Designed and tuned in collaboration with Sonance, these speakers offer natural, room-filling sound with discreet installation. Available in 6-inch or 8-inch sizes. Sold as a pair. Passive speakers must be powered by an amplifier (sold separately). Powering these speakers with Sonos Amp (sold separately) unlocks Trueplay in the Sonos app. This technology measures how sound reflects off walls, furnishings, and other surfaces, then tunes your speakers for the best possible listening experience.