The Sonos Boost is designed for homeowners whose existing Sonos system is struggling with a slow, congested or unreliable home WiFi network. It suits properties where several Sonos speakers are in use, or where the router is far from where speakers are placed.
By creating a dedicated wireless network just for Sonos, it's well suited to anyone experiencing dropouts, lag or unreliable playback rather than needing more speakers or amplification.
It's a straightforward, low-cost fix for connectivity issues in an existing multi-room Sonos system, rather than a speaker or source component in its own right.