Astell&Kern Billie Jean Earphones

Astell&Kern Billie Jean Earphones


Billie Jean Earphones by Jerry Harvey Audio.

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This One's for You, Billie Jean

Billie Jean is the latest collaboration of In-Ear-Monitors (IEMs) between Astell&Kern and Jerry Harvey Audio which feature a new Dual Balanced Armature (BA) driver system. It is another winning product created by combining the experience and know-how of Jerry Harvey's IEM design and the quality production of Astell&Kern.

Billie Jean brings to life a real audio experience that will take your music to the next level.

Utilising our experience of producing the award-winning SIREN Series IEMs, which is loved by music enthusiasts around the world, we were able to achieve a new level of accomplishment for those who enjoy a genuine music experience.

Billie Jean features the patented freqphase™ technology from Jerry Harvey Audio with a new internal sound bore design to bring clear and impeccably balanced sound from sub-bass to brilliance range. The new IEM shell has been optimised to fit nicely in the ear, utilises a 2-Way 2-BA design, Silver Tinsel cable, compact package. The result is a brilliant pair of IEMs designed and built by Jerry Harvey, the inventor of custom-IEMs, and Astell&Kern, the global leader in Hi-Fi audio.

Meet Billie Jean, the first dual driver Universal fit IEM from Astell&Kern and Jerry Harvey Audio. The Billie Jean IEM features Jerry's iconic Rock 'n Roll sound; a well-balanced and wide soundstage, incomparable dynamic range and Jerry Harvey Audio’s patented Freqphase™ technology make this an IEM not to be missed. Billie Jean is the perfect match to compliment any Astell&Kern player.

Billie Jean Technology


Jerry Harvey Audio has developed a whole new Balanced Armature Driver to offer reference quality IEMs for mastering and mixing works. The high-range drivers are designed to deliver everything with minimum distortion, while the ultimate mid driver offers perfect, flat sound from 10Hz to 5kHz.

The bass driver was designed for an even steeper low-pass effect with no distortion.


Most Multiple Driver IEM's suffer from phase and timing issues. Low, Mid, and High drivers all have different impulse times. The higher it is, the faster the impulse time of the BA Driver. The lower it is, the slower the response speed. This causes improper arrival times and Phase shifts.

The "Billie Jean" applies Jerry Harvey Audio's patented "Freqphase" technology, which uses precisely cut tube lengths for each driver to minimise the phase shift of each frequency. This allows for the High, Mid, and Low drivers to be aligned to 1/100ms for the most ideal phase curve. It ensures the correct time alignment and phase of all drivers resulting the most accurate music reproduction in the industry.

Watch the video (opens in a new window).

2-Way 2-BA Drivers

The Balanced Armature drivers used in Billie Jean are a customised BA only available from Jerry Harvey Audio and is designed to bring more power with less weight. Billie Jean will surprise you with efficient, yet powerful sound.

Jerry Harvey Audio's Freqphase™, Timephase, and Waveguide technologies allow this 2-Way 2-BA IEM to deliver the full range of audio performance anytime. The special Acoustic Chamber Sound Bore design has been carefully crafted to bring a wide soundstage with incomparable dynamic range, without adding any interference.

Shaped for a Precise Fit

Its design has been optimised after a series of studies of different shapes of ear canals from both men and women of different ages.

It fits and sits perfectly in your ears without bulkiness.

The Universal Fit Billie Jean is the perfect companion for Pro Audio applications such as sound monitoring. With the noise isolation design and the IEM know-how from Jerry Harvey Audio, you will get the best fit and comfort while you enjoy your tunes in a new way.

Silver Tinsel Cable with detachable 2pin connector

The cable used in the Billie Jean is not simply a copper cable. Instead, it is a copper cable plated with silver.

The cable is manufactured by first compressing the silver plated copper wire, which is then flattened and rolled into a steady interval that is then used to wrap around the Kevlar(or Zxoin & Technora). This newly developed cable has astounding tensile strength and delivers the full dynamic range of music. Kevlar fiber is used for 3.5mm unbalanced bundle cable and Zxoin and Technora fiber for 2.5mm balanced cable.

Conventional straight cables do not handle the frequent bending of cables and often short out. The intertwined cable disperses the stress to the cable and offers better resilience. It's also easier to wear around the outer ears as the cable shape can be easily adjusted for the best fit.


The brand name of Aramid fiber that DuPont USA manufactured.

It is very lightweight and more durable than nylon, and has the advantage of being very tough. Because it is made of light weight organic polymers such as carbon, nitrogen and hydrogen, allowing it to be 5 times more stronger than steel. Kevlar is particularly strong against friction and is commonly used for body armour and aircraft tires due to its excellent shock absorption.


Zxion, a patented technology from VICTOR in Japan, is a polyester-crystalline fiber that can transmit signals more reliable.

Technora is a para-aramid fiber autonomously developed by Teijin in Japan. It has a tensile strength about 8 times higher than steel of the same weight and mainly used for parachute.


  • Model Billie Jean

  • Body Colour Red / Blue / Purple

  • Type Universal fit IEM

  • Driver Unit 2way 2Drivers (High, Full Range(Mid & Low)) / 2BA per side

  • Impedance 18 ohm

  • Noise Isolation -26dB

  • Sound Technology Freqphase™ Time | Phase Waveguide / New Sound Bore

  • Components 3.5mm Unbalanced Cable (0.75mm 2-Pin),

  • 3Sizes of Silicon Ear tips (S,M,L), Carrying Case