Chapter 5: The Commercialization and Advancements The evolution of in-ear monitors (IEMs) took a significant turn in Chapter 5, as custom-fit IEMs entered the mainstream, making precision audio experiences accessible to both professionals and audiophiles. The commercialization of these tailored solutions marked a pivotal moment in the history of IEMs, setting the stage for further technological advancements that would redefine the landscape of personal audio. Commercialization of Custom-Fit IEMs With the demand for personalized audio...