Astell&Kern AK T9iE High-Fi In-Ear Monitor (IEM)


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Astell&Kern and Beyerdynamic have teamed up to produce another high-fi IEM. Featuring top-of-the-line cables and an acoustic vent port, these gorgeous in-ears produce clarified bass and neutral treble without a whiff of distortion. 

Acoustic Vent Port

While no one is claiming that the AK T9iE is an open-back IEM, the enlarged vent hole in the middle of the cover plate acts as a sort of blowhole through which excess bass can escape. What does this mean? It means that these IEMs deliver precise, unmuddied bass without bugging your deskmate. 

Two-Layer Acoustic Filter

The unfortunate thing about having ears is the earwax they produce. No, the AK T9iE won’t clean your ears for you, but they do protect themselves with a two-layer acoustic filter (that also produces pure, neutral treble). 

Silver and Copper Hybrid Cable

By delegating bass frequencies to a 7N OCC copper wire and high-end frequencies to a 4N pure silver wire, the T5p achieves a balanced sound profile. No ear-splitting highs or aggressive, muddy bass. Just perfect clarity. 


  • Transducer type: Dynamic

  • Operating principle: Closed

  • Frequency response: 8 – 48,000 Hz

  • Impedance: 16 Ω

  • Total harmonic distortion: <0.2%

  • Power handling capacity: 10 mW

  • Cable: 4N pure silver and 7N Occ Copper hybrid 2.5mm 4-pole cable

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