To effectively measure the sound signatures of various Brakes or Suppressors they need to be fired in the same place, time & on the same rifle using the same ammunition, with a calibrated control.
Different weather & surrounding will have an impact on the comparative noise levels.
I have a friend who has done just that because he wanted the "best" suppressors.
It cost him a ridiculous amount of money for the software & hardware for his gear, the mic alone was on the wrong side of $7K![]()
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