Sonos Sonos sells a special adapter for $19 that you need to use (along with an aux dongle) to hardwire your computer to either the Era 100 or Era 300. Sonos From here, you just need to hardwire one ...

Connect the Sonos speaker to your computer via a 3.5mm to 3.5mm dongle. (The Era 100 and Era 300 also require you to have Sonos’s adapter.) Select the Sonos speaker as your computer’s default speaker ...