It is very kind on the part of Chetanji to go searching for the location of the LS to help out the lady.
Any violation of the NP rules between 10pm to 6am is a direct violation and the equipment must be seized and the violators punished under the EP Act, there is no question of measuring the decibels.
It
is a difficult task for the police(the one's who are honest) to go
searching for the location; many times they simply say they cannot hear
anything. This may be possible if they are in a police car with their AC
on and windows closed. In rural areas, it is much more difficult as
they may have to go through agricultural fields , kaccha roads or forest
type of areas with no street lighting etc. to search for the location.
Therefore , to tackle such noise cases drones must be provided to the police and sound monitoring sensors and GPS location sensors will need to be mounted on these drones.
On
a quiet day or night with minimal env. noise, large box type
and horn type LS's(typically all these produce more than 100dB/1W at 1
metre away) can be heard distinctly (even if only at between 40-50dB) abt.
1 km away air distance(by road this may be more due to no direct
route). The dub-dub-dub of the bass is even more distinct and does cause sleep disturbance.
PFA excel sheet calculation of dB vs distance. There are 2 sheets that use different formulae from 2 different websites.
It is necessary for Noise complaints to be recorded as "Noise" complaints by the police and other authorities. As of now, the police have NO OFFICIAL records of noise complaints(from what i have experienced of Maharashtra and Karnataka).