Field Test · Studio Gear Review
Superlux HD-681 F
An in-depth technical assessment of Superlux’s semi-open monitoring headphones
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Spec Sheet
- Optimised for neutral playback
- Semi-open
- Circumaural
- Dynamic
- With self-adjusting headband for a good comfort
- SPL: 98 dB
- Impedance: 32 Ω
- Frequency range: 10 / 30,000 Hz
- Power consumption: 300 mW
- 2.5 m cable with 3.5 mm stereo jack
- Weight with cable: 275 g
- Weight without cable: 230 g
- Incl. adapter to 6.3 mm stereo jack and carrying bag
Studio Log
| Available since | March 2010 |
|---|---|
| Item number | 240433 |
| Sales Unit | 1 piece(s) |
| Design | Over-Ear |
| System | Semi Open |
| Impedance | 32 Ohms |
| Frequency range | 10 Hz – 30000 Hz |
| Adaptor | Yes |
| Replaceable Cable | No |
| Colour | Black |
| Max. SPL | 98 dB |
| Type Of Connector | Mini Jack |
| Weight | 230 g |
Demo Footage
Field Photography
QC Pass — Field Test
Customer Review Summary
[META]Examining the Superlux HD-681 F headphones’ audio precision, build quality, and comfort for affordable home studio monitoring.Introduction to the Superlux HD-681 F
The Superlux HD-681 F, launched in 2010, remains a prominent choice in the budget headphone market, particularly for home studio users. Priced around £26, these semi-open, circumaural headphones aim to deliver neutral and detailed playback without the premium cost. This review assesses their sound characteristics, build quality, ergonomics, and suitability for professional and casual applications.
Design and Build
These over-ear headphones feature a semi-open design with a self-adjusting headband, contributing to lightweight wear comfort. They weigh approximately 230 grams without cable, and 275 grams including the 2.5-metre fixed cable terminating in a 3.5 mm mini jack. An adaptor for 6.3 mm stereo jack is included, along with a carrying bag.
The materials used are predominantly plastic with synthetic leather pads. While this aids in keeping costs low and the weight down, some users note the pads can become warm and slightly sticky during extended use. The seal is not entirely circumaural for larger ears, as the pads rest against the ear edges rather than fully enclosing them, impacting isolation.
A notable drawback is the non-replaceable cable, which can hinder longevity; once damaged, the entire headphone requires replacement or professional repair. However, the robust metal frame underneath the plastics offers reasonable durability considering the price.
Sound Quality and Performance
The HD-681 F prides itself on delivering a neutral, flat sound signature, optimised for analytical listening and mixing rather than bass-heavy enjoyment. The measured impedance is 32 Ω with a broad frequency response spanning 10 Hz to 30 kHz, enabling reproduction well beyond the audible spectrum, advantageous for detailed audio work.
Initial impressions reveal slightly sharp high frequencies around 8 to 10 kHz that some listeners may find fatiguing. However, this can be alleviated with minor modifications like adding foam beneath the pads, which tempers the treble peak and results in a more natural timbre.
The bass response is notably restrained compared to other variants such as the HD-681 B, maintaining clarity and control without overwhelming the mids. This enhances midrange articulation, crucial for vocals and guitars during mixing. Bass frequencies are well defined, though not emphasized, extending down to about 35 Hz with acceptable speed and separation.
The soundstage is open and spacious, a benefit of the semi-open design, providing effective stereo imaging and instrument placement. While not suitable for environments requiring strict noise isolation, this openness allows users to be partly aware of their surroundings, beneficial during live sessions.
Comparison with Notable Alternatives
- Sennheiser HD280 and HD25 II: Both are closed headphones with greater isolation but less natural openness and comfort for long sessions.
- Audio-Technica AD7000: Offers a similar open sound profile but at a significantly higher price, with superior comfort and build.
- Superlux HD-681 (standard version): Emphasises stronger bass and loses some midrange detail, making the F model more suitable for neutral monitoring.
Comfort and Ergonomics
The headphones provide a relatively light fit, with the adjustable headband accommodating various head sizes. The synthetic leather earpads initially feel firm but soften with time. Some users report slight discomfort after extended use mainly due to heat build-up and pad material. Replacement velour pads are available and can improve comfort significantly.
Despite its budget construction, the HD-681 F manages to offer acceptable long-session wearability, though professional users might prefer a higher-grade model for intensive daily use.
Use Cases and Suitability
Given their neutral tuning and flat response, these headphones excel in home studio monitoring, audio mixing, and detailed listening. They enable an accurate representation of audio without adding artificial colouration. However, the semi-open design and limited isolation make them less ideal for tracking in noisy environments or recording vocals where bleed is a concern.
The lack of cable replacement is a limitation for heavier usage; therefore, these are best suited as a secondary or budget-conscious option rather than a primary professional headphone.
Summary and Verdict
The Superlux HD-681 F is a remarkable low-cost headphone offering a clear, balanced sound profile, well suited for home studio applications and critical listening when paired with a quality audio interface. While the build is evidently economical with synthetic materials and fixed cables, the sound drivers outperform expectations and offer ample detail across frequencies.
The notable treble peak requires either acclimatisation or simple modification but does not detract significantly from the overall value. Comfort is acceptable for extended sessions, especially with optional pad replacements.
For those needing neutral sound reproduction under £30, the HD-681 F is a highly recommended choice. It outperforms many competitors at this price level, providing a flat and revealing sound that facilitates mixing and editing tasks without taxing the ears excessively.
