Issue 93


Ableton Live 12
What’s in. What’s out. What to expect.


Sennheiser HD 400 PRO Studio Headphones

Open-back monitoring ‘phones focus on a transparent rendering of audio with a lightweight design for marathon mix sessions


2 December 2021

Sennheiser launches a new pair of professional headphones for mixing, editing, and mastering. The HD 400 PRO studio reference headphones are designed for creators seeking natural and precise sound reproduction to accurately assess their audio mixes. To ease long sessions, the HD 400 PRO features a comfortable and lightweight open-back design fitted with soft velour ear pads. The unit includes both coiled and straight detachable cables, allowing the headphones to adapt to different use preferences.

“We are happy to introduce the first open studio headphones in Sennheiser’s PRO line,” commented Gunnar Dirks, Product Manager, Professional Audio. “When editing and mixing, you need detail and honesty, and this is what the HD 400 PRO will give you. Thanks to their linear, high-resolution reproduction, these headphones are a reliable reference to create outstanding audio mixes.”

Designed for Accuracy

The HD 400 PRO features a wide frequency response of 6 to 38,000 hertz to give music producers the full account of their mix. The Sennheiser-developed 120-ohm transducers include a diaphragm made from a special polymer blend, which together with powerful driver magnets yields deep, clear and well-defined bass. Distortion is below 0.05% (measured at 1 kHz, 90 dB SPL).

The HD 400 PRO accurately reproduces audio beyond the audible frequency range, giving you unbridled access to nuanced harmonics and ambiance in your music, while at the same time revealing a bold, articulate low-end.

Designed for Spaciousness

The headphone transducers of the HD 400 PRO sit at a slight angle, reflecting the triangluar sweet spot of monitors in the studio. In addition, the open-back design of the HD 400 PRO ensures a natural propagation of sound, unimpeded by the acoustic structures required in closed-back designs. Both aspects create a wide and spacious soundstage, neutral and transparent, which enables audio producers to work confidently knowing that their final mix transfers accurately to listeners.

Designed for Comfort

The HD 400 PRO headphones features comfort that prolongs creativity. An ultra-light frame positions the earcups in place, gently hugging the ears with minimal pressure. Soft velour earpads allow users to focus on projects for hours on end, while the open, circumaural design offers sufficient ventilation for ears to keep their cool, even during long mixing sessions.

Part of Dear Reality’s monitoring plugins

The HD 400 PRO can be used with Dear Reality’s headphone monitoring plugins, which create a virtual mix room with carefully designed acoustics thanks to advanced spatial audio technology. The headphones have already been integrated into the Spatial Headphone Compensation feature in dearVR MIX; dearVR MONITOR integration will be released by the end of this year.

The HD 400 PRO is available now and retails at EUR 249 (MSRP). The headphones come with a 3-meter coiled cable and a 1.8-meter straight cable, both fitted with a 3.5 mm (1/8”) jack plug for portable sources. A 6.3 mm (1/4”) adapter is included, ensuring that the HD 400 PRO connects to your mixing desk or audio interface.

Technical Data

  • Acoustic principle: dynamic, open
  • Ear coupling: circumaural
  • Frequency response: 6 – 38,000 Hz
  • THD: < 0.05% (at 1 kHz, 90 dB SPL)
  • Impedance: 120-ohm
  • Sound pressure level: 110 dB (1 kHz, 1 Vrms)
  • Connector: 3.5 mm (1/8”) jack with adapter to 6.3 mm (1/4”) jack
  • Weight: 240 g (w/o cable)



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Issue 93


Ableton Live 12
What’s in. What’s out. What to expect.