The raD is a rugged portable speaker that also does multi-room audio

While Sonos has long been known as the king of multi-room audio setups, Mass Fidelity's Core system, which came out about a year ago, has been making a play for the crown. The Core tries to compete by offering good sound quality and a simple, "One-Button Connect" option for linking multiple speakers with a separate, dedicated network to connect devices.Now it's back with a new speaker in the line, the raD. While the original $599 Core was meant more as an at-home speaker (despite also having a b