What do I need to run additional zone speakers off the RSX-1550, RSX-1560, or RSP-1570?
If you are only running a 5.1 speaker system with the RSX-1560, 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. Otherwise, you will need an additional multizone amplifier such as RMB-1506 or RMB-1512 to power the additional zones.