After a bruising year, Sonos readies its next big thing: a streaming box

After the most tumultuous nine months in Sonos’ history, the brand is trying to find its footing again. Even as work continues to rehabilitate the company’s beleaguered mobile app, Sonos is planning to take a big swing in a new product category: it’s getting into video for the first time. In the coming months, Sonos will release a streaming player that sources tell me could cost between $200 and $400 — a truly staggering price for its category.

I’ve seen images of the upcoming…