Sennheiser IE-900 In-Ear Headphones

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Sennheiser IE-900 In-Ear Headphones

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Key info

  • Developed in Germany and hand-assembled at Sennheiser´s headquarters.
  • X3R TrueResponse transducer technology for balanced sound with ultra-revealing detail.
  • Choice of para-aramid reinforced cables (2.5 mm, 3.5 mm, 4.4 mm).
  • Precision-milled and anodized aluminum housing.
  • Gold-plated Fidelity (+) MMCX connectors for improved stability.

All specifications

Physical characteristics
Shipping Weight 446 g
Shipping dimensions (HxWxD) 350 x 282 x 260 mm
Driver type Single Dynamic driver
Transducer size 7 mm
Impedance 18 ohm
Frequency response 5 Hz – 48,000 Hz (-10 dB)
Connector type MMCX
Cable length 1.25 m
Plug type 2.5mm/3.5mm/4.4mm
THD < 0.05% (1 kHz, 94 dB)
Sound pressure level (SPL) 123 dB (1 kHz, 1 Vrms)
Included accessories
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

The IE 900’s development focused on our demand for perfection and attention to detail. We rose to the challenge and the result is a new dimension in in-ear headphone design and technology that meets even the most ambitious listening expectations.

The IE 900 — goodbye to tradeoff

High-fidelity recordings are pieces of art. Just as with a valuable painting, it would be a disgrace to allow damage during transport. The IE 900 reveals the true potential of any recording. If it’s a masterpiece, you’ll hear it. Brilliant, sparkling treble — with no trace of sibilance. Powerful lows without creating muddy mids. An uncanny ability to resolve fine detail — alongside warmth and comfort for extended sessions.
All these qualities derive from inspired feats of engineering. Take Sennheiser’s trusted 7 mm transducer, for instance. We’ve made it just that much better for the IE 900. Or the all-new X3R triple-chamber absorber technology milled right into the solid aluminum core with its downstream acoustic vortex. Taken together, these innovations deliver a unique level of balance and transparency — so you never have to compromise again.

Explore every last detail

Considerable effort goes into capturing the finest nuances of a musical performance. Re-living the creativity and texture recorded in the studio or concert hall can be a source of great pleasure. But only if the listener’s playback equipment allows. Our German-engineered and manufactured TrueResponse driver ensures exceptionally natural reproduction. A large part of its very precise transient response comes from the unique combination of materials in the diaphragm together with its high inner dampening. So when the signal stops, the sound stops too. This is how the IE 900 can reveal details in tracks you thought you knew inside out.
But the only thing that counts is what you, the listener, hear. The tonality of each instrument becomes clearly audible. And it’s not just the skills of the musicians that the IE 900 reveals. Even the acoustic properties of the room gain a new presence. Instead of remaining on the surface, you can now dive deep into complex passages — all while immersed in a breathtaking sound stage.

Explore every last detail, а new level of clarity

In developing the IE 900, we 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 we were looking for, we designed a sophisticated system of three Helmholtz resonators — the X3R. It’s milled right into the solid aluminum housing of each earphone. These tiny channels eliminate resonance peaks which, in less advanced products, 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.


  • New benchmark in portable audio.
  • Ultimate precision & craftsmanship.
  • Made in Germany.
  • X3R technology: TrueResponse transducer combined with three Helmholtz resonator chambers and acoustic vortex.
  • Precision-milled and anodized aluminum housing.
  • Hand-assembled at Sennheiser´s headquarters.
  • Gold-plated Fidelity ( ) MMCX connectors for improved stability.
  • Choice of para-aramid reinforced cables (2.5 mm, 3.5 mm, 4.4 mm).
  • Adjustable ear hooks and choice of ear adapters including memory foam.
  • Frequency response: 5 Hz – 48,000 Hz.
  • THD: 0.05% (1 kHz, 94 dB).
  • Impedance: 16 ohms.

User reviews

1 review
  1. 5/5

    Nicholas (verified owner)

    Great price. Great next day delivery. Thanks!

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