When my eyes started crossing I figured it was a good time to take a break. I grabbed four 1x6s and ran them through the jointer, both sides. They were all concave. So the infeed definitely drops down, going away from the cutterhead.
I'm trying to figure out what I paid for with that $5K. "Here's your brand new Hammer JP. Now fix it. If you ask the right questions we might send you directions." Nice.