Sennheiser HD 400

HD 400 Series

Lightweight, foldable headphones

The HD 400 Series features a one-button smart remote, which allows you to control music and take calls with ease, and the sturdy folding design makes these headphones durable and compact enough to be taken anywhere. Choose between a traditional 3.5mm audio jack cable with the HD 400S, or a USB-C cable for all of your devices with the HD 400U.

Features

• True Sennheiser sound: Balanced tuning with clear mids, detailed highs, and controlled bass
  
• Pure digital audio: 3.5mm audio jack or USB-C connection delivers stable, uncompressed sound without pairing or charging
  
• Flexible listening: Removable cable system lets you use the included USB-C cable or switch to an optional analog cable
  
• Stay connected: Inline remote and microphone for easy call handling and music control
  
• Comfortable closed-back design: Lightweight, foldable construction with passive noise isolation and soft, replaceable ear pads
• Built to last: Durable materials engineered for everyday reliability

For a unique listening experience

Sennheiser’s dynamic drivers deliver a well-extended sound response with dynamic bass for a unique listening experience and closed-back around-ear headphones reduce unwanted background noise for your comfort.

Sound that stays true

Hear music the way the artist intended.

At the heart of the HD 400 Series is the Signature Sennheiser Sound. Carefully tuned to be balanced and natural, it reveals emotional detail that standard headphones often miss. Clear and expressive mids, shimmering highs, and deep yet controlled bass combine to create a listening experience that feels authentic, immersive, and true to the music.

Instant digital connection

Plug and play simplicity that lets the music speak.

The 3.5mm audio jack or USB-C digital connection delivers uncompressed audio directly from your device to your ears. With no pairing rituals or batteries to manage, the HD 400 Series offers a reliable, plug-and-play experience across compatible smartphones, tablets, laptops, and computers. Just connect and press play.

Instant digital connection

Comfortable design, ideal to carry around.

Lightweight and secure, the HD 400 Series is built for hours of comfortable listening. The closed-back over-ear design provides passive noise isolation while allowing the sound to breathe. Soft, replaceable ear pads and a foldable construction make it ideal for work, travel, and everyday use.

Instant digital connection

Flexible and functional

The removable cable system gives you the freedom to adapt to different devices. Use the included 3.5mm audio jack or USB-C cable with inline remote and microphone for calls and playback, or switch to an optional analog cable when needed.

Specifications

Transducer principle: Dynamic, Closed-back
Wearing style: Over-Ear
Acoustic principle: Closed
Adapter Choices: 3.5mm, angled or USB-C
Cable length: 1.4m
Weight: 217g
Frequency response (speaker): 18Hz to 20,000Hz (-10dB)
Impedance: 18 Ω
Speaker Sound pressure level (SPL): 120dB SPL@1kHz, 1V RMS
Transducer size: 9.7mm
Total harmonic distortion (THD): < 0.5% (1kHz, 100dB SPL)
Frequency response (microphone): 100Hz to 10,000Hz
Microphone pick-up pattern: Omni-directional
Microphone Sound pressure level (SPL): -44dbV/Pa

What's in the box

For the HD 400S (3.5mm plug version):

• 1 × HD 400S around-ear headphones
• 1 × RCS 400 detachable single-sided cable with 1-button remote
• 1 × 3.5 mm angled plug

For the HD 400U (USB-C plug version):

• 1 × HD 400U around-ear headphones
• 1 × RCU 400 Detachable single-sided cable with 1-button remote
• 1 × USB-C Plug