Comment Re:Then all of Manhattan is walking dead? (Score 3, Informative) 212
Infrasound can behave in strange ways. Hearing it from a mile and a half away is not even unusual. I remember trying to track a sound I was hearing through the living room wall. I walked 5 blocks in what I thought was the general direction, and the sound waxed and waned as I walked. I finally gave up. I found out the next day that there was a rock concert the previous night. About 2 miles away. Across the river.
The problem is compounded by the common use of dBA in noise ordinances. dBA discards sound lower than 20 Hertz.
Also, you can't block it out, except maybe with an acoustic metamaterial. Loud infrasound and near-infrasound is torture.