Who says closed-back headphones can't sound open? The HD 620S is a closed-back headphone for audio enthusiasts looking for a distraction-free listening experience without sacrificing natural, airy and detailed sound. With its exceptionally open baffle and angled transducers, it succeeds in reproducing the spatial imaging of loudspeakers - without distractions.
Discover the Sennheiser HD 620S Closed-Back Dynamic Headphones, where high-performance audio meets the intimacy of a closed-back design without sacrificing the expansiveness typically reserved for open-back models. Sennheiser crafted an auditory experience that turns distraction off and a speaker-like open sound on. This model is perfect for the audiophile who demands a pristine sound environment even in the busiest settings. With the HD 620S, Sennheiser delivers reference-level detail, engaging dynamics, and panoramic soundstage in a design that keeps the outside world precisely where it belongs—out.
The Sennheiser HD 620S headphones feature angled transducers that achieve an impressive panoramic soundstage—uncommon for closed-back designs. This setup ensures that every detail is spread wide and clear, simulating the immersive experience of a room filled with speakers. Coupled with a substantial yet perfectly balanced bass output, these headphones provide an enveloping listening experience that keeps external noises at bay, allowing for complete musical immersion.
Experience the pure, uncoloured sound that Sennheiser is famous for with the HD 620S. These headphones feature ultra-low distortion across the entire frequency range, ensuring that every note is reproduced with crystal clarity. The natural vocal reproduction maintains an intimate and true sound, presenting music as it was meant to be heard, with all frequency bands beautifully intact and unobscured.
With a focus on user comfort and product longevity, the HD 620S combines a lightweight frame with high-end materials. The ear pads and headband are crafted for prolonged use, so you can enjoy endless hours of music without discomfort. Whether at home or in transit, these headphones ensure a comfortable listening experience that doesn't compromise on sound quality.
| Feature | Description |
|---|---|
| Article Number (SKU) | HD 620S |
| Cable Length | 1.8 m |
| Wearing Style | Over-Ear |
| Ear Cushion Material | PU leather |
| Frequency Response | 6 Hz to 30 kHz |
| Nominal Impedance | 150 Ohm |
| Packaging Dimensions | 237x191x96 mm (LxWxH) |
| Package Weight | 670 g |
| Sound Pressure Level (SPL) | 110 dB (1 kHz / 1 Vrms) |
| Storage Temperature | -15°C to 65°C |
| Total Harmonic Distortion (THD) | < 0.05 % (1 kHz / 90 dB SPL) |
| Transducer System (Headphones) | Dynamic, closed |


The dashed black line represents the Harman target, a reference frequency response developed based on consumer preferences. The red/blue line represents the measurement of the HD620S. In practice, it shows how much the headphone's frequency response deviates from the target. However, note that the target is highly smoothed, and it is not necessary to strictly adhere to the Harman target for a headphone to sound good.
This one has a strong emphasis on the bass around 100Hz, and again some emphasis on the lower mids. This means it will not sound shrill, but make the body of the music stand out more instead. This will sacrifice a bit of resolution and timbre for a fun listening experience.
Harman research:
Perceiving and measuring the sound quality of headphones - what do listeners prefer?