HD 400 PRO

Article No. 700047
$ 249.00
plus applicable sales tax

When working at home or in the studio, you need your mix to sound as it does when your listeners hear it. The HD 400 PRO open-back studio headphones provide a natural and accurate listening experience for fine tuning your signature sound. Its lightweight design and velour earpads provide the comfort you need during long sessions. In addition, open ear cups and angled transducers allow for a wide and transparent soundstage, making the HD 400 PRO a reliable companion for those who put quality and precision above all else.

Verdict: Sennheiser’s HD 400 PRO headphones are the first open-back pair in the brand’s PRO Series. They are designed primarily for creating first-class mixes, mainly thanks to the incredibly neutral tone and the definition produced by those 120Ω drivers. If you’ve only ever tried mixing on studio monitors or with closed-back headphones, you’re in for a real treat. The HD 400 PRO are ideal for mixing accurately and without coloration. However, despite all Sennheiser’s promotion of the HD 400 PRO as a professional tool for the recording studio, I also think they make great listening headphones for relaxing to high-quality audio tracks. This is largely thanks to the incredible 6 Hz to 38 kHz frequency range and low distortion levels. Take a listen to the HD 400 PRO and I think you will be impressed.
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From Forbes. © 2022 Forbes. All rights reserved. Used under license.


  • A professional's tool with neutral sound reproduction
  • Lightweight design for all-day usage
  • Single-sided, coiled cable allows freedom to operate. For convenience, a straight cable is also included
  • Angled transducers designed for low distortion at high SPL's provide a spacious and accurate soundstage


Reference-grade headphones for project and professional mixing sessions

The frequency range of HD 400 PRO was developed to be honest across the board, especially when it comes to the lower end of the spectrum. The angled transducer design allows for unique stereo imaging, reproducing the spatial sound of your mix.
In other words, what goes in is what comes out. Reproducing analytical audio, the HD 400 PRO reference headphones are your everyday tool to get the job done.

Reference-grade headphones for project and professional mixing sessions

Open back, open mix

Open ear cups allow for a wide and transparent soundstage, recreating the optimal listening position found in high-end recording studios. Artifacts of a confined space are a thing of the past. These studio headphones do not construe, but rather ensure neutral transparency – the groundwork for the best mixes.

Open back, open mix

The perfect synergy of comfort & precision

Let's face it, mixing sessions are never quick. The HD 400 PRO's lightweight design allows you to focus on your project for hours on end. Articulating earcups, velour earpads and an adjustable headband allow for adaptability and comfort to perfectly match the shape of your head.
Our self-developed 120-ohm transducers are tuned for accuracy to deliver every detail of your mix. The highly efficient driver magnet provides clarity while its damping system manages ventilation. This results in deeper bass while extenuating distortion that otherwise impacts sound quality — a difference professional users will appreciate.

The perfect synergy of comfort & precision

More tools for more options

The HD 400 PRO features a detachable coiled cable. For convenience, a straight cable is also included in the delivery. With a screw-on adapter you can connect to your mixing desk, audio interface or any audio device that has a 1/4-inch (6.3mm) or 1/8-inch (3.5mm) output.

More tools for more options

Place yourself in the sweet spot of your mixing environment

With dearVR MIX, the immersive audio expert Dear Reality turns the HD 400 PRO into a virtual world-class stereo mix room with carefully designed acoustics, all through advanced spatial audio technology. Gain confidence and create better mixes by inserting the AAX/VST3/AU plugin into your DAW and monitoring your session in reference studio acoustics or additional common listening environments, such as a car. With Dear Reality’s unique Spatial Headphone Compensation (SHC) technology, the sound characteristics of the HD 400 PRO remain unrestricted in the virtual studio environment, providing a monitoring solution to ensure that audio productions translate reliably to any sound system – regardless of production type or music genre.

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Place yourself in the sweet spot of your mixing environment
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HD 400 PRO -
Coiled Cable

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HD 400 PRO -
Straight Cable

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HD 400 PRO -
Ear Pads

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What's in the box?

  • HD 400 PRO Studio Reference Headphone
  • 3 m coiled cable with 3.5 mm jack plug
  • 3.5 mm jack plug to 6.3 mm adapter
  • 1.8 m straight cable
  • Quick Guide
  • Safety Guide

Technical Data

  • Impedance
    120 Ω
  • Frequency response
    6 Hz to 38 kHz (-10 dB)
  • Sound pressure level (SPL)
    110 dB (1 kHz / 1 V RMS)
  • THD, total harmonic distortion
    < 0.05 % (1 kHz / 90 dB SPL)
  • Ear coupling
  • Jack plug
    3.5 mm jack plug with 6.3 mm adapter
  • Weight
    240 g
  • Storage temperature
    –55 °C to +70 °C (–67 °F to 158 °F)
  • Operating temperature
    –15 °C to +55 °C (5 °F to 131 °F)
  • Operating relative humidity
    ≤ 90 %
  • Accoustic principle
    dynamic, open
  • Ear pad material


  • Instruction Manual
    • Instruction manual - HD 400 PRO (860 KB) Download

  • Spec Sheets
    • Product specification - HD 400 PRO (210 KB) Download

WARNING (for California residents only): This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects and other reproductive harm. For more information go to: www.p65warnings.ca.gov.