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Black over-ear headphones with foldable frame and detachable cable

Sennheiser

Sennheiser HD 400 S headphone

SKU CH-WFZQ-HJTWB MPN HD 400 S

Over-ear headphones with 18 Hz–20 kHz response, 18 Ω impedance, 120 dB sensitivity, inline microphone and foldable design

  • Frequency range18 Hz-20 kHz (-10 dB)
  • Headphone style< 0.5 % (1 kHz, 100 dB SPL)
  • Impedance18 ohms
  • Audio sensitivity120 dB SPL @ 1 kHz, 1 V RMS
  • Connection3.5 mm
  • Wearing styleBinaural
  • Renowned Sennheiser sound quality for a unique listening experience
  • Built-in microphone and remote for call and music control
  • Closed-back around-ear design reduces unwanted background noise for comfort
  • Lightweight foldable construction at 0.48 lb enables easy on-the-go storage
  • 18 ohm impedance and 120 dB sensitivity ensure universal compatibility with portable devices

Closed-back over-ear design

The Sennheiser HD 400 S is a pair of closed-back over-ear headphones with a detachable single-sided cable ending in a 3.5 mm angled plug. A one-button inline remote on the cable handles music playback and phone calls through the built-in microphone. The folding construction reduces the footprint for transport and storage. The headphones weigh 0.48 lb.

Listeners needing portable isolation

Commuters and office workers who want passive noise reduction and a simple way to answer calls without reaching for a device will appreciate the closed-back cups and the cable-mounted remote. The 18 ohm impedance makes them easy to drive from phones or laptops. Buyers who prefer open-back soundstage or need active noise cancellation should look elsewhere.

18 ohm input impedance

With an input impedance of 18 ohms and a sensitivity of 120 dB SPL @ 1 kHz, 1V RMS, the headphones reach loud volumes from low-voltage sources such as smartphones and tablets without an external amplifier. The frequency response spans 18 Hz to 20 KHz (-10 dB), and total harmonic distortion stays below 0.5 % at 1 kHz, 100 dB SPL. The microphone covers 100 Hz to 10 KHz with a sensitivity of -44 dBV/Pa.

How it compares

Measured against everything we stock in Earbuds & Over-Ear Headphones, at today’s prices. Recalculated every night.

Price $49.99
Pricier than about 71% of the 7,078 comparable items (median $25.99).

Specifications

Product
Brand nameSennheiser
Model nameHD 400S
Product typeOver the Ear
Product colorBlack
Audio & video
Frequency range18 Hz-20 kHz (-10 dB)
Headphone style< 0.5 % (1 kHz, 100 dB SPL)
Impedance18 ohms
Audio sensitivity120 dB SPL @ 1 kHz, 1 V RMS
Wearing styleBinaural
Mic frequency response100 Hz-10 kHz
Mic sensitivity-44 dBV/Pa
Ports & slots
Connection3.5 mm
Size & build
Cord length4.59 ft (1.4 m)
Product weight0.48 lb (0.22 kg)
Shipping weight0.47 kg
Package size241 × 213 × 102 mm
Compatibility
Compatible withUniversal
In the box
In the boxHD 400S around-ear headphones
RCS 400 detachable single-sided cable with 1-button remote and 3.5 mm angled plug

Questions about this item

Does the 18 ohm impedance mean I can drive these loud enough from a phone?

Yes, the 18 ohm load and 120 dB sensitivity let a smartphone reach high volume without an extra amplifier.

What does the 18 Hz to 20 KHz range tell me about real-world sound?

It covers the full audible spectrum, so you hear deep bass down to 18 Hz and treble detail up to 20 KHz.

Is the 3.5 mm plug compatible with my laptop and console controllers?

The 3.5 mm angled connector fits standard headphone jacks on laptops, consoles and mobile devices.

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