To commemorate its IPO today, speaker company Sonos recreated the Nasdaq bell that opens each trading day. By the time the closing bell rang, Sonos closed up more than 32 percent. The long-anticipated IPO comes as Sonos upgrades its speaker lineup to compete with the likes of Google, Amazon and Apple. Sonos hopes its legacy of excellent sounding speakers will set it apart from those digital giants. Here, we take a look at the history of the smart speaker-maker and what it’s banking on to deliver a booming future.