requiring excessive amplification.
Sound reproduction offers a robust bass presence that some users may find slightly overemphasised in the lower treble region. This tonal balance benefits musicians, such as pianists, who appreciate the depth and richness in the bass and mid frequencies. However, a slight refinement in bass could improve clarity for other genres.
Total Harmonic Distortion remains below 1% at 100 mW, indicating clean output at moderate volumes. The semi-open design contributes to a spacious soundstage, enhancing the listening detail but with the expected compromise in isolation.
Acoustic Limitations
- The headphone headband exhibits vibrational noise when coming into contact with objects. This manifests as a low-frequency hum, often around a deep ‘d’ sound.
- Lack of gummed or rubberised padding on the yokes allows mechanical resonance, which detracts from an otherwise solid build.
Cable and Connectivity
The fixed 2.5-metre cable terminates in a mini stereo jack (3.5 mm), suitable for most modern audio devices. The inclusion of a 6.3 mm adapter adds compatibility with professional audio equipment. However, the cable is non-replaceable, which may affect longevity if damaged.
Value for Money and Final Thoughts
At £26, the Superlux HD-681AIR presents a compelling package with sonic qualities befitting more expensive models. The headphone delivers dependable sound performance for music listening and practice without disturbing others. Its comfort level is respectable, although the replacement ear cushions pose installation difficulties undermining the overall experience.
If one is prepared to invest effort in fitting the “Air” pads and can tolerate minor quirks such as cable non-replaceability and headband resonance, the HD-681AIR offers satisfactory value. The brand’s decision not to pre-assemble the alternative pads appears to be a cost-saving measure that somewhat diminishes convenience.
In comparison to the original HD-681, the AIR variant introduces a worthwhile alternative for those prioritising comfort but does not overcome all shortcomings. Budget users will find it hard to identify a better semi-open headphone that balances sound quality and price as effectively.
