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Astell&Kern

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Billie Jean

by Jerry Harvey Audio

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.
Utilizing 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 optimized to fit nicely in the ear, utilizes a 2-Way 2-BA design, Silver Tinsel cable and L-type plug in a small, 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.

by Jerry Harvey

Billie Jean Technology

THE SIREN SERIES

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.

Freqphase™ Time | Phase Waveguide

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 minimize 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 VOD

2-Way 2-BA Drivers

The Balanced Armature drivers used in Billie Jean are a customized 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.

We highly recommend you try Billie Jean with your favorite tunes, which will never sound the same again.

Exploded view of structure

Full Range Driver
(Mid & Low)
High Driver Freqphase™ Time |
Phase Waveguide
All new Acoustic Chamber
sound bore design

Shaped for a Precise Fit

Billie Jean is over 30% smaller compared to Michelle Limited.
Its design has been optimized 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.

Michelle Limited Body Billie Jean Body

Silver Tinsel Cable with detachable 2pin connector

The cable used in the Billie Jean is not common copper. 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. This newly developed cable has astounding tensile strength and delivers the full dynamic range of music.  There is a 3.5mm Unbalanced cable provided.

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.

Kevlar

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 armor and aircraft tires due to its excellent shock absorption.

Kevlar
Silver & Copper plated spiral

Specification

General Specifications
Model
Billie Jean
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, 3Sizes of Silicon Ear tips (S,M,L), Carrying Case