IE 900 - The purest, most natural sound. 
 
Experience peak German audio engineering
The precision-manufactured aluminum housing of the IE 900 faithfully protects the dynamic TrueResponse transducers at the heart of Sennheiser’s innovative X3R technology.
 
Behind the scenes of the IE 900
How every detail matters to achieve the most coherent and detailed sound experience.
The IE 900 — goodbye to tradeoffs
 
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.
 
Explore every last detail
Our German-engineered TrueResponse driver ensures exceptionally natural reproduction.
 
A new level of clarity
A single dynamic driver only — of the highest quality, of course.
 
Features
A new benchmark in portable sound reproduction
Unrivaled precision & craftsmanship
Developed in Germany and manufactured at our state-of-the-art Ireland plant
X3R TrueResponse transducer technology for balanced sound with ultra-revealing detail
Helmholtz resonator chambers unmask critical audio details, even during extended listening sessions
Precision-milled and anodized aluminum housing
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: 18 ohms
 
An acoustic back-volume establishes balance
To ensure accuracy across this critical frequency band, we’ve employed what is known as an acoustic back volume.
 
The sound of manufacturing expertise
We build the IE 900 at our state-of-the-art audiophile manufacturing plant in Ireland.
 
A precise fit for precise sound
We took the comfort and secure fit of these professional solutions as inspiration for the IE 900.
 
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.
 
Sophisticated one-piece aluminum housing
7 mm TrueResponse transducers
X3R Triple–resonator chamber technology
Treble detail and soundstage well suited for classical music
2.5, 3.5 and 4.4-mm cable / MMCX connector
Premium carry case