Sennheiser IE 900

The Sennheiser IE 900 are reference in-ear earphones with X3R technology: the 7 mm TrueResponse transducer is paired with three Helmholtz resonators milled directly into the aluminium housing, which eliminate resonance peaks. The housing is milled from a single block of aluminium, the earphones are made at Sennheiser’s plant in Ireland and the transducers are matched during manufacturing. Frequency response 5–48,000 Hz, gold-plated Fidelity+ MMCX connectors and three cables in the box – balanced 2.5 mm and 4.4 mm and unbalanced 3.5 mm.

The purest, most natural sound

The IE 900 reveal the true potential of any recording: brilliant treble with no sibilance, powerful lows that never muddy the mids, and the ability to resolve even the finest details.

X3R7 mm XWB5–48,000 Hz123 dB2.5 / 3.5 / 4.4 mmMMCX Fidelity+

X3R technology

Three Helmholtz resonators milled directly into the aluminium housing eliminate resonance peaks that would colour the sound. In addition, the Vortex structure in the nozzle of each earphone swirls acoustic energy in these bands to smooth out the remaining peaks.

A single dynamic transducer

Multi-driver systems bring phase issues and distortion in overlapping frequency bands. That is why the IE 900 rely on a single 7 mm extra-wideband TrueResponse transducer (XWB), which Sennheiser further refined for this model.

Housing from a single block of aluminium

A five-axis CNC machine cuts each housing individually from a single block of aluminium. Once anodized, the housing is highly resistant to wear and corrosion.

Three cables in the box

An unbalanced cable with a 3.5 mm jack for headphone amps, laptops and audio interfaces, plus balanced 2.5 mm and 4.4 mm cables for connecting directly to hi-fi components with balanced outputs.

Acoustic back volume

A small chamber within a chamber manages the slope and amplitude of the bass lift and clearly separates lows from mids.

Matched transducers

The transducers in each pair are matched during automated manufacturing, practically eliminating variance between them.

5–48,000 Hz response

The frequency response extends from 5 Hz to 48,000 Hz, with total harmonic distortion of just 0.05% (1 kHz, 94 dB).

Serialized carry case

Store the earphones and cables in the supplied serialized carry case; the presentation box also contains a signed certificate.

Goodbye to trade-offs

A high-fidelity recording is a work of art, and the IE 900 deliver it without damage. If it is a masterpiece, you will hear it: brilliant treble with no trace of sibilance, powerful lows that never muddy the mids, and warm, comfortable sound even during long sessions.

Made in Ireland

The IE 900 are built at Sennheiser’s audiophile manufacturing plant in Ireland – the same facility that builds the HD 800 S, HD 820, HD 650 and HD 600. Aluminium is well suited to high-precision milling and gives the electro-acoustic components an aesthetically pleasing, long-lasting housing.

A precise fit for precise sound

The inspiration came from the professional in-ear monitoring systems used by musicians. Adjustable ear hooks adapt to the natural shape of the ear, and the box includes silicone and foam ear adapters, both in sizes S, M and L. The earphones are at home at your desk, on a train or on a walk through the woods.

Connections made to last

Gold-plated Fidelity+ MMCX connectors ensure reliable contact and sit in a recessed 4.8 mm-wide socket below the surface of the housing, which protects them from bending. The para-aramid reinforced cables withstand many thousands of bend cycles.