Sennheiser has long been a revered name in the headphone industry, known for delivering high-quality audio products that cater to both audiophiles and casual listeners. Their HD 600 series, in particular, has been a benchmark for open-back headphones since the late ’90s.
Now, Sennheiser introduces the HD 620S, a closed-back headphone designed to offer the same airy, spacious sound signature of its open-back counterparts while providing better isolation and reducing sound leakage.
Priced at £300 / $350 / AU$650, the HD 620S aims to deliver a balanced audio experience for those who want the best of both worlds.
Key Takeaways
- The Sennheiser HD 620S combines open-back sound quality with closed-back isolation.
- Priced at £300 / $350 / AU$650, targeting both audiophiles and casual listeners.
- Solid build quality with a few design elements borrowed from the lower-tier range.
- Excellent sound quality with a focus on spaciousness and detail.
- Some users may find the clamping force too firm for long listening sessions.
Sennheiser HD 620S Review
The HD 620S marks a significant departure from Sennheiser’s traditional open-back design philosophy within the HD 600 series. The primary goal was to retain the airy, open sound characteristic of the series while offering the privacy and noise isolation benefits of a closed-back headphone. This model is especially appealing to those who appreciate the sound quality of the HD 600 but need a more portable and private listening experience.
Design & Build
The Sennheiser HD 620S features a design that closely resembles the 500-series rather than the 600-series. This is evident in the extensive use of plastic, although the build quality is solid with reinforced metal in the headband and earcup housings. The headphones have a speckled, textured finish on the earcups, distinguishing them from their open-back counterparts. Despite the high amount of plastic, the HD 620S feels robust and sturdy, with no creaks or signs of weakness when handled.
Comfort & Fit
Comfort has always been a hallmark of the Sennheiser HD 600 series, and the HD 620S attempts to uphold this tradition. There is decent cushioning on the headband and even more padding on the ear pads, making them suitable for long listening sessions. However, some users might find the clamping force a bit too firm, which can be uncomfortable during extended use.
Adjusting the headband is straightforward, and the earcups swivel enough to create a good seal around the ears. While the earcups provide ample space, they can cause your ears to warm up after prolonged use. In comparison, the Beyerdynamic DT 700 Pro X offers a more comfortable fit with its plush velour earpads and lighter clamping force.
Features & Accessories
The HD 620S comes with a few essential accessories: a detachable 1.8m cable with a 3.5mm plug, a 3.5mm to 6.3mm adapter, and a soft carry pouch. The cable locks securely into the left earcup and can be easily replaced with other cables, such as a balanced 4.4mm cable, which will be available later. The headphones do not fold up or fold flat, which can make them cumbersome for travel despite the closed-back design that favors public use.
Technical Specifications
Here are the detailed technical specifications of the Sennheiser HD 620S:
| Specification | Details |
| Type | Closed-back, over-ear |
| Drivers | 42mm dynamic |
| Frequency Response | 6Hz-30kHz |
| Impedance | 150 ohms |
| Weight | 350g |
| Cable Length | 1.8m (detachable) |
| Connectivity | 3.5mm plug with 6.3mm adapter |
| Additional Features | No ANC, optional balanced 4.4mm cable |
These specifications highlight the HD 620S’s potential for high-fidelity audio reproduction and compatibility with a range of audio sources and equipment.
Sound Quality
The sound quality of the HD 620S is where these headphones truly shine. Sennheiser has fitted the HD 620S with custom-tuned 42mm drivers and angled baffles to improve airflow and mimic the spacious sound of an open-back design. This results in an airy, spacious sound that is uncommon for closed-back headphones.
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When testing with various genres, the HD 620S delivers a relaxed, detailed, and smooth presentation. Vocals are natural and detailed without being overly forward. Tracks like Waxahatchee’s “Right Back To It” fill the soundstage with ease, while Run The Jewels’ “Close Your Eyes” showcases the controlled, impactful bass without creeping into boomy territory.
The sound signature is well-balanced, providing enough grip and fluidity for rhythmic tracks while maintaining clarity and precision in the high-end.
Performance & Usability
We tested the HD 620S using a variety of setups, including Tidal Hi-res on a MacBook Pro with the Cambridge Audio DacMagic 200M and Chord Mojo 2 DACs, and directly through the MacBook’s headphone port. The headphones perform admirably across different sources, although pairing with overly bright-sounding equipment can introduce a slight harshness.
The HD 620S excels in providing sound isolation, effectively keeping external noise out and preventing sound leakage. This makes them ideal for both home use and public environments where privacy is essential. However, the lack of folding design and firm clamping force may limit their portability compared to some rivals.
Pros and Cons
Pros:
- Airy, spacious sound: Mimics open-back headphones.
- Detailed and smooth presentation: Suitable for various genres.
- Sturdy build: Reinforced metal headband and earcup housings.
Cons:
- Firm clamping force: May cause discomfort over long listening sessions.
- Limited portability: Does not fold up or flat.
- Lacks dynamic punch: Could use more excitement and punch in sound dynamics.
How to the buy the Sennheiser HD 620S
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Conclusion
The Sennheiser HD 620S successfully balances the airy, open sound of the HD 600 series with the isolation benefits of a closed-back design. While it may not be perfect, with its firm clamping force and slightly subdued dynamics, it still offers an excellent listening experience for those who prioritize sound quality and detail. For audiophiles and casual listeners alike, the HD 620S is a worthy addition to Sennheiser’s lineup, providing a unique blend of open-back sound in a closed-back package.
The Sennheiser HD 620S is a solid choice for those seeking a high-quality closed-back headphone that delivers an open-back listening experience.
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