hey guys ive been looking around to try to figure out how to build a box and i went to use RE calculator but i was told thier calculations are off. so i figured that it would be better if i find someone that knows how to design one. I have a 1989 ford probe. I bought a 18in Fi BL at dual 1ohm and i have a jbl gto 1201.1 running at 1117 watts rms at 2ohm. i bought a FMOD subsonic filter thats set at 30 herts so im looking for the box to be tuned at 32 hertz. My trunks demnsions are 37" is the width 32.5" is the depth 16.5" is the height i also need to have the amp mounted on the box on the top for it to fit. heres a pic of the trunk http://i796.photobucket.com/albums/yy250/diegoksslr/PIC-0069.jpg