Over the years, Sonos has weathered competition from better known rivals like Apple and Bose to find a devoted audience among audio enthusiasts. But lately its wireless speaker has lost ground to an unexpected competitor, Amazon’s Echo [backed by royalty deadbeat Jeff Bezos].

Now it faces another challenge: a change in the corner office. After 14 years leading the company he helped found, John MacFarlane has resigned as chief executive of Sonos and has been replaced by one of his deputies, Patrick Spence.

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