Sennheiser IE 900 In-ear Headphones IEM

A new level of clarity

In developing the IE 900, the Sennheiser engineers faced a fundamental choice. The inherent compromises multi-driver systems require (phase issues and the resulting distortion in overlapping frequency bands) made the decision easy. There would be a single dynamic driver only — of the highest quality, of course.

To get exactly the sound needed for such a precision portable earphone , they designed a sophisticated system of three Helmholtz resonators — a crucial element in the X3R technology - milled right into the solid aluminum housing of each earphone. These tiny channels eliminate resonance peaks which can color the sound signature and alter the feel of your music. In addition, a complex structure in the nozzle of each earphone — the Vortex — swirls acoustic energy in these frequency bands to smooth out peaks.

An acoustic back-volume establishes balance

Our goal was to achieve a transparent sound with no distracting peaks or troughs. One thing this requires is clear separation of lows and mids. To ensure accuracy across this critical frequency band, we’ve employed what is known as an acoustic back volume. It’s a small chamber within a chamber we have tuned to manage the slope and amplitude of the bass lift. The way the back volume helps achieve such a clear and natural sound signature is by controlling the direction and overall volume of air as it moves through the transducer system. What you hear is a pleasantly disciplined bass and mid-range experience. Unpleasant resonances and listening fatigue vanish in this small space with a big effect.

The sound of manufacturing expertise

We build the IE 900 at our state-of-the-art audiophile manufacturing plant in Ireland—the same facility that builds the revered HD 800S, HD 820, HD 650 and HD 600. The use of aluminum was a clear choice: well-suited to high-precision milling, it also provides an aesthetically pleasing, long-lasting home for the electro-acoustic components. A five-axis CNC machine precision cuts each housing individually from a single block of aluminum. The result is truly a work of art. Once anodized, the housing is highly resistant to wear and corrosion — music to the ears of any daily listener. The drivers in each pair of IE 900s are matched during our automated manufacturing process to practically eliminate variance. The result? A transparent soundstage with no gaps or holes.

A precise fit for precise sound

Working musicians rely on high-quality, form fitting earphones known as personal monitoring systems. But we felt the privilege of enjoying perfect live sound should not be the exclusive right of the performers of the world. So, we took the comfort and secure fit of these professional solutions as inspiration for the IE 900. Now you can enjoy a fit and quality that rival that experienced by the artists who create your music. Included with the IE 900 are silicone ear adapters and three elastic foam ear adapter sets in three different sizes. They adapt to the natural shape of your ear for a tailored fit. We’ve all been there: an amazing piece of music spoiled by a recurring bass note that happens to match the resonant frequency of your loudspeakers or headphones. Or rough treble sibilance that makes longer sessions uncomfortable. Such obvious deficiencies are unthinkable with the IE 900. All you will hear is precisely what the artist intended. They’re perfect at your desk, on a train, or taking a walk through the woods. Never have a listening session spoiled by your earphones again.

It pays to have good connections

In addition to outstanding sound, audiophiles appreciate durable products that are made to last. Here as well, the IE 900 excels.
Gold-plated Fidelity+ MMCX connectors ensure perfect contact. Each termination is seated within a recessed, 4.8 mm-wide socket below the surface of the housing, providing strain relief. The cables themselves are para-aramid reinforced to withstand many thousands of bend cycles. But they don’t have to when protected in the included serialized case.
Connect to practically any digital audio source with the 3.5 mm stereo plug including headphone amps, laptops, and audio interfaces. Each pair of IE 900s also includes symmetrical 2.5 mm and 4.4 mm cables for plugging directly into hi-fi components with balanced outputs. Because when you’re looking for the most natural and immersive sound, every detail matters.

What's in the box?

• IE 900 in-ear headphones
• Balanced para-aramid reinforced cable with 2.5mm connector
• Unbalanced para-aramid reinforced cable with 3.5mm connector
• Balanced para-aramid reinforced cable with 4.4mm connector
• 3 pairs of silicone ear adapters (S, M, L)
• 3 pairs of foam ear adapters (S, M, L)
• Premium carry case with metal serial no. plate
• Cable clip, Cleaning tool & Cleaning cloth
• Presentation box with signed customer certificate & User manuals

Technical Data

• Impedance

  18 Ω

• Sound pressure level (SPL)

  123 dB (1 kHz, 1 Vrms)

• THD, total harmonic distortion

  <0.05% (94 dB, 1 kHz)

• • Cable length

    125 cm

  • Transducer principle

    single dynamic driver, pressure chamber

  • Weight

    4 g

  • Technology

    Unique X3R technology

  • Housing

    One-piece precision-milled aluminum housing

  • Warranty

    global 2-year warranty

  • Connector

    Fidelity (+) MMCX

  • Ear coupling

    Ear canal

  • Frequency response

    5 Hz – 48,000 Hz (-10 dB)