Thread: Suppressor effectiveness - Think about this!

So recently some sound testing was carried out, I can't say much about the specifics but this is what happened:

Properly calibrated sound test equipment was set up by a qualified person 450 meters to the side of the firing point i.e. at right angles to the line of fire.

Shots were fired with a variety of rifles, a 7.62x51 target rifle, a 223 heavy barrel rifle and a 6.5 creedmoor suppressed rifle.

The loudest noise recorded from the shots was 52 decibels, what would you think the "quietest" shots registered at (bearing in mind decibels are a measure of power or intensity so its not a linear scale)??