The basement was interesting. We had EMF readings all over the place, and the corner where the activity was centered had power strips and electrical cords strung overhead. I also believe that the area was directly underneath the entertainment center in the living room upstairs, which added to the EMF influence.
I did notice a low frequency, on the order of 1 to 2 Hz, vibration or oscillation coming from somewhere while I was in the basement. I believe this to have been a "beat note" created by two identical window air conditioners running in the windows of two upper floor rooms in the house, running almost - but not quite - in sync, and transmitted through the walls of the structure. There have been theories put forth on the psychological effects of infrasound frequencies, and how certain frequency ranges can create hallucinations of being haunted (see Low Frequency Illusions
(link) ). It is possible that this low frequency oscillation, maybe in conjunction with the EMF fields present, may have been responsible for some of the events experienced in the basement.