Well, forgive me Lord, for I have sinned. I don't know my gear inside out, like I said, I just plug in and play, BUT, I am here and trying to learn about this stuff, so your info is greatly appreciated. To continue with the silly questions, if I was running 2 heads, I would obviously have my cab set to stereo, but what would the setting on the back of my amp need to be, considering I have only 4 ohm and 16 ohm choices?