nad c 658

can you hook up another power amp in the future with this unit or would you have to get a additional preamp? I have elac uni 5 floor speakers and a nad 150 watt power amp
Depends. Its got one set of RCA pre out, and one set of balanced XLR pre out, and one set of sub out. Do you not understand how these work?
could you use a spliter on the preout?