Noise level at festival?

Question

A music festival I will be attending is reducing noise levels from 140db to 137db. There is a huge debate about this and if it will make much difference. Can somebody explain, get as scientific as you like

Answer 1

hmm i also do not know exactly.. as i know for the indoor with annoyance, speech interference its more than 50 db, and for outdoor with seriously annoyance its more than 55 db.

i just know that:  if a 40 dB noise level is all a person can tolerate, and if the intensity of the comfortable speech is 55 dB, then the ANL is 15 dB (55 dB minus 40).  The more noise a person can tolerate the smaller the ANL. If this same subject could tolerate 50 dB of noise rather than 40 dB, then the ANL ( acceptable noise level) would be 5 dB (55 dB minus 50 dB)

this might be help:

http://www.engineeringtoolbox.com/decibe...

http://www.audiology.org/NR/rdonlyres/56...