You should be able to connect two speaker cables from the Marantz speaker out 1 and out 2 and connect one set to the upper posts and the other to the lower posts of the speakers. As long as your Marantz can turn on both speaker one and two at the same time, it should work. Not sure if this will yield any change in sound, I personally would not bother. Your speakers are 8 Ohm and only 88db efficient, not a high efficient load but should be OK.
