The Sennheiser HD 620S are higher-tier closed-back headphones that the manufacturer promises can supply a wide and immersive soundstage like open-back headphones without all the limitations of open-backs, like a lack of isolation and deep bass. Kitted out with creature comforts like thick padding and a cable that connects to one side, these appear to be aimed at enthusiasts rather than audio professionals. Their feature set and visual design share similarities with the enthusiast-oriented Sennheiser HD 560S. However, they're in the same line as the Sennheiser HD 600, which are venerable mixing headphones used by the pros. If nothing else, the HD 620S are already posed to break conventions and appeal to a niche audience, so let's see if they manage to synthesize the best parts of open-back and closed-back headphones.
Our Verdict
The Sennheiser HD 620S are passable for sports and fitness. While not the best pair of headphones to take to the gym, due to their bulky design, absence of an IP rating, and wired-only connection that can snag on equipment, they're still comfortable and well-made.
- Very comfortable.
- Well-built headphones.
- Not very portable.
- No water, sweat, or dust resistance.
The Sennheiser HD 620S are acceptable for travel use. They're wired-only headphones, so you don't need to worry about battery life, but you're limited in what you can plug into. Their plush cushioning is very comfortable for long periods, and they don't leak much noise into the space. They also playback your audio sounding fairly balanced, although that depends on your anatomy, because their frequency response consistency varies significantly between people. However, they also struggle to block out much environmental noise, so airplane ambient din and talkative passengers reach your ears unabated, though some high frequencies are tamed a bit.
- Very comfortable.
- Well-built headphones.
- Not very portable.
- Passive isolation can't block out low-frequency noises.
The Sennheiser HD 620S are poor for office work. While they're well-built and very comfortable to wear, they also don't isolate noises in the background like chatty colleagues. They don't have a microphone either, which means you'll need to rely on an outboard mic for work calls and meetings. Still, for wired headphones with passive noise isolation, they reproduce your audio with a largely balanced tuning and don't leak much of what you're listening to into the office.
- Very comfortable.
- Well-built headphones.
- Sub-par frequency response consistency.
- No microphone.
- Passive isolation can't block out low-frequency noises.
The Sennheiser HD 620S are wired-only headphones, so they won't work wirelessly.
The Sennheiser HD 620S aren't bad for wired gaming. Their drivers are well-matched, so you can reliably locate objects in the stereo mix. They're well-built and comfortable to wear with cushioned ear pads. They also comply well with our target curve for a balanced sound signature overall. On the other hand, their frequency response consistency can vary and change how they sound on different people. They also don't interact with your outer ear's pinna much, so your sense of immersiveness doesn't mimic an angled reference speaker. They also don't have a microphone, so if you play on a team and don't have an outboard mic, you'll need one.
- Very comfortable.
- Well-built headphones.
- Sub-par frequency response consistency.
- No microphone.
The Sennheiser HD 620S have very good audio reproduction accuracy. Their frequency response complies with our target across the bass, mids, and treble for an overall balanced sound signature. The drivers produce low harmonic distortion, resulting in no audible timbral coloration, and the L/R output is well-matched for a stable stereo sound. On the other hand, they have disappointing frequency response consistency, leading to notable differences in how they sound on different wearers, and their peaks and dips are decent, but some frequencies can jump out from the mix a bit or get buried. They also don't interact with your outer ear the way that an angled reference speaker would, which weakens their immersiveness.
The Sennheiser HD 620S have middling noise isolation. They're closed-backs but they only passively isolate, so high-pitched background noise is somewhat muffled, though chit-chat and deep rumbles aren't strongly attenuated. As a result, you'll still hear some of the sounds in your circumstances.
The Sennheiser HD 620S don't include a microphone.
The Sennheiser HD 620S have disappointing frequency response consistency. As a result, they sound rather different on different people, particularly in the bass range. If you wear glasses, the frames break the seal and weaken the bass. Meanwhile, if you have a larger head, they sound bassier, more so than our raw frequency response measurement.
Performance Usages
Changelog
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Updated Mar 26, 2026:
This review has been updated to Test Bench 2.1, which removes the Group Delay test and rebalances scoring for the Harmonic Distortion test and Audio Reproduction Accuracy performance usage. For more details, consult our full changelog.
- Updated Mar 24, 2026: We've converted this review to Test Bench 2.1, which features minor updates to our sound tests.
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Updated May 21, 2025:
This review has been updated to Test Bench 2.0, which adds the following tests: Stereo Mismatch, Group Delay, Cumulative Spectral Decay, PRTF, Harmonic Distortion, and Electrical Aspects. We've added new performance usages and updated the text throughout the Sound tests.
- Updated May 14, 2025: We've converted this review to Test Bench 2.0, which updates our sound tests and performance usages. You can read more about this in our changelog.
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Differences Between Sizes And Variants
The Sennheiser HD 620S come in one color, 'Black.' You can see our unit's label here. If you come across other variants, let us know in the comments.
Popular Headphones Comparisons
If you ignore the marketing around the Sennheiser HD 620S, they're essentially closed-back headphones with angled transducers, and they look like the closed-back cousin to the open-backed Sennheiser HD 560S but with a chunkier build. Obviously, the HD 620S isolate better than their open-back counterparts, but their soundstage isn't as open by virtue of design limitations. Popular closed-backs like the Beyerdynamic DT 770 PRO score better PRTF results, and these also output more consistent bass than the Sennheiser HD 620S. Adding somewhat to the confusion is figuring out exactly who the HD 620S are for. The manufacturer states these are for audio enthusiasts, which can account for the focus on upgraded comfort and build, while more professional features like balanced cabling are available, but at an added cost.
Still trying to figure out what you want? Check out the best closed-back headphones, the best headphones for audiophiles, and, if you really want a spacious soundstage, the best open-back headphones.
The Beyerdynamic DT 700 PRO X deliver much more consistent sound between wears than the Sennheiser HD 620S. Their mostly metal build and extra cable feel more premium. The Sennheiser are slightly more comfortable to wear, but the bass delivery is negatively affected by wearing glasses. If you want a darker treble response, the Sennheiser don't boost treble as much as the Beyerdynamic.
While both headphones are well-made and comfortable, choosing between the Beyerdynamic DT 770 PRO and the Sennheiser HD 620S depends on your tuning preference. The Beyerdynamic have a more consistent frequency response, translating to a more predictable sound profile regardless of your head shape or if you wear glasses. Although neither pair excels in this regard. Their sound is much brighter than the Sennheiser, which can inch you towards either pair depending on tastes, though both headphones isolate out noise similarly. On the other hand, the Sennheiser are more comfortable with fewer exposed wires, and you can replace the detachable cable.
The Sennheiser HD 620S and FIIO FT1 are both very comfortable closed-back headphones. Which you'll like best relies on whether you want a more laid-back, balanced tuning, as with the Sennheiser, or a warmer, bassier sound profile, as with the FIIO. The Sennheiser are better built with tighter L/R driver matching. However, you get fewer accessories, like a single average 3.5mm cable and basic pouch, which cheapens the package somewhat. The FIIO, on the other hand, are more visually arresting, with wood on the ear cup housings, and they also come with a proper zip case and a second balanced audio cable. While neither pair has great frequency response consistency, the FIIO are slightly better in this regard, but it's worth checking the graphs to see how people with your anatomy or accessories (head size, hair length, glasses, etc) fare when wearing them.
The Sennheiser HD 600 are open-back headphones with a much more open sound than the Sennheiser HD 620S. The HD 600 have a less erratic treble response and more detailed mids, though the bass is more subdued than the HD 620S. Your audio is also reproduced with better consistency on the HD 600. The closed-back HD 620S block out more environmental sounds due to their closed-back design. They're comfortable and well-made, but don't deliver audio as consistently, and their sound isn't as immersive. Still, if you want more body in your bass, they provide a thicker-sounding thud.
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