whatts up.... i currentley have 2 mtx 9500 15"s in a 9.5cu ft ported box. At my first competition i hit 155.1dB@ 43hz. Im looking to get a little louder. i have tried 3 diffrent boxes tuned to diffrent frequencies to get more spl but my first box seems to do the trick. im thinking of taking the exact same box design, and making a wall of it so the volume, port is exactley te same. what do you guys think?