Sennheiser HD400U

The Sennheiser HD 400U are lightweight, wired, over-ear headphones with a closed-back design and digital USB-C connection. The dynamic drivers operate in a frequency range of 18Hz to 20kHz, have an impedance of 18 Ohms, and achieve a sound pressure level of 120dB at 1kHz. The closed-back design also provides passive isolation from ambient noise. The detachable cable with an integrated controller and omnidirectional microphone allows you to manage your music and phone calls.

Digital USB-C Connection and In-line Controls

The Sennheiser HD 400U uses a USB-C connection for digital, uncompressed audio transmission without the need for Bluetooth pairing. The wired operation requires no battery charging, and the headphones are ready to use as soon as you plug them in. The integrated controller allows you to manage music playback, answer calls, switch tracks, and use your voice assistant. The omnidirectional microphone, with a frequency range of 100Hz to 10kHz, is perfect for phone calls, video conferences, and other voice communication. The detachable cable allows you to use either the digital USB-C connection or an analogue connection with a corresponding audio cable.

Closed-back Design with Passive Isolation

The closed-back, over-ear design of the headphones provides passive isolation from ambient sounds. The dynamic drivers cover a frequency range from 18Hz to 20kHz, and the impedance is 18 Ohms. The sound pressure level is 120dB at 1kHz, and the total harmonic distortion (THD) is less than 0.5% at 1kHz and 100dB SPL. The headphones weigh 217g, and their lightweight construction is designed for comfortable use over long periods. The foldable design ensures easy portability.