SENNHEISER IE 900 High End In Ear Earphones
Important safety instructions
- Read this instruction manual carefully and completely before using the product.
- Always include these safety instructions when passing the product on to third parties.
- Do not use an obviously defective product.
Preventing damage to health and accidents
- Protect your hearing from high volume levels. Permanent hearing damage may occur when headphones are used at high volume levels for long periods of time. Sennheiser headphones sound exceptionally good at low and medium volume levels.
- Do not insert the earphones too deep into your ears and never insert them without ear adapters. Always remove the earphones slowly and carefully from your ears.
- The product generates stronger permanent magnetic fields that could cause interference with cardiac pacemakers, implanted defibril-lators (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.
- Keep the product, accessories and packaging parts out of reach of children and pets to prevent accidents. Swallowing and choking hazard.
- Do not use the product in an environment that requires your special attention (e.g. in traffic).
Preventing damage to the product and malfunctions
- Always keep the product dry and do not expose it to extreme temperatures (hairdryer, heater, extended exposure to sunlight, etc.) to avoid corrosion or deformation. The normal operating temperature is from –10°C to 55°C/14°F to 131°F.
- The earphone housings are milled from metal blocks. As a result, the first skin contact can cause irritation for a short moment at very cold or warm temperatures.
- Use only attachments/accessories/spare parts supplied or recommended by Sennheiser.
- Clean the product only with a soft, dry cloth.
Intended use/Liability
- These dynamic, closed in-ear headphones have been designed for use with high-quality portable music players and hi-fi systems.
- It is considered improper use when the product is used for any application not named in the corresponding product documentation.
- Sennheiser does not accept liability for damage arising from misuse or improper use of this product and its attachments/accessories.
- Before putting the product into operation, please observe the respective country-specific regulations.
Package contents
- 1 pair of IE 900 ear canal phones with MMCX sockets
- Connection cables with stereo jack plug, length approx. 1.25 m:
- 1 2.5 mm, balanced
- 1 3.5 mm, unbalanced
- 1 4.4 mm, balanced
- Ear adapters (in pairs):
- 3 silicone ear adapters, size S, M and L
- 3 Visco foam ear adapters with memory effect, size S, M and L
- 1 instruction manual
- 1 certificate of authenticity
- 1 cable fastening clip
- 1 transport case
- 1 cleaning tool
- 1 microfiber cloth
Your Sennheiser IE 900
For the most sophisticated audiophiles, the search for the ultimate sound is a ceaseless quest for perfection. Inspired by this passion, Sennheiser developed the IE 900, the new flagship of their in-ear headphone range, which sets new standards in audio fidelity.
From the exquisite one-piece metal housing, to an improved version of the acclaimed 7 mm XWB transducer, to the conductive properties of the sound channel: Every aspect, no matter how small, was considered to make Sennheiser’s extensive acoustic know-how audible in these in-ears. The new acoustic design features an enhanced voice coil, which optimizes performance at high frequencies for a brilliant, natural sound reproduction. Natural resonances and harmonic distortions are minimized by an optimized membrane foil. The result of the numerous refinements is an exceptionally natural sound reproduction to satisfy even the most discerning audio enthusiast.
The IE 900 is manufactured to tightest production tolerances at Sennheiser’s headquarters in Germany by a specialist team. Every transducer is fully tested twice – first individually and then together after the right and left earphones have been hand-selected in pairs. The transducers of the right and left earphones are carefully selected to optimally match with each other. This passion for detail is also reflected in the pro-audio inspired premium design. Each earphone housing is precision-milled from a single block of high-quality aluminum to ensure the highest audio quality while offering exceptional durability.
The IE 900 also provides outstanding connectivity with high-quality Fidelity+ MMCX connections and a choice of connection cables with 3.5 mm and balanced 2.5/4.4mm jack plugs. The ergonomic design includes individually adjustable ear hooks and a choice of ear adapters in different sizes for a perfectly secure fit. The cable is made of flexible material while the cable design allows the cable to fall naturally and, at the same time, significantly reduces structure-borne noise compared to standard cables. Thanks to the outstanding wearing comfort, the IE 900 is ideal for long listening sessions of unadulterated music enjoyment.
Illustrations can be found on the fold-out page.
Selecting the ear adapter and inserting the earphones into the ears

The perceived sound quality including bass performance and the reduction of ambient noise depends to a large extent on the correct fit of the earphones in the ears. Figure out which ear adapter type and size suits you best in terms of both sound quality and wearing comfort.
- Mount the ear adapters to the earphones until they lock into place. You can choose between 2 lock-in positions.
Silicone
- Select ear adapters of the correct size (S, M or L) so that the earphones sit com-fortably and securely in your ears.
Visco memory foam
- The ear adapters made of Visco foam adapt optimally to the ear canal due to the expansion of the memory foam.
- Select ear adapters of the correct size (S, M or L) and roll the ear adapters be-tween your fingers until they are small.
- Insert the earphones into the ears and hold the earphones for at least 15 seconds so that the compressed Visco foam can expand and the earphones sit snuggly in your ears.
Ear hooks
- To provide strain relief for the cables, the cables are guided over the ears. You can carefully bend the ear hooks so that they fit comfortably and securely, even if you wear glasses, for example.
- Insert the earphones into the ears. Observe the markings “R” (right; with additional red ring) and “L” (left; with additional tactile dots) for correct assignment.
Selecting and connecting the connection cable

Stereo jack plug on the device
- 2.5 mm, balanced signal transmission, 4- pin
- 3.5 mm, unbalanced signal transmission, 3- pin
- 4.4 mm, balanced signal transmission, 5- pin
MMCX connectors on the earphones
- Hold the earphones firmly and pull the connectors straight out of the sockets by overcoming a slight resistance. Always grasp the connectors by the connector housing and do not pull on the cable!
- When connecting, make sure that the markings “R” (right) and “L” (left) on the connectors match the earphones. The right ear canal phone is marked with a red ring and the left ear canal phone is marked with a tactile dot. Insert the connectors until they lock into place.
Optimum cable routing

Cleaning The Earphones

For reasons of hygiene, the ear adapters should be replaced from time to time. (The Visco memory foam ear adapters only have a durability of a few months due to their material properties). Spare parts are available from your Sennheiser partner. To find a Sennheiser partner in your country, search at www.sennheiser.com.
- Clean the product only with a soft, dry cloth.
- You can clean the ear adapters under lukewarm running water. Remove the foam pins before cleaning. Let the ear adapters and foam pins dry at room temperature for at least 12 hours before reassembling them and reattaching them to the earphones.
- To clean the sound channel grilles, use the cleaning tool (supplied) to carefully and lightly scrape over the grilles to remove dirt. Loosen the dirt without piercing the grilles.
Transporting and storing the IE 900

Pin assignment

Specifications
- Transducer principle: dynamic, Extra Wide Band (XWB)
- Transducer size: 7 mm
- Frequency response: 5 to 48,000 Hz
- Frequency characteristic: diffuse-field equalized
- Ear coupling: in-ear, closed
- Impedance: 18 Ω
- Sound pressure level: 123 dB at 1 kHz, 1 Vrms
- THD: < 0.05% (1 kHz, 94 dB)
- Attenuation: –26 dB
- Cable: oxygen-free copper cable (OFC), para-aramid reinforced, ear hooks: TPU-coated
- Connectors (see pin assignment on inside cover page)
- gold-plated;
- on the earphones: MMCX connector
- on the device: stereo jack plugs
- 3.5 mm, unbalanced, 3-pin
- 2.5 mm, balanced, 4-pin
- 4.4 mm, balanced, 5-pin
- Weight: approx. 4 g per ear canal phone (without cable)
- Operating temperature: –10°C to +55°C
- Maximum value of the static magnetic field at the surface: 1.3 mT
Manufacturer declarations
For information on regulatory compliance markings, see the inside back cover.
Warranty
Sennheiser electronic GmbH & Co. KG gives a warranty of 24 months on
this product. For the current warranty conditions, please visit our website at www.sennheiser.com or contact your Sennheiser partner.
The Australia and New Zealand Warranty Conditions can be found on the inside back cover.
In compliance with the following requirements
- General Product Safety Directive (2001/95/EC) Compliant to Sound Pressure Limits according to country specific requirements. EU/UK declaration of conformity
- EU: RoHS Directive (2011/65/EU)
- UK: RoHS Regulations (2012)
- ]The full text of the EU declaration of conformity is available at the following internet address: www.sennheiser.com/download.
Notes on disposal
- EU: WEEE Directive (2012/19/EU)
- UK: WEEE Regulations (2013)
The symbol of the crossed-out wheeled bin on the product, the battery/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 operational lifetime. For packaging disposal, please observe the legal regulations on waste segregation applicable in your country.
Further information on the recycling of theses products can be obtained from your municipal administration, from the municipal collection points, or from your Sennheiser partner.
The separate collection of waste electrical and electronic equipment, batteries/rechargeable batteries (if applicable) and packagings is used to promote the reuse and recycling and to prevent negative effects caused by e.g. potentially hazardous substances contained in these products. Herewith you make an important contribution to the protection of the environment and public health.
Trademarks
Sennheiser is a trademark of Sennheiser electronic GmbH & Co. KG, registered in the U.S. and other countries.
Fidelity+ MMCX is a product name from Delta Electronics Mfg. Corp.
Other product and company names mentioned in the user documentation may be the trademarks or registered trademarks of their respective holders.
Product warranty
For AUSTRALIA and NEW ZEALAND ONLY
Sennheiser Australia Pty Ltd provides a warranty of 24 months on these products. For the current warranty conditions, visit the Sennheiser website:
- Australia: https://en-au.sennheiser.com
- New Zealand: https://en-nz.sennheiser.com
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:
- Australia: https://en-au.sennheiser.com
- New Zealand: https://en-nz.sennheiser.com
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.




















