The Marantz sr7013 has 9 channels of amplification & is a complete 9.2 channel surround processor.First I would ask why add an external surround processor to this?
IF you must use separates you will need an external amplifier as well,the Marantz can be used as a PreAmp/Surround processor BUT NO capability to use the amplification section only(which would be labeled as "9.2 CH Amp IN"I believe...