dooner i took some pictuers that might help you out alot..
i also am doing a semi-speaker grow, dont really know the specs of the box, but its got plenty of growing room before you might need to start thinking about combining two of the same speaker boxes or building one yourself.. or if you have money buy a box or something..

but anyway heres my setup, very simple, on the opposit end of a pro.. but shit it works.. i only have 2 42watt cfl's (more to come) and using the dull side of some foil to reflect the loss of light inside a wooden box (wood doesnt do too well in reflecting light, looks more like it absorbs it) but anyway one thing ive learned about growing, the most important thing to me is planning ahead.. heres my pics, goodluck

one more thing: do your research, then ask questions..