Excuse me...I didnt clarify myself......windows down. and the mic placed @ a certain distance from the window.....I use to own a competition company called THE COMPETITIVE EDGE....in the late 90s and early 2000s...we ran a class called GHETTO SPL , and by the way the record was held for 3 years by tommy with HO PROBLEMS ( unbeaten bass boxing world champion ) He would meter a 154 on the outside of the window.....and 165 db inside closed up....STILL AMAZING......