Sennheiser IE 900

Flagship In-Ear Headphone


Sennheiser IE 900 £1,299.00

Experience peak German audio engineering

The precision-manufactured aluminum housing of the IE 900 protects the dynamic TrueResponse transducers, which are essential to Sennheiser’s innovative X3R technology.

The IE 900 — Goodbye to Tradeoffs

The IE 900 unveils the full potential of any recording. In a masterpiece, this becomes evident. It offers brilliant, sparkling treble without sibilance.

High-fidelity recordings are akin to pieces of art. Similar to valuable paintings, ensuring their protection during transport is crucial. The IE 900 showcases the true potential of any recording. Masterpieces shine through with brilliant, sparkling treble and no sibilance. The lows are powerful, avoiding muddiness in the mids. Its ability to resolve fine detail, while maintaining warmth and comfort for extended listening, comes from inspired engineering. Consider the enhanced 7 mm transducer from Sennheiser, specifically improved for the IE 900. The all-new X3R triple-chamber absorber technology, integrated into the solid aluminum core, creates an acoustic vortex. These innovations collectively deliver unparalleled balance and transparency, eliminating the need for compromise.

Explore Every Last Detail

The German-engineered TrueResponse driver in the IE 900 ensures exceptionally natural sound reproduction.

A New Level of Clarity

The IE 900 features a single dynamic driver of the highest quality. The inherent compromises of multi-driver systems, such as phase issues and distortion, led to the decision for a singular dynamic driver of exceptional quality in the IE 900. To refine the sound, a system of three Helmholtz resonators, integral to the X3R technology, is incorporated into the earphone’s aluminum housing. These resonators eliminate resonance peaks, maintaining the integrity of the sound. Additionally, a complex structure in each earphone’s nozzle, termed the Vortex, manages acoustic energy to smooth out peaks.

An Acoustic Back-Volume Establishes Balance

To achieve transparent sound with balanced lows and mids, an acoustic back volume is employed. This feature, a chamber within a chamber, is tuned to control the bass lift’s slope and amplitude. This back volume contributes to a clear, natural sound signature by managing air movement through the transducer system. The result is a disciplined bass and mid-range experience, free from resonances and listening fatigue.

The Sound of Manufacturing Expertise

The IE 900 is crafted at Sennheiser’s state-of-the-art audiophile manufacturing plant in Ireland, also responsible for the HD 800S, HD 820, HD 650, and HD 600. Aluminum was chosen for its suitability for high-precision milling and aesthetic appeal. Each housing is CNC machined from a block of aluminum, resulting in a durable, wear-resistant product. During manufacturing, the drivers in each IE 900 pair are matched to ensure a gapless, transparent soundstage.


  • A new benchmark in portable sound reproduction
  • Developed in Germany and manufactured at Sennheiser’s state-of-the-art Ireland plant
  • Helmholtz resonator chambers unmask critical audio details, even during extended listening sessions
  • Gold-plated Fidelity (+) MMCX connectors for improved stability
  • Adjustable ear hooks and choice of ear adapters including memory foam
  • THD: 0.05% (1 kHz, 94 dB)
  • Unrivalled precision & craftsmanship
  • X3R TrueResponse transducer technology for balanced sound with ultra-revealing detail
  • Precision-milled and anodized aluminum housing
  • Choice of para-aramid reinforced cables (2.5 mm, 3.5 mm, 4.4 mm)
  • Frequency response: 5 Hz – 48,000 Hz
  • Impedance: 18 ohms



5 Years