Sennheiser HD 620S Headphones

The First Closed-Back in Sennheiser's 600 Series

The HD 600 arrived in 1997 and has been a reference point ever since, but every headphone in that family has been open-backed — wonderful spaciousness, but no privacy at all for the person wearing them.

The HD 620S is the first closed-back member of the family, built specifically for the listener who loves how a 600 series headphone sounds but shares a room with someone who doesn't want to hear it.

A 150-ohm aluminum voice coil and angled 42mm drivers work together to fight the narrow, boxy sound that closed-back headphones usually suffer from, aiming for a genuinely wide stereo image instead.

Where the Angled 42mm Drivers Earn Their Keep

Fighting the Boxy Closed-Back Sound

Closed headphones usually sound narrow, since sealing the back traps sound behind the driver and those reflections come back as congestion, muddying the presentation in ways open designs never have to deal with.

Sennheiser angles the 42mm transducers rather than pointing them straight at your ear, closer to how a loudspeaker reaches you across a room, paired with a carefully developed baffle and internal damping.

A 150-Ohm Aluminum Voice Coil

The voice coil is aluminum and very light, so it starts and stops faster, which shows up as cleaner leading edges on notes and better-defined decay throughout every single recording you actually play.

At 150 ohms the impedance is half that of the HD 600, considerably easier to drive, and the bass surround is adopted from the HD 660S2, so the low end reaches deeper than expected.

Who Is the HD 620S Best For?

• You need privacy without losing the 600 series sound: a shared house, a quiet office, a room where an open-back pair isn't welcome
• You use these for gaming or recording: the closed design keeps sound from leaking into a microphone, and the wide imaging genuinely helps with positional audio
• You want an easier-to-drive 600 series headphone: at 150 ohms, this is considerably easier to power than the 300-ohm HD 600
• You want deeper bass than the classic 600 series typically delivers: the HD 660S2's bass surround carries over directly to this closed design
• You want real privacy from a closed-back Sennheiser — the HD 620S keeps it to yourself

How Does It Connect to Your System?

The detachable cable is 1.8 meters long, ending in a 3.5mm plug with a locking screw thread, and a supplied 6.3mm adapter screws on for a home amplifier or comes off for a portable source.

At 150 ohms these run from most sources, but they're not really designed for it — a headphone amplifier or a decent DAC genuinely gets considerably more out of them.

Pairs Well With

What finishes the system around an HD 620S:

• Headphone amplifiers — genuinely gets considerably more out of this driver than a phone or laptop alone
• Digital-to-analog converters — a clean digital source feeding your amp matters as much as the amp itself
• Headphone cables — an optional balanced cable is available separately for balanced amplifier outputs
• Headphone stands — a proper resting spot between listening sessions

Frequently Asked Questions

How do these compare to the HD 600?

They share a family character but solve different problems. The HD 600 is open-backed, 300 ohms, and leaks sound freely, while the HD 620S is closed, 150 ohms, and keeps your music to yourself.

Do I need a headphone amplifier?

Not strictly. At 150 ohms these will play from most sources. But they genuinely respond well to a proper amplifier, and if you already own one these will put it to use.

Is the clamping pressure comfortable?

Several reviewers have found it firmer than expected at first. It relaxes with use, but if you're sensitive to clamp, it's genuinely worth knowing before you order.

Can I use these for gaming or recording?

Yes to both. The closed design keeps sound from leaking into a microphone, and the wide imaging helps with positional audio, though there's no built-in microphone included.

Is the cable detachable?

Yes. The 1.8-meter cable terminates in a locking 3.5mm plug, with a 6.3mm adapter included, and an optional balanced cable is available separately from Sennheiser.

Where is the HD 620S made?

Manufactured in Ireland, the same facility responsible for Sennheiser's entire high-end reference headphone lineup, ensuring consistent quality across every single unit built.

See It in Action

Sennheiser presents HD 620S Audiophile Headphones - Features Deep Dive | Sennheiser.

Sennheiser presents Gaming with the HD 620S | Sennheiser.

Why Audio Advisor?

• 40+ Years of Expertise — Since 1981, we've helped over a million music lovers find the right gear.
• 60-Day Money-Back Guarantee — Take your time. Listen, enjoy, and make sure it's right for you.
• Real Experts, Real Help — Our team is here to answer your questions at 800-942-0220, weekdays 9am–6pm EST.
• Free Shipping — On orders over $49, delivered to your door.
• Flexible Payment Options — Financing available so you can start listening now.

Learn More

Want to learn more about closed-back headphones, headphone amplifiers, or getting the most from a dynamic-driver design? Visit our Learning Center for guides, tips, and expert advice.