When Sonos released its first portable speaker, the Move, four years ago, it was an anomaly. Previously, the company had looked down on Bluetooth as low-quality and unreliable, and all of the speakers it sold required a power outlet. The Move, on the o…

It’s been almost exactly four years since Sonos first introduced the Move, the company’s first portable speaker. The Move was a solid speaker when it was first introduced, but in the years that have passed, things like its lower-than-average battery li…