Space saving and super loud both inside and outside eh. Pixie dust subs with leprechaun amplifier, then just drop some lsd and it'll pound all day long.
Most party goer's I knew that had a system would just open the front doors of their SUV with a couple of 15's in the back and crank it up. All that's important is that the chicks have something to dance to, the more they dance, the more they drink. Doesn't take much to provide some party music unless you're just out to annoy any nearby neighbors or beach goer's as well perhaps. We also used to have pool parties by dragging the house system along with it's tower speakers outside on the deck.