Summary: Purchased this to drive a set of Bose Free Space® 51 environmental speakers out by the pool. As with all Sonos devices, setup was a breeze and was up and running in minutes. This unit comes with 2 channels at 55 watts per channel. unfortunately, that just wasn't enough to drive the speakers. The unit itself is a good unit for smaller speakers. I am returning this and getting a Yamaha 100W per channel amp and the Sonos Connect.