Sennheiser HD 400 – Over Ear Closed Back Headphones

Sennheiser HD 400 – Over Ear Closed Back Headphones

Sennheiser HD 400 series delivers dynamic sound in a lightweight, foldable design for portable listening. Available with either a 3.5mm jack cable (HD 400S) or USB-C cable (HD 400U), these closed-back over-ear headphones provide versatile connectivity for all your devices.

• Lightweight, foldable over-ear design for portability
• Available with 3.5mm jack (HD 400S) or USB-C cable (HD 400U)
• Closed-back design reduces unwanted background noise
• Dynamic 9.7mm drivers (18 Hz - 20,000 Hz)
• 1-button smart remote for music control and calls
• Detachable single-sided cable (1.4m)
• 2 Year Warranty

Highlights & Key Technologies

Lightweight Foldable Design
The HD 400 series features a sturdy folding design that makes these headphones durable and compact enough to be taken anywhere. The lightweight construction ensures comfortable extended listening sessions while the foldable mechanism allows for easy storage and portability.

Dynamic Sound Performance
Sennheiser's dynamic drivers deliver a well-extended sound response with dynamic bass for a unique listening experience. The 9.7mm transducers provide a frequency response from 18 Hz to 20,000 Hz, ensuring rich, detailed audio reproduction across the entire audible spectrum.

Closed-Back Acoustic Design
Closed-back around-ear headphones reduce unwanted background noise for your comfort. The circumaural design provides passive noise isolation, allowing you to focus on your music without external distractions while also preventing sound leakage.

Versatile Cable Options
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. Both versions feature detachable single-sided cables with 1-button smart remotes, allowing you to control music and take calls with ease. The 1.4-meter cable length provides ample reach while minimizing tangles.

Integrated Remote and Microphone
The one-button smart remote allows for convenient control of music playback and phone calls. The built-in omnidirectional microphone with a frequency response of 100 to 10,000 Hz ensures clear voice transmission during calls.

Details & Specifications

MODEL INFORMATION
Model: HD 400S (3.5mm jack), HD 400U (USB-C)
Article No.: 508598 (HD 400S), 800127 (HD 400U)
Warranty: 24-month warranty

ACOUSTIC SPECIFICATIONS
Transducer principle: Dynamic, closed-back
Acoustic principle: Closed
Frequency response (headphones): 18 Hz to 20,000 Hz
Impedance: 18 Ω
Transducer size: 9.7 mm
Total harmonic distortion (THD): < 0.5% (1 kHz, 100 dB)

MICROPHONE SPECIFICATIONS
Frequency response (microphone): 100 to 10,000 Hz
Microphone pick-up pattern: Omnidirectional

CABLE & CONNECTIVITY
HD 400S cable: RCS 400 detachable single-sided cable with 1-button remote and 3.5 mm angled plug
HD 400U cable: RCU 400 detachable single-sided cable with 1-button remote and USB-C plug
Cable length: 1.4 m / 4.6 ft
Cable design: Single-sided, detachable

DESIGN & COMFORT
Wearing style: Over-ear (circumaural)
Design: Closed-back, foldable
Weight: 217 g / 7.7 oz

CONTROLS
Remote control: 1-button smart remote for music control and calls

INCLUDED ACCESSORIES
HD 400S includes:
HD 400S over-ear headphones
RCS 400 detachable cable with 1-button remote and 3.5 mm angled plug
Quick guide
Safety guide

HD 400U includes:
HD 400U over-ear headphones
RCU 400 detachable cable with 1-button remote and USB-C plug
Quick guide
Safety guide