Audio T Verdict
The Sennheiser IE 900 sit at the top of the company's wired in-ear range, but what makes them interesting is not an enormous collection of miniature drivers. Quite the opposite. Sennheiser sticks with one tiny 7mm dynamic transducer and then surrounds it with some very sophisticated acoustic engineering.
The X3R system combines that TrueResponse driver with three precisely formed resonator chambers and an acoustic vortex, all working to control troublesome high-frequency resonances before they can mask the fine detail in a recording. Add the beautifully machined aluminium housings and the result is an in-ear headphone capable of enormous resolution without simply turning up the treble to make itself sound impressive.
You also get all three useful cable connections in the box: conventional 3.5mm plus balanced 2.5mm and 4.4mm. They are easy enough to drive from a good portable source, although their resolving ability means the quality of that source matters. If you want Sennheiser's most ambitious interpretation of compact, passive wired listening, the IE 900 remain the model to beat within the range.
Fit Comes Before Everything Else
The IE 900 rely on the ear tips forming a proper seal with the ear canal. If they sound thin, unusually bright or short of bass, try another ear-tip size or switch between silicone and memory foam before changing your source or amplification. Even the finest in-ear headphone cannot perform correctly with a poor seal.
Sennheiser IE 900 In-Ear Headphones
The Sennheiser IE 900 are flagship wired in-ear headphones built around the company's 7mm Extra Wide Band TrueResponse dynamic transducer and proprietary X3R acoustic system.
Each earpiece is precision-milled from aluminium and contains three Helmholtz resonator chambers together with an acoustic vortex in the nozzle. These structures are designed to control resonances that could otherwise mask fine high-frequency information.
Unlike many high-end in-ear monitors, the IE 900 do not divide the music between several drivers and crossover networks. A single dynamic transducer reproduces the complete frequency range, helping maintain phase coherence and a consistent acoustic character from bass through to treble.
- Flagship Sennheiser wired in-ear headphones
- Single 7mm Extra Wide Band dynamic transducer
- TrueResponse transducer technology
- X3R acoustic system
- Three Helmholtz resonator chambers per earpiece
- Integrated acoustic vortex
- One-piece precision-milled aluminium housings
- 5Hz to 48kHz frequency response
- 16-ohm current specified impedance
- 123dB SPL at 1kHz / 1V RMS
- Less than 0.05% THD
- Closed in-ear acoustic design
- Passive acoustic attenuation
- Gold-plated Fidelity+ MMCX connectors
- Recessed MMCX connection for additional stability
- Para-aramid reinforced cables
- 2.5mm balanced cable supplied
- 3.5mm conventional cable supplied
- 4.4mm balanced cable supplied
- 1.25m cable length
- Silicone ear adapters in S, M and L
- Memory-foam ear adapters in S, M and L
- Adjustable ear hooks
- Premium carry case supplied
- Developed in Germany
- Current production in Ireland
X3R TrueResponse Technology
The X3R system is the defining acoustic technology within the IE 900.
It starts with Sennheiser's single 7mm TrueResponse dynamic transducer and adds three precisely tuned Helmholtz resonator chambers between the diaphragm and the nozzle.
The aim is not simply to increase treble output. The resonators are designed to absorb particular unwanted peaks so that quieter information elsewhere in the upper frequencies remains easier to hear.
Three Helmholtz Resonator Chambers
Each IE 900 earpiece contains three resonator chambers machined directly into the aluminium acoustic structure.
Each chamber is tuned to address a particular resonance, and all three must work together as part of the complete response.
Sennheiser specifically developed the system to smooth resonances in the region where strong peaks can interfere with our perception of finer high-frequency detail.
What Is a Helmholtz Resonator?
A Helmholtz resonator is a carefully sized cavity with an opening that naturally responds to a particular frequency range.
By tuning the size and geometry of the chamber, acoustic energy at an unwanted resonance can be controlled instead of simply travelling straight down the earphone nozzle towards the listener.
The IE 900 use three such chambers rather than one.
Why Control Resonance Instead of Simply Reducing Treble?
A broad treble reduction would also remove information you actually want to hear. The X3R system targets specific resonant behaviour instead, helping preserve detail while reducing the peaks that can make high frequencies sound aggressive or obscure quieter information nearby.
Reducing Frequency Masking
Frequency masking occurs when a louder sound makes a quieter nearby frequency more difficult for the human ear to perceive.
The quieter information is still present in the recording, but a sufficiently strong resonance can effectively hide it from us.
Sennheiser's resonator system reduces the energy associated with those resonances, helping reveal subtle information that might otherwise be lost behind them.
The Acoustic Vortex
The three resonator chambers are complemented by an acoustic vortex within the nozzle.
This complex internal shape increases acoustic friction so that excess high-frequency energy is scattered and controlled before reaching the ear canal.
Together, the vortex and resonator chambers form the complete X3R acoustic system.
Why the Vortex Matters
High-frequency tuning in an in-ear headphone can be particularly difficult because the sound is delivered directly into a very small acoustic space.
Minor resonances that might be relatively insignificant in a large loudspeaker system can become much more obvious inside an ear canal.
The acoustic vortex gives Sennheiser another purely mechanical way of controlling that energy without resorting to electronic equalisation.
The Single-Driver Principle
Many premium in-ear monitors advertise increasingly large numbers of drivers.
Sennheiser takes a different approach with the IE 900.
One dynamic transducer reproduces everything from the lowest bass to the highest treble.
Why Not Use Multiple Drivers?
Multi-driver designs can work extremely well, but they also introduce additional engineering challenges.
Different drivers normally cover different parts of the frequency range, requiring crossover filters and careful acoustic alignment so that their outputs combine correctly.
Potential issues include:
- Phase differences between drivers
- Crossover interaction
- Overlapping frequency bands
- Different transient behaviour
- More complex acoustic integration
The IE 900 avoid those crossover points entirely by asking one carefully developed driver to reproduce the complete signal.
Driver Count Is Not a Quality Rating
A headphone with five drivers is not automatically better than one with a single driver. Sennheiser's approach is to maximise the performance of one 7mm dynamic transducer and then use the surrounding acoustic structure to control its behaviour.
7mm Extra Wide Band Transducer
The 7mm dynamic driver is an evolution of Sennheiser's long-running audiophile in-ear transducer technology.
Despite its tiny dimensions, it is designed to reproduce a frequency range extending from deep bass into the ultrasonic region while maintaining extremely low distortion.
The lightweight diaphragm also allows rapid acceleration and deceleration as the musical signal changes.
A Tuned Acoustic Back Volume
The space behind the driver is part of the acoustic design rather than simply an empty cavity inside the housing.
Sennheiser tunes this rear volume to establish the correct balance between the driver's low-frequency behaviour and the rest of the spectrum.
The back volume works together with the X3R chambers and nozzle geometry as one complete acoustic system.
5Hz to 48kHz Frequency Response
Sennheiser specifies the IE 900 from 5Hz to 48kHz.
The upper figure extends well beyond the conventional range of human hearing, but the useful point is that the transducer operates over a very wide bandwidth rather than working close to its mechanical limits throughout the audible range.
Deep, Controlled Bass
The IE 900 are capable of substantial low-frequency extension, but the emphasis is on definition rather than simply making the bass louder.
A good recording should allow you to distinguish the pitch, texture and decay of individual bass events rather than hearing them as one continuous low-frequency weight.
This is particularly useful with:
- Bass guitar
- Double bass
- Kick drums
- Electronic sub-bass
- Low piano notes
- Organ
- Orchestral percussion
Midrange Clarity
Keeping bass under control also helps protect the lower midrange from being masked by excessive warmth.
Vocals, guitars, piano and acoustic instruments can therefore remain clearly defined instead of being pushed backwards behind an exaggerated low end.
Treble Detail Without Simply Adding Brightness
The X3R system is particularly concerned with the behaviour of the upper frequencies.
The objective is to uncover information such as cymbal texture, ambience, string harmonics and reverberation by removing problematic resonances rather than simply increasing overall treble level.
That distinction is important during long listening sessions, where an artificially elevated high-frequency response can quickly become tiring.
Less Than 0.05% Distortion
Sennheiser specifies total harmonic distortion below 0.05% at 1kHz and 94dB.
Low distortion helps prevent the transducer from adding unwanted harmonic information that could mask subtle details already contained in the recording.
123dB SPL Sensitivity
The IE 900 are highly sensitive, with Sennheiser specifying 123dB SPL at 1kHz and 1V RMS.
That means they require relatively little voltage to achieve normal listening levels.
For this reason, source quality and low background noise are generally more important than chasing extremely powerful headphone amplification.
16-Ohm Impedance
Sennheiser's current technical specification lists the IE 900 at 16 ohms.
This low impedance makes them practical with a broad range of portable equipment, provided the source has a clean, well-designed headphone output.
Do the IE 900 Need a Headphone Amplifier?
Not simply to make them loud.
The IE 900 are sensitive and low impedance, so a good portable player or USB DAC should have no difficulty driving them.
Where a better source can help is through:
- Lower background noise
- Lower distortion
- Better channel separation
- More precise volume control
- Improved output-stage quality
Quality Matters More Than Raw Power
With highly sensitive in-ear headphones, an extremely powerful amplifier can actually be less useful if it introduces audible hiss or makes fine volume adjustment difficult. Look for a quiet source with good low-impedance performance rather than simply the biggest output figure.
Passive Acoustic Isolation
The IE 900 use a closed in-ear design and rely on the ear adapters to create a physical seal in the ear canal.
There is no electronic Active Noise Cancellation.
This means the level of outside-noise reduction depends heavily on selecting the correct ear-tip size and material.
Silicone and Memory-Foam Ear Adapters
Six pairs of ear adapters are supplied in total.
- Small silicone
- Medium silicone
- Large silicone
- Small memory foam
- Medium memory foam
- Large memory foam
Silicone or Memory Foam?
The silicone tips are quick to fit, easy to clean and simple to reuse.
Memory foam can conform more closely to the shape of the ear canal after being compressed for insertion and may provide a different combination of comfort, isolation and bass response.
There is no universally correct option, so it is worth trying both.
Adjustable Ear Hooks
The cables route over the ears using flexible adjustable sections.
This helps support each earpiece and reduces the amount of cable weight pulling directly down on the ear canal.
The arrangement is influenced by professional in-ear monitor designs where secure fit is particularly important.
Precision-Milled Aluminium Housings
The IE 900 enclosures are precision-milled from aluminium rather than moulded from conventional plastic.
The manufacturing process allows the complex internal resonator chambers and acoustic vortex to be formed with the accuracy required by the X3R system.
The metal construction also creates a rigid and durable enclosure around the transducer.
One-Piece Acoustic Structure
Machining the housing and resonator geometry as an integrated structure helps minimise variation between individual earpieces.
This matters because even small changes in the dimensions of a Helmholtz resonator can alter the frequency at which it operates.
Developed in Germany, Manufactured in Ireland
The IE 900 were originally produced in Germany when first introduced.
Current Sennheiser information now describes the model as developed in Germany and manufactured at its specialist audiophile production facility in Ireland.
The location has changed during the life of the product, but the fundamental X3R design and article number remain the same.
Fidelity+ MMCX Connections
The detachable cables connect through gold-plated MMCX interfaces.
Sennheiser recesses the connectors deeper into the earpiece housing than on a conventional exposed MMCX socket to provide additional mechanical stability.
Sennheiser refers to this implementation as Fidelity+ MMCX.
Use Compatible IE-Series MMCX Cables
The electrical connection is MMCX, but the socket is recessed into the IE 900 housing. A generic MMCX cable may therefore not fit correctly even if the connector looks similar. Use cables specifically listed as compatible with the Sennheiser IE Series.
Three Cables Included
The IE 900 package is unusually comprehensive when it comes to source connections.
Sennheiser supplies:
- 2.5mm balanced cable
- 3.5mm conventional cable
- 4.4mm balanced cable
All three use para-aramid reinforcement and gold-plated MMCX connectors at the earpiece end.
3.5mm Conventional Cable
The 3.5mm cable provides the broadest compatibility.
It can connect to suitable:
- Portable DACs
- Digital audio players
- Headphone amplifiers
- Laptops
- Audio interfaces
- Phones and tablets using a compatible headphone adapter
4.4mm Balanced Cable
The supplied 4.4mm cable connects directly to the increasingly common Pentaconn balanced output found on higher-quality portable players and headphone amplifiers.
Because it is supplied as standard, there is no need to purchase another cable simply to use a compatible 4.4mm output.
2.5mm Balanced Cable
Sennheiser also includes the smaller 2.5mm balanced connection.
This remains useful with digital audio players and portable equipment designed around the earlier 2.5mm four-pole balanced standard.
Does Balanced Automatically Sound Better?
No.
A balanced connection can provide advantages where the source equipment has been specifically designed to perform best through that output, but the plug itself does not guarantee better sound.
The IE 900 simply give you all three major connection formats so you can choose the one most appropriate to your equipment.
Para-Aramid Cable Reinforcement
The supplied cables use para-aramid reinforcement to improve resistance to repeated bending and everyday handling.
This is useful on portable earphones, where the cable naturally experiences considerably more movement than the cable behind a stationary home hi-fi component.
Replaceable Cables
Current Sennheiser service support includes replacement 2.5mm, 3.5mm and 4.4mm IE 900 cables.
A damaged cable therefore does not mean replacing the entire pair of earphones.
Optional Microphone Cable
Sennheiser now also offers a compatible 3.5mm IE-Series microphone cable.
This can add wired headset functionality if required without permanently changing the standard music-listening configuration.
Replaceable Individual Earpieces
Sennheiser's current service catalogue even lists left and right IE 900 earpieces separately for specialist service requirements.
Replacement ear adapters and cables are also available, supporting long-term ownership of the product.
Premium Carry Case
A dedicated carry case is included for storing the IE 900 and cables when they are not being used.
This is particularly useful with a portable product whose precision-machined earpieces and multiple cables deserve more protection than simply being placed loose in a bag.
Cleaning Tool Included
Sennheiser supplies a cleaning tool to help maintain the earphone nozzles and ear adapters.
Keeping an in-ear headphone clean is important not only for hygiene but also because debris around the acoustic opening can affect performance.
IE 900 or IE 600?
IE 900
- Flagship IE Series model
- 7mm XWB TrueResponse driver
- Precision-milled aluminium housing
- X3R triple-resonator system
- Three Helmholtz chambers
- Acoustic vortex
- 5Hz to 48kHz response
- 16-ohm current technical specification
- 123dB SPL
- Less than 0.05% THD
- 2.5mm cable supplied
- 3.5mm cable supplied
- 4.4mm cable supplied
IE 600
- Premium IE Series model
- 7mm TrueResponse driver
- ZR01 amorphous zirconium housing
- D2CA dual-resonator system
- 4Hz to 46.5kHz response
- 18-ohm system impedance
- 118dB SPL
- Less than 0.06% THD
- 3.5mm cable supplied
- 4.4mm cable supplied
- 2.5mm available separately
What Does the IE 900 Add?
The Sennheiser IE 600 already take the single-driver TrueResponse philosophy to a very high level.
The IE 900 move to Sennheiser's more elaborate X3R system, using three resonator chambers rather than two, adding the acoustic vortex and employing a precision-milled aluminium enclosure.
A third 2.5mm balanced cable is also included.
The IE 600 may well represent the sweet spot for many systems, while the IE 900 are aimed at listeners who want the most developed version of Sennheiser's current wired in-ear philosophy.
IE 900 or IE 200?
The Sennheiser IE 200 offer a much more accessible route into the same basic single dynamic-driver philosophy.
They use a lightweight polymer enclosure and a clever dual-tuning ear-tip arrangement rather than the elaborate resonator technology found in the flagship model.
The IE 900 add a far more sophisticated acoustic structure, precision aluminium construction, wider bandwidth, lower distortion and all three common cable formats in the box.
The IE Series Philosophy
Across the IE 200, IE 600 and IE 900, Sennheiser maintains a consistent belief in using one carefully controlled dynamic transducer rather than increasing driver count as the models become more expensive.
The progression instead comes largely from:
- Housing construction
- Acoustic resonator technology
- Mechanical tolerances
- Frequency-response control
- Supplied cables
- Overall refinement
Portable Reference Listening
The IE 900 allow an extremely revealing headphone system to occupy remarkably little physical space.
Partner them with a good portable digital audio player or USB DAC and the complete system can fit easily into a pocket or small bag.
Excellent for Travel
The closed in-ear fit reduces surrounding noise without batteries or ANC processing, while the supplied case protects the earphones between listening sessions.
There is no battery-runtime concern with the IE 900 themselves, although the phone, player or DAC naturally still requires power.
Excellent at a Desk
The IE 900 can also serve as an alternative to full-sized reference headphones where space is limited.
A compact DAC or headphone amplifier can create an extremely capable desktop system without requiring large earcups or a headphone stand.
Excellent for Classical and Acoustic Music
The ability to resolve fine upper-frequency information and maintain clear separation between instruments suits naturally recorded music particularly well.
String harmonics, hall ambience and small variations in instrumental texture can all benefit from the control provided by the X3R acoustic system.
Excellent for Electronic Music
The combination of genuine low-frequency extension and fast single-driver behaviour also works extremely well with electronic music.
Deep synthesiser notes can retain their weight without overwhelming the detail in the middle and upper frequencies.
Revealing of Recording Quality
Flagship headphones rarely make every recording sound automatically better.
The IE 900 can expose aggressive mastering, excessive compression or poor source material precisely because they retrieve so much information.
That transparency is part of their appeal, but it is worth considering if you prefer headphones that deliberately soften difficult recordings.
No Bluetooth, Batteries or DSP
The IE 900 are completely passive wired headphones.
There is no:
- Bluetooth codec
- Rechargeable battery
- Active Noise Cancellation
- Digital signal processing
- Firmware
- Companion app
The signal path is determined by your source, cable and the mechanical acoustic system inside the earphones.
Built for Long-Term Ownership
The absence of an integrated battery or wireless electronics removes two of the components most likely to become obsolete in a modern portable headphone.
Detachable cables, replaceable ear adapters and current Sennheiser service support add to the long-term ownership proposition.
Who Are the Sennheiser IE 900 For?
- Listeners wanting Sennheiser's flagship wired in-ear headphone
- People looking for maximum detail from a compact system
- Portable hi-fi listeners
- Digital audio player users
- Portable DAC users
- Listeners who prefer single-driver coherence
- Listeners wanting high-quality passive isolation
- Classical and acoustic music listeners
- Electronic music listeners
- People wanting 2.5mm, 3.5mm and 4.4mm cables included
- Listeners wanting replaceable MMCX cables
- Existing IE 600 owners considering the flagship model
- People who do not want batteries, Bluetooth or apps
Who Are They Not For?
- People wanting wireless headphones
- Listeners wanting Active Noise Cancellation
- People who dislike inserting earphones into the ear canal
- Customers wanting a microphone supplied as standard
- Listeners wanting touch controls
- People wanting app-based EQ
- Listeners who prefer a deliberately forgiving presentation
- People who will not benefit from the additional refinement over the IE 600
Key Features
- Sennheiser IE 900
- Article number 508949
- Flagship wired in-ear headphones
- Closed acoustic design
- Ear-canal coupling
- Single dynamic driver
- 7mm Extra Wide Band transducer
- TrueResponse technology
- X3R acoustic system
- Three Helmholtz resonator chambers
- Integrated acoustic vortex
- Tuned acoustic back volume
- Precision-milled aluminium housings
- 5Hz to 48kHz frequency response
- 16-ohm current technical specification
- 123dB SPL at 1kHz / 1V RMS
- Less than 0.05% THD
- Passive acoustic attenuation
- Fidelity+ MMCX connection
- Gold-plated MMCX contacts
- Recessed connector design
- Para-aramid reinforced cables
- 1.25m cable length
- 2.5mm balanced cable supplied
- 3.5mm conventional cable supplied
- 4.4mm balanced cable supplied
- Silicone tips in S / M / L
- Memory-foam tips in S / M / L
- Adjustable ear hooks
- Premium carry case
- Cable clip supplied
- Cleaning tool supplied
- Signed customer certificate
- Developed in Germany
- Current manufacture in Ireland
- No Bluetooth
- No battery
- No Active Noise Cancellation
- No app required
- 24-month manufacturer's warranty
Frequently Asked Questions
Are the Sennheiser IE 900 still current?
Yes. The IE 900 remain Sennheiser's current flagship wired in-ear headphone model.
Is the correct name IE900 or IE 900?
Sennheiser's official product styling is IE 900.
What size driver do the IE 900 use?
Each earpiece uses a single 7mm Extra Wide Band TrueResponse dynamic transducer.
What is X3R?
X3R combines the 7mm TrueResponse transducer with three Helmholtz resonator chambers and an acoustic vortex to control resonances and reveal fine high-frequency information.
Why are there three resonator chambers?
Each chamber is tuned to help control particular unwanted high-frequency resonances. Together they smooth the response and reduce frequency masking.
What does the acoustic vortex do?
The internal vortex increases acoustic friction and scatters excess high-frequency energy, complementing the three resonator chambers.
Why does the IE 900 use only one driver?
Sennheiser's single-driver approach avoids the crossover and phase-integration challenges that can accompany multi-driver in-ear designs.
Are the housings aluminium?
Yes. The IE 900 use one-piece precision-milled aluminium housings.
What is the frequency response?
5Hz to 48kHz.
What impedance are the IE 900?
Sennheiser's current technical specification table lists 16 ohms.
How sensitive are they?
Sennheiser specifies 123dB SPL at 1kHz and 1V RMS.
What is the total harmonic distortion?
Less than 0.05% at 1kHz and 94dB.
Do the IE 900 need a headphone amplifier?
Not simply for volume. They are sensitive and low impedance, but their resolving ability means they benefit from a quiet, high-quality headphone output or portable DAC.
Can I use them with a phone?
Yes, provided the phone has a suitable headphone output or you use a compatible USB-C or other external headphone DAC.
Do the IE 900 have Active Noise Cancellation?
No. Isolation comes entirely from the closed in-ear design and ear-tip seal.
Do they have Bluetooth?
No.
Do they need charging?
No. They are completely passive wired headphones.
What ear tips are supplied?
Silicone and memory-foam ear adapters are supplied in Small, Medium and Large sizes.
Which ear tips should I use?
Whichever size and material creates a comfortable and consistent seal. A poor seal can substantially reduce bass response.
Are the cables detachable?
Yes. The IE 900 use Sennheiser's recessed Fidelity+ MMCX connection.
Can I use any MMCX cable?
Not necessarily. The connectors are recessed into the housings, so use a cable specifically confirmed as mechanically compatible with the Sennheiser IE Series.
How many cables come with the IE 900?
Three.
What cable connections are included?
2.5mm balanced, 3.5mm conventional and 4.4mm balanced.
How long are the cables?
Approximately 1.25 metres.
Are the cables reinforced?
Yes. Sennheiser uses para-aramid reinforcement.
Does balanced automatically sound better?
No. Its benefit depends on how the source or headphone amplifier implements its balanced output.
Can I add a microphone?
Yes. Sennheiser currently lists an optional 3.5mm microphone cable as compatible with the IE 900.
Can replacement cables be purchased?
Yes. Sennheiser currently lists replacement 2.5mm, 3.5mm and 4.4mm cables.
Can replacement ear tips be purchased?
Yes. Compatible silicone and memory-foam adapters remain available.
Where are the current IE 900 made?
Sennheiser currently describes the IE 900 as developed in Germany and manufactured at its audiophile production facility in Ireland.
Were older IE 900 made in Germany?
Yes. The original production launched from Sennheiser's German facility. Current manufacturing information specifies Ireland.
What is the difference between IE 900 and IE 600?
Both use Sennheiser's single dynamic-driver philosophy, but the IE 900 add precision-milled aluminium housings, the X3R triple-resonator system and acoustic vortex. They also include 2.5mm, 3.5mm and 4.4mm cables, whereas the IE 600 standard package includes 3.5mm and 4.4mm.
What is the difference between IE 900 and IE 200?
The IE 200 provide a much more affordable route into Sennheiser's single-driver in-ear approach. The IE 900 use considerably more sophisticated acoustic-control technology, aluminium housings and a much more comprehensive cable package.
Are the IE 900 suitable for travel?
Yes. They are compact, require no battery and provide useful passive isolation with a correct fit.
Are the IE 900 suitable for classical music?
Yes. Their resolution, controlled high frequencies and ability to reveal spatial and tonal detail make them particularly well suited to high-quality classical and acoustic recordings.
Are the IE 900 waterproof?
Sennheiser does not position the IE 900 as waterproof sports earphones, so they should be protected from excessive moisture.
How long is the manufacturer's warranty?
The IE 900 currently fall within Sennheiser's 24-month consumer warranty category, subject to the applicable warranty terms and proof of purchase.
What comes in the current UK box?
The current Sennheiser UK package lists the IE 900 earphones, 2.5mm balanced cable, 3.5mm conventional cable, 4.4mm balanced cable, silicone tips in S / M / L, foam tips in S / M / L, premium carry case, cable clip, cleaning tool, presentation box, signed customer certificate and user manuals.
Related Sennheiser Products and Audio T Guides
Why Buy the Sennheiser IE 900 From Audio T?
At this level, specification alone should not decide which in-ear headphones you buy. Fit, source equipment and personal tonal preference all matter, and the differences between the IE 600 and IE 900 are best understood by listening wherever possible.
Audio T can help you compare the IE Series, choose a suitable portable DAC or headphone amplifier and decide whether the supplied conventional or balanced cable makes the most sense for your equipment.
- Friendly specialist headphone advice
- IE 200, IE 600 and IE 900 comparisons
- Portable DAC advice
- Headphone amplifier matching
- Low-impedance headphone guidance
- 2.5mm balanced connection advice
- 3.5mm conventional connection advice
- 4.4mm balanced connection advice
- MMCX cable compatibility guidance
- Ear-tip and fit advice
- Demonstrations where available
- Ongoing after-sales support
Contact your local Audio T store if you would like to arrange a demonstration or discuss whether the Sennheiser IE 900 are the right earphones for your source and listening habits.