I only did the listening position and stopped because I was following the directions under part G."calibrate the subwoofer volume" where it states "3. After the first measurement process is complete, select "Calculate", then "Save" or "Store", then go to "Check Parameters"". I had planned on doing six positions spaced out 2 feet identical to the diagram but stopped because of the low subwoofer output as I didn't know if the ground loop hum could cause it, and I had to wait another day for my father or a friend to help me locate the problem. One thing that I haven't tried is loosening the screw (or whatever it is you do) on the back of my EP500.
