Sennheiser HD 400S Closed-Back Over-Ear Headphone

The Sennheiser HD 400S is a closed-back over-ear headphone that combines the typical Sennheiser sound with an inline microphone and a foldable travel design at an entry-level price. It's built for anyone who wants clean sound on the go, in the home office, or on the sofa, without drifting straight into audiophile territory (and prices).

Why the HD 400S?

With 18 ohms impedance, the HD 400S runs directly off your phone or laptop - no extra device, no cable clutter in your bag. The closed-back design keeps the world out and your music in, and thanks to the freely swivelling ear cups it folds flat. The detachable cable with its one-button remote answers calls and pauses music without you reaching for your phone.

What you hear

The dynamic Sennheiser drivers deliver a balanced, slightly warmer sound with strong but not overbearing bass. Because the HD 400S is closed-back, little escapes and little gets in - on the train, in the office or the waiting room, your music stays yours.

Who is the HD 400S for?

Ideal for commuters, home office calls, and anyone looking for a rugged all-rounder at a fair price. Straight talk: anyone expecting the big, airy stage of an open-back, high-end headphone should look at the HD 550 or HD 599 instead - they play in a different league (and price class). The HD 400S doesn't want to show off, it wants to be a reliable companion.

Our verdict

An honest entry into the Sennheiser world: closed-back, foldable, phone-ready and with a microphone for everyday use. At HD Zürisee in Wädenswil we're happy to help you work out whether the HD 400S suits your listening habits or whether it's worth stepping up to an open-back model.

Technical data

• Design: over-ear, closed-back
• Driver principle: dynamic
• Impedance: 18 ohms
• Frequency response (headphone): 18 - 20,000 Hz
• Sound pressure level: 120 dB (1 kHz / 1 V RMS)
• Total harmonic distortion (THD): < 0.5 % (1 kHz / 100 dB)
• Microphone: integrated, with one-button remote on the cable
• Connector: 3.5 mm jack (angled), detachable cable
• Cable length: 1.4 m
• Weight: 217 g
• Included: HD 400S, detachable RCS-400 cable with one-button remote and 3.5 mm jack

Frequently asked questions

Can I use the Sennheiser HD 400S directly with a smartphone?

Yes. With 18 ohms impedance, the HD 400S plays perfectly well from a phone, tablet or laptop - no separate headphone amp needed. Thanks to the one-button remote, you control music and calls conveniently right on the cable.

Is the HD 400S open-back or closed-back?

The HD 400S is a closed-back headphone. That means it noticeably shields out ambient noise and gives off little sound to the outside. That's exactly what makes it pleasantly unobtrusive on the go, on the train, or in an open-plan office.

Does the HD 400S have a microphone?

Yes. The detachable cable has an inline microphone with a one-button remote. That lets you answer calls, end them, and pause music without reaching for your phone - handy for home office and life on the go.

Why buy the Sennheiser HD 400S from HD Zürisee?

Because we advise you honestly instead of just selling you the next headphone. We'll tell you whether the HD 400S suits your everyday life or whether another model fits better - with the experience of a seasoned team of specialists. Delivery across Switzerland, personal contact in Wädenswil. Call us on +41 44 680 22 00, message us on WhatsApp at 076 534 22 00 (text only, no calls) or email shop@hdzuerisee.ch.

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