Sonos filed for an initial public offering on Friday amidst an ongoing business transformation that will test its mettle against tech’s biggest names. The long-anticipated move comes as the stereo company has been upgrading its speaker lineup with voice functionality and other smart-home capabilities as part of a plan to make its devices central hubs… https://www.adweek.com/digital/sonos-future-is-at-the-mercy-of-tech-giants-as-it-heads-into-ipo/