Sennheiser IE900

Defined by its groundbreaking, original work on headphones, Sennheiser miniaturises its progress for a flagship IEM. There's nothing small about this flagship as a technical feat, though.

Its baseline begins with a 7mm dynamic driver termed TrueResponse® XWB (Extra Wide Bandwidth). It's all about the ends of the earth, and the frequency extremes, that defines IE900's ambitions.

It's remarkable how the legendary Sennheiser soundstage shows up and casts itself into the expanse, far beyond the confines of minute shells CNC-carved in Germany from a single block of aluminium. 

IE900's single driver does the work of many, with a pure and fast bass reminiscent of the kind produced by the best balanced armatures. XWB doesn't do it alone; it receives some help from a special Sennheiser back-shell cavity. Supplying enough air volume to produce low notes, IE900 balances the perfect amount of quantity and quality.

Quality is the word that comes to mind perceiving this flagship's highs. Experience with helmholtz resonators in the HD800S allowed Sennhesier to target unwanted resonances and grain. Clean treble is the word, as detail in your music soars effortlessly up and into the ether.

IE900 drew praise from Headfonia for living up to the expectations of a big release from a big company – it was named the publication's Best UIEM of 2021.

With included 2.5mm and 4.4mm balanced cables, it's an IEM that both the audiophile and mainstream market can appreciate, justified by What Hi-Fi?'s 5 ⭐ award. It's Alpha Approved on Alpha Audio NET.

StereoNET give IE900 an Applause Award for an "incredibly detailed, airy, lean, clinical music listening experience" – it made the same publication's Products of the Year shortlist 2021 later.

This is performance you can achieve by browsing the music players that would give you glorious musical satisfaction together here. Begin with Cayin Audio's R2R RU6 and tube N3Pro, iBasso Audio's DX240 or Questyle Audio's QP2R, as instant, synergistic, matches.

Otherwise, view Sennheiser's other living legends here, or the rest of our earphones here.