ive got dimensions, i need a box!

[pimpedout97x 4]

alright. ive got the dimensions. i have 2 options of building this. its kind of going to be trial and error until i find the right height i want the desk to be, but here it goes.

the box needs to be 4.5 cubes each (2 seperate boxes) and tuning...im guessing like 20ish or 24hz or something? 95% of the time its for rap music. once in a blue moon i may watch a movie on it. but for the most part, i want it to sound best on rap music.

the dimensions im working with are 39" x 37" (width and length)

using those 2 dimensions, i need to see how high it will be to make 4.5 cubes after determining the tuning and port length, etc. if i like the height, ill build the box using that width and height.

can anyone help me? the sub will be down firing, as far as the port, i dont know if i should down fire that, or what....

VJ