Many Rotel receivers and processors support up to 4 independet rooms (or zones) of audio. To expand beyond the main room, you will need at least one additional amplifier such as the RMB-1506 or RMB-1512 to power the extra speakers.

Also, if you are only running a 5.1 speaker system with the RSX-1560 or RSX-1562, the additional 2 channels of the built in amplifiers on this model can be redirected to power one of the additional zones in the system.