In-Ceiling By Sonance - Architectural Speakers for ambient listening from anywhere in the room.. Power up to three pairs of Sonos by Sonance Architectural speakers with a single Sonos Amp for even more sound coverage. Optimized for Sonos Amp, these In-Ceiling speakers offer crystal clear sound custom tuned with Trueplay. When paired with Amp, these speakers unlock all benefits of Sonos system including easy to use app that works with all your favorite streaming services, AirPlay control, regular software updates that improve your listening. Individual Dimensions are 9.13 X 4.84. Sold in Pairs.