There are specialist multi-channel amplifiers which can power multiple rooms (or zones), however popular streaming amplifiers like the Sonos Amp are stereo amplifiers which are only designed to drive a single zone. Sonos, and similar systems, are modular multiroom audio products which means that you need one device for each room. In some circumstances you can use a single amplifier plus a speaker switch to drive two zones, for example a bedroom/en-suite. But a speaker switch simply provides on/off control of speakers, so you cannot have different content playing at the same time or adjust the volume independently.