You don't want the party to just hear the music. You want them to feel it. You want the music to move the people...almost literally. Your 12" woofers are going to be found wanting. 15" woofers do a lot better, but if you really want to drive the music home, you need to put at least one subwoofer in your system.
The sole responsibilty of a subwoofer is to drive the bottom end home. The dance music lives in that bottom end and the subwoofer takes that low end and makes it clear to even the most rhythm challenged person where two and four are.
Depending on how much bass you want to add, there are lots of options for you as a professional DJ. We carry powered and passive subwoofers that let you bring exactly what you need. And we stand behind every subwoofer we sell so you know that whether it's the manufacturer warranty you use, our repair technicians, or you need to return a bad subwoofer, you'll have Midwest Pro Sound and Lighting behind you every step of the way.
All prices are in USD.