Sennheiser HD 620S

The closed-back HD 620S is for audio enthusiasts seeking a distraction-free listening experience without compromising on natural, airy and detailed sound. Featuring a remarkably open baffle and angled transducers, it replicates the spatial imaging of loudspeakers while keeping listening sessions secluded.

You might think that’s impossible. Think again. The HD 620S combines the DNA of the HD 600 and 500 series, bringing the best of both headphone families to a closed chassis. Sennheiser’s HD 600 series has long been the standard for natural tone, thanks to Sennheiser's dedication to continuously improving the open-back concept. The 500 series introduced later offers a soundstage that immerses listeners in their music. The distinctive DNA combination of these two series lets the HD 620 excel where many closed headphones struggle, preserving the detailed, smooth sound the 600 series is known for. Sennheiser's reference-grade 42 mm angled transducers with 38 mm diaphragm and ultra-light 150-ohm aluminum voice coil deliver exceptional impulse response, expanding the stereo image to an almost panoramic soundstage.

That’s not only uniquely rare for a closed-back design; it will switch your understanding of closed-back headphone sound.

The HD 620S not only offers timeless design, but also timeless function and comfort. So your mind can focus on other things than high-maintenance headphones. The HD 620S chassis is lightweight yet familiar, bolstered by premium touches that will deliver its unique acoustic signature for years to come. The robust, steel-reinforced headband sliders and ear cup covers add timeless appeal and long-term durability to a silhouette sculpted for all-day wearing comfort. Spacious ear cup covers and the supple ear pads made from artificial leather not only offer superb acoustic isolation, but also add a comfortable touch thanks to internal venting.

The HD 620S is ready for hours of fatigue-free, intimate listening. Are you ready to switch?

How to read frequency response measurements for headphones:

The frequency is shown in Hertz (Hz) on the X-axis (numbers at the bottom). The bass response is from 20-300 Hz, the vocal range runs from 300 to 3000 Hz, and the treble is from 3000 to 20,000 Hz (i.e., details in the music). On the Y-axis (numbers on the left), the relative loudness is shown in dB SPL (decibel Sound Pressure Level). The higher the graph line, the louder the frequency. As an example: The bass response between 20 to 100 Hz is much louder in the HD 620S (white line), compared to the HD 600 (grey line). The frequency response is supposed to be perfectly flat in loudspeakers (i.e., all parts of the music are equally loud), but ear geometry and psychoacoustics mean a good headphone frequency response looks very different. While the science is not yet settled, most engineers and scientists in the headphone industry would agree that the HD 600 with additional bass is closer to a neutral, “true-to-life” sound.