HELLO?

Is there no room in the middle of the dance floor for a riser / dance platform / custom built sub enclosure?

If it's not the right environment for this type of thing, then you can never do it.

If you CAN do this. You can get very far with some books, skills, tools, Heavy MDF, Plywood, insulation, a couple of 15" or 18" MTX's and 600-1000+ watts out of a crown amp.

An old school solution that's been sucessfully used in privately owned clubs for decades.

If you follow the formulas and put in a hard days work. You can even impress yourself.