TurboVS
Sennheiser HD 620S specifications and in-depth review

Sennheiser HD 620S

Manufacturer: Sennheiser

The Sennheiser HD 620S is a wired over-ear headphone built around a closed-back design that provides passive noise reduction, making it suited for environments where some degree of sound isolation is useful. It connects via a detachable, tangle-free cable measuring 1.8 meters in length, and does not incorporate any wireless or battery-dependent technology.

On the technical side, the HD 620S uses 42 mm drivers with an impedance of 150 Ohms and a sound pressure level of 110 dB/mW, covering a frequency range from 6 Hz up to 30,000 Hz. The headphones feature stereo speakers but include no microphone, in-line controls, or active noise cancellation, and are not foldable nor do they come with a travel bag.

Pros
  • The detachable, tangle-free cable measuring 1.8 meters makes for easier storage and straightforward cable replacement
  • Closed-back design provides passive noise reduction, helping to block out ambient sound during listening
  • Wide frequency range from 6 Hz to 30,000 Hz covers both deep bass and high-frequency detail
  • Stereo speaker configuration delivers distinct left and right channel audio
  • Wired-only connection ensures a stable, uninterrupted signal with no latency concerns
Cons
  • High impedance of 150 Ohms may require a dedicated amplifier or high-output source to drive properly
  • No active noise cancellation means users rely solely on passive isolation in louder environments
  • Cannot be folded, which limits portability and makes storage in compact spaces less convenient
  • No travel bag is included, offering no built-in protection for transport
  • Lacks any microphone or in-line controls, so it cannot be used for calls or hands-free interaction
  • No water resistance of any kind, making it unsuitable for use in wet or high-humidity conditions
Who is this for?

The HD 620S is well suited to dedicated home or studio listening, where its 150 Ohm impedance can be properly driven by a desktop amplifier or audio interface. Its closed-back construction and passive noise reduction make it a reasonable choice for focused listening in moderately noisy environments, such as home offices or recording spaces where some sound isolation is beneficial. Users who prefer a stable, wired connection and have no need for wireless functionality will find its straightforward, cable-based design practical and reliable.

Who is this NOT for?

This headphone is not well suited to users who need portability or on-the-go convenience, as it cannot be folded, includes no travel bag, and carries no water resistance rating. Those who require hands-free communication or call functionality will find it inadequate, given the complete absence of microphones and in-line controls. Additionally, users relying on smartphones or low-powered portable devices may struggle to drive the 150 Ohm impedance to satisfactory listening levels without a dedicated amplifier.

Design:

Fit Over-ear
has a detachable cable ✓
water resistance None
can be folded ✕
is designed for kids ✕
has a tangle free cable ✓
travel bag is included ✕
has an open-back design ✕
cable length 1.8 m
has stereo speakers ✓

The Sennheiser HD 620S uses an over-ear fit and features a closed-back design, providing a sealed listening experience. It comes with a detachable, tangle-free cable measuring 1.8 meters in length, offering convenience for storage and replacement. The headphones are not foldable and do not include a travel bag, nor do they carry any water resistance rating. They are not designed for children and include stereo speakers as part of their audio setup.

Sound quality:

has active noise cancellation (ANC) ✕
lowest frequency 6 Hz
highest frequency 30000 Hz
driver unit size 42 mm
impedance 150 Ohms
supports spatial audio ✕
sound pressure level 110 dB/mW
has a neodymium magnet ✕
has passive noise reduction ✓

The HD 620S covers a frequency range of 6 Hz to 30,000 Hz and uses 42 mm drivers with a sound pressure level of 110 dB/mW. Its impedance sits at 150 Ohms, which is worth noting for source compatibility. The headphones offer passive noise reduction but do not include active noise cancellation or spatial audio support, and the drivers do not use a neodymium magnet.

Power:

Has USB Type-C ✕
has a battery level indicator ✕
has wireless charging ✕
has a rechargeable battery ✕
has a removable battery ✕

The HD 620S requires no battery or charging of any kind, as it does not include a rechargeable or removable battery, wireless charging, USB Type-C connectivity, or a battery level indicator. This reflects its fully wired operation, which eliminates any power-related considerations for the user.

Connectivity:

connectivity Wired
has aptX Adaptive ✕
has aptX ✕
has LDAC ✕
has LDHC ✕
has aptX Low Latency ✕
has aptX HD ✕
has aptX Lossless ✕
has AAC ✕
has fast pairing ✕
supports Bluetooth pairing using NFC ✕

The HD 620S uses a wired connection exclusively and does not support any form of Bluetooth connectivity. As a result, wireless audio codecs such as aptX, aptX HD, aptX Adaptive, aptX Low Latency, aptX Lossless, LDAC, LDHC, and AAC are all absent. Features tied to wireless pairing, including fast pair and NFC pairing, are likewise not available.

Features:

has a noise-canceling microphone ✕
has ambient sound mode ✕
has in/on-ear detection ✕
number of microphones 0
has a mute function ✕
control panel placed on a device ✕
can be used as a headset ✕
Has an in-line control panel ✕

The HD 620S is a listening-only headphone with no microphones included, meaning it cannot be used as a headset and offers no mute function or noise-canceling mic capability. It also lacks in-ear detection, ambient sound mode, and any form of in-line or on-device control panel, keeping the feature set strictly focused on audio playback.

Final Verdict

The Sennheiser HD 620S is a straightforward wired over-ear headphone built for users who prioritize focused, stationary listening over portability or versatility. Its wide frequency range paired with a closed-back, passive noise-isolating design makes it a coherent choice for home or studio environments where sound isolation and audio fidelity matter more than wireless convenience or hands-free functionality. The 150 Ohm impedance demands a capable source, and the lack of folding, a travel bag, or any water resistance firmly places this headphone in a fixed-use context. For listeners who can meet its source requirements and have no need for microphones or wireless features, the HD 620S delivers a focused, no-frills listening experience that aligns well with its design intent.

Popular Comparisons

Sennheiser HD 620S
Sennheiser HD 620S
VS
FiiO FT1
FiiO FT1
Sennheiser HD 620S
Sennheiser HD 620S
VS
Sony MDR-M1
Sony MDR-M1