A zone, is a group of speakers that work together, plays at the same time and runs the same volume level. If you purchased one of our bundles; the two speakers and the bass module, then that would be considered a zone.
You can have multiple zones, you might have speakers in the living room, speakers in the kitchen or bedroom. We encourage each zone be a 2.1 surround system meaning you have the two speakers and our bass module. But if you only have one of our speakers, that is considered a zone as well.