Did some more listening tests. I now believe that my ears simply aren't golden enough to tell which is A or B! With some recordings, "down" sounds more like what the written description of what "A" is. And on others, "up" sounds like "A".
I think overall I prefer "down" as it seems to have more air.
It's odd. This is all from CD. On the Grateful Dead Spring 1990 (24/192 FLAC) of 3/29/90 Nassau (a very revered night with Branford Marsalis), when I put it "down", the bass filled in much more than "up".
But then on Ayo's "Joyful" (24/96 WAV), a very rich and bass heavy album, I thought "up" had more bass, which contradicts the Grateful Dead findings.
Thus I'm really not sure whether A or B is up or down. And I'm less confident of my ability to discern which setting sounds like which EQ description.
Which all leads to the inevitable audiophile end that I'm equal parts audio enthusiast and neurotic nut job worrying about things that might not be real to begin with!
I think I'm burdened by the notion, and perhaps confusion, that after reading the EQ descriptions, I'm certain that "A" is the one for me. But when I actually play music, I usually prefer "down", which makes it "B", but because my mind says I'm going to like "A" but I end up liking "B", that means that "B" must actually be "A" and it's wired incorrectly.
Welcome to my world.
But ultimately I don't know enough about audio engineering to definitively say if it's not wired correctly. I can more easily say that I'm not wired correctly, Doh!