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AK T9iETesla Technology, Further Refined




Beyerdynamic + Astell&Kern

Astell&Kern is proud to announce the all-new AK T9iE.

The AK T9iE is the third in-ear collaboration product by Beyerdynamic and Astell&Kern.

Specially tuned for Astell&Kern portable music players, the AK T9iE has an extremely neutral sound signature with soft treble, linear midrange and slightly elevated bass.

The AK T9iE uses Beyerdynamic's patented high-efficiency Tesla Technology and is manufactured by hand in Germany, satisfying the highest standards.



AK T8iE MkⅡ vs. AK T9iE




The acoustic sound signature of AK T9iE

Our target is to make them sound more natural, especially when playing back hi-res audio with Astell&Kern Players. The newly designed acoustic vent port allows for improved bass response and enhanced treble softness by specially engineered two-layer acoustic filter with integral earwax protection.


Internal Structure







New acoustic vent port

The newly designed acoustic vent port has a slightly enlarged vent hole that is located in the middle of the cover plate which allows for a very deep bass that is extremely well controlled.








Two-layer acoustic filter

A specially engineered two-layer acoustic filter is utilized in the sound outlet, different from the AK T8iE MkⅡ, and serves two purposes - protection from earwax and an acoustic filter element which produces very pure and neutral treble.