The wind industry’s standard setback of 1500 feet is only based on the height and structure of the tower in case of “blade throw.”
One turbine emits at its source about 97 decibels several hundred feet above the ground. This is as loud as a DC-9 aircraft. Multiply this by how many turbines are in a wind farm.
The revised ordinance introduces this noise as a reason for its setback; that the normal outdoor background sound level of a proposed site be the starting point for determining the distance between one turbine and a home.