I am going to run an Ed Nine.1 @ 2 ohms putting out 900x1 and a Nine.2 putting out 100x2 @ 4 ohms. Can I get away with running 4 gauge wire for the whole thing if i dont plan to upgrade?
Since the n1ne.1 is a 1ohm nominal amp, I imagine sometime in the future you will use it there, THEN, the 4awg you are using right now will not be sufficient. I would recommend with that power running 0/1awg. Also, the wattage really has nothing to do with what awg wire you should use, unless you give us a few other details. What you need to know is the max current draw of the two amps together.