Reverse Engineer a speaker crossover
I checked your link, but stopped reading when I reached a picture of the bass reflex vents. They are way too long. Also the drivers look very expensive. But it will sound like crap because the vents are way too long, so they will resonate like organ pipes. This hints at the designer having no clue what he's doing. 

I'd advise building the classic:

http://www.diyaudio.com/forums/class-d/104402-boominator-stab-ultimate-party-machine.html