If you have the time you could get louder. If it were me I would start with subs firing back 5in off the trunk lid and port to the side 3in off passenger side and move it an 1/8th away from the side until I quit getting higher numbers and tape where the box was and the number posted. The trick is having the front and back wave hit the mic at the same time. I still don't understand it all, for the most part it's trial and error.