Tesla technology, further refined
  • Newly designed acoustic vent port for improved bass response
  • Enhanced treble response using a specially engineered acoustic filter with integral earwax protection
  • Pure silver and OCC hybrid cable (2.5mm 4-pole balanced)
  • Tuned for Astell&Kern by beyerdynamic
  • Handmade in Germany
Sale price£1,099.00
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Beyerdynamic + Astell&Kern


Our third collaboration with legendary German headphone specialists Beyerdynamic results is AK T9iE - it’s the most complete in-ear monitor you can buy, regardless of price


Small product, big science

Each AK T9iE earbud consists of seven discrete elements, all specified without compromise and all fitted together, by hand, in Germany. From Beyerdynamic’s patented Tesla magnet assembly to the gold-plated MMCX connectors, AK T9iE is a triumph of technology and design.

Lines of communication

The cable that runs from the AK T9iE earbud to your Astell&Kern digital audio player is similarly overspecified. Silver-plated oxygen-free copper inside non-migration jacketing guarantees the torrents of complex, high-resolution audio information travel exactly as they should, delivering extraordinarily high standards of performance.

How low can you go?

We’ve made the acoustic vent port slightly larger and repositioned it in the middle of the outer cover plate of the earbud. This way the AK T9iE bass response extends all the way down to an ultra-deep 8Hz, is textured and controlled, and loaded with fine detail.

Protect and serve

In collaboration with Beyerdynamic we’ve developed a specially engineered two-way acoustic filter that’s positioned just behind the eartip. As well as offering real neutrality and purity to the treble response, it also offers protection from earwax to the entire assembly.

Contrast of surfaces

Just like our digital audio players, AK T9iE has a strong design identity. As well as being ergonomically ideal for long listening sessions, the jewel-like carved planes on the exterior housing respond differently to changing lighting conditions - making our in-ear monitors look as distinctive as they sound.

AK T9iE - Astell&Kern

Included in the box

  • 2x A&K T9iE earphone housings
  • 1x 2.5mm headphone cable with A2DC headphone connectors
  • 1x 2.5mm to 3.5mm headphone interconnect adapter
  • 6x sizes of silicon ear tips / 3x sizes of comply foam ear tips
  • 1x carry case
General Specifications
Transducer type
Dynamic, moving-coil
Operating principle
Frequency response
8 – 48,000 Hz
16 Ohm
Total harmonic distorsion
<0.2 %
Power handling capacity
10 mW
Sound coupling to the ear
4N pure silver and 7N OCC copper hybrid 2.5mm 4-pole cable