As an afterthought, one of the things that helped our club keep the older field for so many years, besides being willing to work with the neighbors when there was a complaint, was that the city in which we had the field had a 65dba at the nearest point to the complaintants property line. We bought a sound level meter, did some tests with several models, estalished that the worst sound level we generated in worst case was 67 dba. We ended up rotating the field about 8 degrees, got our sound level at the P.L. to 64, changed our starting time from 8:00 AM to 9:00 AM, and had no more complaints.
Also, we determined some major fuel for the fire we extinguished there was a couple hotheads with chips on their shoulders who "weren't going to be pushed around!" It was almost harder to control them than to make the adjustment.