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Astell & Kern AK T8iE MkII earphones


Astell & Kern

Moon Audio

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The AK T8iE MkⅡ succeeds and improves on the AK T8iE, the world’s first Tesla in-ear headphone, collaboratively developed by Astell & Kern and beyerdynamic.

Absolute Sound Review Sept 2016



The AK T8iE MkⅡ succeeds and improves on the AK T8iE, the world’s first Tesla in-ear headphone, collaboratively developed by Astell&Kern and beyerdynamic. The 2nd generation promises truly outstanding sound and exceptional build quality.

The MkⅡ includes:

  • high-grade silver-plated fiber cables with coaxial construction (an upgrade from copper cables)
  • introduces a new voice-coil, drawing on all of the audio excellence beyerdynamic has pioneered since 1924
  • allows users to experience an extremely wide frequency range, with crisp bass, well-balanced mids and crystal-clear highs.
  • hand-made by highly skilled engineers in Germany
  • combines Astell&Kern's philosophy of "providing the original sound" with the expertise of beyerdynamic and sets a new benchmark.

AK T8iE vs. AK T8iE MkII



High-grade voice-coil

New, improved voice-coil

highest reliability / extremely low distortion

easier movement of diaphragm at high volume levels

Premium copper cable

High-grade transparent silver-plated cable

high purity silver,copper alloy conductors for the purest sound

aramid fiber core for ultimate strength / skin friendly, ultra flexible transparent sleeve

Gold-plated MMCX connectors

High precision gold-plated MMCX connectors

perfectly fitting components / highest reliability

lowest resistance for best audio performance

Internal Structure

Astell & Kern AK T8ie MKii earphones - internal structure

New, improved voice-coil

AK T8ie Mk2 voice coil image

The AK T8iE MkⅡ introduces a brand new voice-coil for a superb listening experience, drawing on all the heritage and audio excellence beyerdynamic has pioneered since 1924.
Keeping the perfectly tuned acoustic signature of the AK T8iE, the new voice-coil increases reliability and lowers distortion to a minimum.
Each voice coil is carefully inspected and adjusted by hand, using a digital microscope camera with 40x magnification.


High-grade transparent silver-plated cables

The AK T8iE MkⅡ is supplied with high-grade silver-plated fiber cables with coaxial construction, a strong upgrade from standard copper cables. To ensure highest wearing comfort, the cables are skin-friendly and ultra flexible. The transparent sleeve effectively reduces cable noise. All conductors are made from high purity silver/copper alloy (Ag–Cu–alloy) for the purest sound. The cable material is specially fabricated for the new AK T8iE MkⅡ. 
For ultimate strength, the cables are reinforced with high tension aramid fiber cores.

AK T8ie MKii earphones cable design

High precision gold-plated MMCX connectors

The high precision MMCX system consists of tolerated, perfectly fitting components including: plugs, sockets and toothed washers.
Low electrical resistance prorides the best audio performance possible. High reliability for daily use.

Great flexibility

Besides the standard 1.3m cable with the general-purpose 3.5mm plug there is an additional balanced cable for Astell&Kern devices(works with AK70 / AK100 Ⅱ / 
AK120 Ⅱ / AK240 / AK300 / AK320 / AK380). It provides a balance output with its specific 2.5 mm 4-pole terminal. A leather case stores the in-ears safely for transport.


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Additional Info



Transducer type Dynamic, moving-coil
Operating principle closed
Frequency response 8 – 48,000 Hz
Impedance 16 Ohm
Total harmonic distortion <0.2 %
Power handling capacity 10 mW
Nominal sound pressure level 109 dB SPL
Sound coupling to the ear intra-aural
Cables two cables: one for balanced-mode use, one for unbalanced-use 1.30 m, two-sided, detachable
Connector MMCX at earphones/ 3.5 mm 3-pole jack plug on unbalanced cable / 2.5 mm 4-pole jack plug on balanced cable
Weight without cable 7 g per pair


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