I am looking into buying the Genz Benz 4x10 and I'm unsure which OHM setting to choose, 4 or 8. I am also looking into the GBE600 head as well, so assuming that's what I am getting which OHM setting would be best? If I am thinking right, 4 ohms would allow for more watts but I'm not sure if that would be best for that head or not. Help me out!!