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Rapper-founded headphone and speaker brands are far beyond a novel concept. Beats by Dre was doctored up by, as the name suggests, "The Next Episode" artist Dr. Dre (alongside music executive Jimmy Iovine), while Raycon, a frequent YouTube sponsor that made our list of the many cheap headphone brands ranked from worst to best , was conceived by "One Wish" singer Ray J. However, not all artist-owned audio device brands are immediate household names, to the point where even a rapper's biggest fans might be shocked to realize their favorite musician dabbled in the tech market.…