The AC series of speakers are enclosed weather-proof speakers that are meant to be surface mounted to wherever you can stick them. The AC for all those who don’t know, stands for All Climate. The speakers are manufactured in one of the harshest climates in the US, Maine. So they can pretty much guarantee that they will work in any weather.
The speakers implement a Wide-Fi technology that allows one loudspeaker to output both channels of audio. Implementing multiple Wide-Fi speakers only increases the audio quality.