The Biz: Asahi-Kasei and ESSTech go to war over mobile superiority

There's no question that, over the past three years, ESSTech has completely dominated the premium portable digital audio segment. The fab-less circuit design firm kicked things off in 2014 with the introduction of the now-ubiquitous ES9018-2M, a mobile-minded DAC chip designed as a two-channel die shrink of the venerated 8-channel ES9018S (itself the evolved production …

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