The media feed is the made through the material selection you make when you load the material (on the actual printer).
It determines the head height, roll direction, and the "feed speed/length/advance".
Even after you get it happy it seems like you have to re-calibrate it every few months once you notice banding or it looks blurry.
Thankfully the auto-calibration works wonderful and you're going again in 5 minutes.
We only use a couple different "medias" set up in our printers and everything looks great.
We made our own profiles and everything is so much better. It isn't all that hard to do with our rip (Onyx) if you have a reader.