Field Test · Studio Gear Review
Sennheiser HD 620S
In-depth technical appraisal of Sennheiser’s HD 620S over-ear headphones
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- Over-Ear Headphones
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Spec Sheet
- Wired headphones
- Circumaural
- Closed-back design
- Dynamic
- Frequency range: 6 – 30,000 Hz
- Impedance: 150 Ohm
- Sound pressure level: 105 dB SPL/1kHz/1Vrms
- Driver size: 42 mm
- Distortion factor: < 0.05% (1 kHz, 90 dB SPL
- Slightly angled transducers for a wider sound stage
- Artificial leather ear pads
- Detachable, smooth and single-sided 1.8 m cable
- Connection: 3.5 mm stereo mini jack
- Weight: 326 g
- Colour: Black
- Stereo-Adapter from 3.5 mm to 6.3 mm jack
Studio Log
| Available since | June 2024 |
|---|---|
| Item number | 587750 |
| Sales Unit | 1 piece(s) |
| Design | Over-Ear |
| System | CLosed Back |
| Impedance | 150 Ohms |
| Frequency range | 6 Hz – 30000 Hz |
| Adapter | Yes |
| Replacable Cable | Yes |
| Marrone/Argento | Black |
| Max. SPL | 105 dB |
| Sensitivity | 105 dB |
| Type Of Connector | Jack, mini-jack |
| Adaptor | Yes |
| Weight | 326 g |
| Replaceable Cable | Yes |
| Colour | Black |
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QC Pass — Field Test
Customer Review Summary
Introduction
The Sennheiser HD 620S, launched in June 2024, aim to provide an elevated closed-back headphone experience. Priced at £237, these wired circumaural headphones present a 150 Ohm impedance and a broad frequency response ranging from 6 Hz to 30,000 Hz. Built with 42 mm dynamic drivers housed in a black over-ear design, they weigh 326 g and come with a detachable, single-sided cable featuring a 3.5 mm stereo mini-jack connector. Among the design details is a slightly angled transducer placement that attempts to enhance spatial presentation within the confines of a closed-back system.
Design and Build Quality
The HD 620S are solidly constructed, employing a mix of metal and various plastics to balance durability with weight. The headphones incorporate artificial leather ear pads which offer a tight seal around the ears, crucial for isolation in a closed-back headphone. Despite the relatively firm clamping force designed to maintain this seal, some users with larger head sizes report discomfort after extended use, citing pressure and heat buildup on the ears within 30 minutes. The ear pads are replaceable, a practical feature for longevity and hygiene.
The cable is detachable and left-sided only, measuring 1.8 metres. It locks into the ear cup via a proprietary bayonet-style system which prevents accidental unplugging but limits compatibility with third-party replacement cables to those sourced from Sennheiser.
Sound Quality
The HD 620S deliver a sound profile that can be described as neutral and balanced, avoiding exaggerated bass or treble frequencies. The soundstage is notably wider than typical closed-back headphones, aided by the angled transducers. This broad spatial presentation allows improved layer separation and definition, making musical details more discernible. The frequency response extends well beyond the audible range, down to 6 Hz and up to 30 kHz, ensuring a full-bodied reproduction of lows, mids and highs without distortion, quoted at less than 0.05% at 1 kHz and 90 dB SPL.
Several listeners highlight a relaxed and smooth tonal balance, which helps reduce listening fatigue over longer sessions. The headphones excel at clean, precise presentation, but may lack the “wow” factor or impactful punch that some other models provide. This subtle, laid-back sound signature is preferred by audiophiles who value accuracy and space over coloured tonalities.
Practical Use and Isolation
The closed-back design offers effective sound isolation, preventing audio leakage that can disturb others. Users report that the HD 620S are suitable for late-night listening without causing annoyance to nearby individuals. Nonetheless, the ear pads can cause mild heat buildup during prolonged use due to their artificial leather finish, which is a common compromise in this headphone category.
Thanks to the 150 Ohm impedance and 105 dB sensitivity, these headphones can be driven by a broad range of sources, including portable players and desktop amplifiers. They come with a 3.5 mm to 6.3 mm stereo adapter, increasing compatibility with professional audio gear.
Comparisons and Positioning
Within the competitive £200-£250 range, the HD 620S hold their own against notable rivals such as Beyerdynamic’s DT 700 Pro X and Yamaha’s HPH MT8. While the Beyerdynamics offer better comfort for larger heads due to superior pressure distribution and mohair pads, the Sennheisers are commended for their more neutral and less fatiguing sound.
The headphones are often compared to the classic HD 650. The HD 620S provide a similar tonal balance but with a closed-back configuration that appeals to those needing isolation. Listeners who prefer a relaxed high end and spacious soundstage may find these headphones better suited for extended listening than some brighter, more aggressive alternatives.
Drawbacks
- Firm clamping pressure can cause discomfort for users with larger heads.
- Artificial leather pads may induce warmth and mild sweating during lengthy sessions.
- Proprietary cable connection restricts easy replacement and customisation to official cables only.
- Cable transmits mechanical noise more noticeably than some competitors.
Conclusion
The Sennheiser HD 620S are a thoughtfully engineered closed-back headphone option that successfully combine broad frequency coverage, a neutral sound signature, and practical features such as replaceable cables and adapters at a reasonable price point. While they may not suit all head sizes comfortably and have minor issues with ear pad heat and cable noise, they excel in delivering an insightful, precise listening experience with low fatigue. These qualities make them well-suited for studio monitoring, home hi-fi use, and private listening sessions where sound leakage must be minimised. Their design and sonic characteristics uphold Sennheiser’s reputation while aiming to meet the demands of detail-focused audiophiles operating in noisy or shared environments.
