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.

Billie Jean features the patented freqphase™ technology from Jerry Harvey Audio with a new internal sound bore design.

The new IEM shell has been optimised to fit well in the ear, utilises a 2-Way 2-BA design, Silver Tinsel cable and L-type plug. It is available for pre-order at 349$ and is the new entry level product for the Siren Series.

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