SENNHEISER HD 400 PRO Studio Reference Headphone 

Important safety instructions

  1. Read these safety instructions and the instruction manual of the product.
  2. Keep these safety instructions and the instruction manual of the product. Always include all instructions when passing the product on to third parties.
  3. Only use attachments, accessories and spare parts specified by the manufacturer.
  4. Do not attempt to open the product housing on your own. The warranty is voided for products opened by the customer.
  5. Refer all servicing to qualified service personnel. Servicing is required when the product has been damaged in any way, liquid has been spilled or objects have fallen into the product, when the product has been exposed to rain or moisture, does not operate normally, or has been dropped.
  6. Use the product only under the conditions of use listed in the specifications.
  7. Do not operate the product if it was damaged during transportation.
  8. Keep the product and its connections away from liquids and electrically conductive objects that are not necessary for operating the product.
  9. Do not use any solvents or aggressive cleaning agents to clean the product.
  10. Do not listen at high volume levels for long periods of time to prevent hearing damage.
  11. Do not use the product in an environment that requires your special attention (e.g. in traffic).
  12. Keep the product, accessories and packaging parts out of reach of children and pets to prevent accidents and choking hazard.
  13. The product generates stronger permanent magnetic fields that could cause interference to cardiac pacemakers, implanted defibrillators (ICDs) and other implants. Always maintain a distance of at least 3.94″ (10 cm) between the product component containing the magnet and the cardiac pacemaker, implanted defibrillator or other implant.
Intended use

These dynamic open headphone are designed for professional monitoring use such as broadcast, TV, film, theater and studio recording applications. The product can be used for commercial purposes.
Due to the high sound pressure levels attainable, these headphones must not be used with portable playback devices.
It is considered improper use when this product is used for any application not named in these safety instructions.
Sennheiser does not accept liability for damage arising from abuse or misuse of this product and its attachments/accessories.

Manufacturer declarations


Sennheiser electronic GmbH & Co. KG gives a warranty of 24months on this product.
For the current warranty conditions, please visit our website at or contact your Sennheiser partner.
In the US please contact:
Sennheiser Electronic Corporation
1 Enterprise Drive, Old Lyme, CT 06371
Sennheiser Australia Pty Ltd provides a warranty of 24 months on these products.
For the current warranty conditions, visit Sennheiser website:
New Zealand:

Sennheiser goods come with guarantees that cannot be excluded under Australian and New Zealand Consumer law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.
This warranty is in addition to other rights or remedies under law. Nothing in this warranty excludes, limits or modifies any remedy available to be consumer which is granted by law.
To make a claim under this contract, raise a case via Sennheiser website
New Zealand:
All expenses of claiming the warranty will be borne by the person making the claim.
Sennheiser international warranty is provided by: Sennheiser Australia Pty Ltd (ABN 68 165 388 312) Level 14, Tower A Zenith Building, 821 Pacific Highway, Chatswood NSW 2067, Australia
In compliance with the following requirements

  • EU: WEEE Directive (2012/19/EU
  • UK: WEEE Regulations (2013)

Notes on disposal
The symbol of the crossed-out dumpster on the product, the (rechargeable) battery (if applicable) and/or the packaging indicates that these products must not be disposed of with normal household waste, but must be disposed of separately at the end of their service life. For the packaging, follow the regulations in your country for separating waste. Improper disposal of packaging materials can be harmful to your health and the environment.
The separate collection of waste electrical and electronic equipment, (rechargeable) batteries (if applicable) and packaging is intended to promote reuse and recycling and to prevent negative impacts on public health and the environment, for example due to hazardous substances contained in these products. At the end of their service life, recycle electrical and electronic equipment and (rechargeable) batteries so that their materials can be reused and to prevent environmental pollution.
If (rechargeable) batteries can be removed without destroying them, you are obliged to dispose of them separately (see the product’s operating instructions for information on how to remove the batteries safely). Be especially careful when handling (rechargeable) batteries containing lithium, as these pose special hazards, such as the risk of fire and/or health risks if button cells are swallowed. Reduce battery waste as much as possible by using longer-life batteries or rechargeable batteries.
Further information on the recycling of these products can be obtained from your municipal administration, from the municipal collection points, or from your Sennheiser partner. You may also be able to return electrical or electronic equipment to your distributor, if they are legally required to do so. By disposing of your batteries properly, you are helping to protect public health and the environment.

UK Declaration of conformity

  • RoHS Regulations (2012) Importer: Sennheiser UK Ltd. Pacific House, Third Avenue, Globe Park, Marlow Buckinghamshire SL7 1EY, United Kingdom

EU Declaration of conformity

  • RoHS Directive (2011/65/EU)
    The full text of the EU declaration of conformity is available at the following internet address:


  • 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


Transducer principle dynamic, open
Ear coupling circumaural
Ear pad material Velour
Jack plug 3.5 mm jack plug with
6.3 mm adapter
Weight w/o cable 240 g
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)
Temperature Operation: –15 °C …. +55 °C Storage: –55 °C …. +70 °C
Relative humidity ≤90%


Greater China


▶ Replace oder remove the earpads with care.

Sennheiser electronic GmbH & Co. KG
Am Labor 1, 30900 Wedemark, Germany
Printed in Germany, Publ

Documents / Resources

SENNHEISER HD 400 PRO Studio Reference Headphone [pdf] Instruction Manual
HD 400 PRO Studio Reference Headphone, HD 400 PRO, Studio Reference Headphone, Reference Headphone, Headphone


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