The AK Zero1 is rated at 16Ω@1KHz impedance, features three drivers per earpiece, and promises a "ground-breaking hybrid sound". Perhaps most interestingly, the AK Zero1 includes a specially developed micro rectangular planar dynamic driver, which is known to be tricky to scale down for use in an in-ear monitor. Additionally, there is a vibration panel boasting a high-polymer and thin metal film. Finally, the midband and vocal range are handled by dual balanced armature (BA) drivers using custom-designed coils with the lows produced by a 5.6mm dynamic driver resulting in a quoted 25Hz–30KHz frequency response and 96dB@1KHz (1mW) SPL.

This array of drivers is then carefully placed in the optimal position and enclosed in specifically designed acoustic chambers manufactured with 3D printing technology within a CNC-machined metal housing.

Astell&Kern's unmistakably angular aesthetics are apparent with the AK Zero1's housings treated to premium reflective cut metal surfaces. These would look great beside an equally angular A&K player.

Also bundled in with the earphones is a hi-fi-grade OFC cable crafted with high-purity silver plating and copper and terminated with aluminium plugs to maintain the audio signal's transparency, says A&K.

MMCX connectors promise a top-quality connection between the earpiece housing and cable. However, if you want to upgrade the supplied cable, there's an optional 4.4mm MMCX cable accessory: the PEP11. This sports larger aluminium-machined 4.4mm plugs in addition to the high-purity silver plating and copper cable.

To ensure the best fit, the slender ear nozzles come with five different-sized pairs of silicone ear tips and one set of foam. You also get a neat carry case.

The Astell&Kern AK Zero1 IEM is priced £649/ €749, and the Astell & Kern PEP11 cable, £119/ €139. Both are available from November.

Vist Astell&Kerm for more information