ok thanx for the info thats about what we were workin on i just wanted to be sure cuz i see in the meade builds area the pics of the 4 re 18"s in a truck took up the whole rear area were the 3rd row was and to the back , but since mine will be the same type but with 2 18"s , i figured maybe it can use half the space...but somehow i think that box he made may be smaller than whats recommended for 4 18"s? unless he used 5 cubes per sub total 20 cubes for 4 subs because the rec specs are 5-10 cubes per sub so i figured i can get away with a box thats 10 cubes after displacement and push 5000 - 6500 w rms into it should make it bank like steves window shaker ! i also have 4 yellowtops and a 250amp alt all 0 ga wire too and three other amps for assorted mids midbass and tweets........