Try using a real decimeter. It works the same as this app only can cost up to $100. The closer you are to the source the louder it will be. So if a band from 50 yards reads 100db. Dont be surprised when your talking voice is the same at 2 inches. Do a little research before you post negative comments. I am a sound engineer. This app works nearly as well as many decimeters do.
TheStoke about Decibel Ultra