Newbie Looking at picking up a Sansui QRX-6001

[Biglos]

Hey guys, first off thanks for letting me on the site much appreciated! Anyways recently i started building my first system, although it is complete i saw this Sansui for sale locally to me and i'm very intrigued. Unfortunately for how small my room is atm I don't have room to setup this with 4 speakers but this is a receiver id love to have forever and eventually setup in my own living room someday, but i have some questions for now. so far from what i can tell it is possible to setup as a 2 channel system is that true? also for the speakers there is system A and system B and a 4 channel front and 4 channel back input, what does that exactly mean? does it mean you can use this as like 2 different systems? sorry for these questions but any info would be very appreciated