IDK. The mic is built into the unit so there is no way to reposition it. I would guess that it is +/- 3-5db's. Really, its only sensible use is if you build a new box, reposition your subs, get new subs, ect., you will be able to tell if its louder and rougly how much louder. Its definitely more for show/comsumer appeal then for a realworld application.