Nice recent article from JS on OHM site in his blog. It describes how to use the 4 level adjustments on each 5XXX model OHM. My F5s have these and these controls have been gold for getting things tuned in just right in my rooms. I kinda figured out their effects over time but nice to have "the man" describe the intent. A very unique feature that is pretty fundamental really. Blasphemy having "equalizer" controls on a speaker though in some parts I suppose but to me it just makes sense and in fact works.
http://ohmspeaker.com/news/making-the-sound-fit-the-room/
http://ohmspeaker.com/news/making-the-sound-fit-the-room/