well we first got to figure out how u miscalculated in the first place in order to give u an exact number to cut off. so tell me how many braces and the length and width of each brace, also the outside measurements of ur box so i can try to figure out how much space u really have more than likely u forgot to account for bracing subs and other stuff that takes up space which could have thrown the tunning off. so help us out with more info please