This is absolutely not true for the miniaturized balanced armature drivers that this MEMS speaker design is competing with. The coil must be wound in-situ and

This is absolutely not true for the miniaturized balanced armature drivers that this MEMS speaker design is competing with. The coil must be wound in-situ and is usually epoxy potted due to fragility. https://navcomm.eu/img/cms/BA%20opis.jpg https://navcomm.eu/img/cms/BA%20opis.jpg